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Stellar population analysis of the red and blue galaxies in the distant cluster Abell 370

Jablonka, Pascale; Alloin, Danielle Marie; Bica, Eduardo Luiz Damiani
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Artigo de Revista Científica Formato: application/pdf
ENG
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In this paper, we apply a population synthesis method based on star cluster integrated spectral properties to members of the distant galaxy cluster Abell 370. Within boxes defined from magnitude vs colour diagrams, we have co-added the data corresponding to members with similar spectral characteristics, in order to achieve a signal to noise ratio suitable for the synthesis. Population synthesis of the two blue averaged objects provides the flux and mass fractions of the young components responsible for their blue colours. These are the disc component in late spiral galaxies for one group and a recent starburst for the other group. Population synthesis of the three red averaged objects confirms that no cosmological evolutionary effects are observed in this cluster at z = 0.374. In ali three cases, we find a metallicity enrichment lower than that expected on the basis of the metallicity vs luminosity relationship found for the central regions of nearby galaxies. For the less luminous objects, which correspond to present-day massive elliptical galaxies, this reflects the contamination by light from their metal-poor halo population, as a result of Abell 370 distance. For the more luminous objects, which correspond rather to cD and extremely massive galaxies...

Carcinoma da Próstata. Análise Retrospectiva de 370 casos

Matos Ferreira, A; Rangel, A; Barreto, J
Fonte: Centro Editor e Livreiro da Ordem dos Médicos Publicador: Centro Editor e Livreiro da Ordem dos Médicos
Tipo: Artigo de Revista Científica
Publicado em //1984 POR
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26.52%
Os AA estudaram retrospectivamente os processos clínicos de 370 doentes com carcinoma da próstata, com o intuito de dar uma ideia da problemática desta doença em Portugal. Ressalvando o facto de a análise incidir sobre casos tratados por vários urologistas e não haver assim uniformidade nos critérios, são apresentadas sucessivamente as manifestações clínicas, métodos de diagnóstico presumível e definitivo e a terapêutica instituída. Apontam ainda a mortalidade, no país, nos últimos anos, por carcinoma da próstata e por tumores malignos em geral e apresentam uma tabela em que aquela é comparada com a de outros países.

Carcinoma da Próstata. Análise Retrospectiva de 370 casos

Matos Ferreira, A; Rangel, A; Barreto, J
Fonte: Centro Editor e Livreiro da Ordem dos Médicos Publicador: Centro Editor e Livreiro da Ordem dos Médicos
Tipo: Artigo de Revista Científica
Publicado em //1984 POR
Relevância na Pesquisa
26.52%
Os AA estudaram retrospectivamente os processos clínicos de 370 doentes com carcinoma da próstata, com o intuito de dar uma ideia da problemática desta doença em Portugal. Ressalvando o facto de a análise incidir sobre casos tratados por vários urologistas e não haver assim uniformidade nos critérios, são apresentadas sucessivamente as manifestações clínicas, métodos de diagnóstico presumível e definitivo e a terapêutica instituída. Apontam ainda a mortalidade, no país, nos últimos anos, por carcinoma da próstata e por tumores malignos em geral e apresentam uma tabela em que aquela é comparada com a de outros países.

Somaclones da cultivar de arroz aromático Basmati-370 resistentes à brusone

Araújo,Leila Garcês de; Prabhu,Anne Sitarama
Fonte: Embrapa Informação Tecnológica; Pesquisa Agropecuária Brasileira Publicador: Embrapa Informação Tecnológica; Pesquisa Agropecuária Brasileira
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2002 PT
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A cultivar de arroz aromático Basmati-370 é uma das preferidas no mercado mundial. Possui aroma agradável, grão extra-fino, e característica de alongamento após o cozimento; porém, é suscetível a alguns patótipos de Pyricularia grisea no Brasil. O objetivo do presente trabalho foi avaliar o grau de resistência à brusone, e algumas características agronômicas nas gerações avançadas de seus somaclones. Foram estudadas gerações R5 a R9, no campo, em viveiro de brusone e em casa de vegetação. Não foram observadas variações significativas na qualidade de grãos e outras características agronômicas. Entretanto, alguns somaclones apresentaram alto grau de resistência à brusone. Foram registrados no Banco Ativo de Germoplasma da Embrapa-Centro Nacional de Pesquisa de Arroz e Feijão 19 somaclones como novas fontes de arroz aromático. Dois somaclones, SCBAS04 e SBAS16, exibiram alto grau de resistência à brusone, e foram superiores à cultivar Basmati-370 quanto ao aroma.

Comparative trial of iohexol 350, a non-ionic contrast medium, with diatrizoate (Urografin 370) in left ventriculography and coronary arteriography.

Sullivan, I D; Wainwright, R J; Reidy, J F; Sowton, E
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /06/1984 EN
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In a prospective double blind randomised study in 25 consecutive patients a conventional ionic contrast medium (Urografin 370) was compared with the new non-ionic medium iohexol 350 ( Omnipaque ) in left ventriculography and coronary arteriography. In left ventriculography there was a clear patient preference for iohexol by both a visual analogue scale and independent observer assessment. Iohexol also induced a smaller increase in heart rate or decrease in systolic blood pressure than Urografin. In coronary arteriography iohexol resulted in a smaller reduction in heart rate and systolic blood pressure, a smaller maximum increase in RR interval, less prolongation of the PQ and QT intervals and QRS duration, and a lower incidence of induced chest pain, ST segment depression, or T wave deflection.

Comparison of Triosil 370 with Urografin 76 and Hypaque 65 for coronary arteriography.

Verel, D; Ward, C; Aman, M
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /10/1975 EN
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Triosil 370 has been compared with Urografin 76, and Hypaque 65 by injecting identical volumes into the coronary arteries of human subjects in the course of coronary arteriography. The injection times used were the same and neither the patient nor the coronary artery catheter were moved between injections. The order in which the solutions compared were injected was alternated. The deviation in the ST segment and of the T wave which resulted from the injection was measured. The Triosil caused significantly less change than Urografin and Hypaque. A numerical expression of the T wave deflection derived from the data showed Triosil:Hypaque:Urografin equals I:2.6:2.9.

Thr-370 Is Responsible for CDK11p58 Autophosphorylation, Dimerization, and Kinase Activity*

Chi, Yayun; Zhang, Chunyi; Zong, Hongliang; Hong, Yi; Kong, Xiangfei; Liu, Haiou; Zou, Weiying; Wang, Yanlin; Yun, Xiaojing; Gu, Jianxin
Fonte: American Society for Biochemistry and Molecular Biology Publicador: American Society for Biochemistry and Molecular Biology
Tipo: Artigo de Revista Científica
EN
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26.88%
CDK11p58, a member of the p34cdc2-related kinase family, is associated with cell cycle progression, tumorigenesis, and proapoptotic signaling. It is also required for the maintenance of chromosome cohesion, the maturation of centrosome, the formation of bipolar spindle, and the completion of mitosis. Here we identified that CDK11p58 interacted with itself to form homodimers in cells, whereas D224N, the kinase-dead mutant, failed to form homodimers. CDK11p58 was autophosphorylated, and the main functions of CDK11p58, such as kinase activity, transactivation of nuclear receptors, and proapoptotic signal transduction, were dependent on its autophosphorylation. Furthermore, the in vitro kinase assay indicated that CDK11p58 was autophosphorylated at Thr-370. By mutagenesis, we created CDK11p58 T370A and CDK11p58 T370D, which mimic the dephosphorylated and phosphorylated forms of CDK11p58, respectively. The T370A mutant could not form dimers and be phosphorylated by the wild type CDK11p58 and finally lost the kinase activity. Further functional research revealed that T370A failed to repress the transactivition of androgen receptor and enhance the cell apoptosis. Overall, our data indicated that Thr-370 is responsible for the autophosphorylation...

MicroRNA-370 controls the expression of MicroRNA-122 and Cpt1α and affects lipid metabolism[S]

Iliopoulos, Dimitrios; Drosatos, Konstantinos; Hiyama, Yaeko; Goldberg, Ira J.; Zannis, Vassilis I.
Fonte: The American Society for Biochemistry and Molecular Biology Publicador: The American Society for Biochemistry and Molecular Biology
Tipo: Artigo de Revista Científica
Publicado em /06/2010 EN
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We previously observed that treatment of mice with a dominant negative form of cJun (dn-cJun) increased the expression of genes involved in lipid metabolism and modulated the expression of nine microRNAs (miR). To investigate the potential effect of these miRs on the expression of the genes of lipid metabolism, we performed studies in cultured HepG2 cells. Transfection of HepG2 cells with sense or antisense miR-370 or miR-122 upregulated and downregulated, respectively, the transcription factor sterol-regulatory element binding protein 1c (SREBP-1c) and the enzymes diacylglycerol acyltransferase-2 (DGAT2), fatty acid synthase (FAS), and acyl-CoA carboxylase 1 (ACC1) that regulate fatty acid and triglyceride biosynthesis. The other seven miRs identified by the miR array screening did not affect the expression of lipogenic genes. miR-370 upregulated the expression of miR-122. Furthermore, the effect of miR-370 on the expression of the lipogenic genes was abolished by antisense miR-122. miR-370 targets the 3′ untranslated region (UTR) of Cpt1α, and it downregulated the expression of the carnitine palmitoyl transferase 1α (Cpt1α) gene as well as the rate of β oxidation. Our data suggest that miR-370 acting via miR-122 may have a causative role in the accumulation of hepatic triglycerides by modulating initially the expression of SREBP-1c...

Upregulation of MircoRNA-370 Induces Proliferation in Human Prostate Cancer Cells by Downregulating the Transcription Factor FOXO1

Wu, Ziqing; Sun, Huabin; Zeng, Weixia; He, Jincan; Mao, Xiangming
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 18/09/2012 EN
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Forkhead box protein O1 (FOXO1), a key member of the FOXO family of transcription factors, acts as a tumor suppressor and has been associated with various key cellular functions, including cell growth, differentiation, apoptosis and angiogenesis. Therefore, it is puzzling why FOXO protein expression is downregulated in cancer cells. MicroRNAs, non-coding 20∼22 nucleotide single-stranded RNAs, result in translational repression or degradation and gene silencing of their target genes, and significantly contribute to the regulation of gene expression. In the current study, we report that miR-370 expression was significantly upregulated in five prostate cancer cell lines, compared to normal prostatic epithelial (PrEC) cells. Ectopic expression of miR-370 induced proliferation and increased the anchorage-independent growth and colony formation ability of DU145 and LNCaP prostate cancer cells, while inhibition of miR-370 reduced proliferation, anchorage-independent growth and colony formation ability. Furthermore, upregulation of miR-370 promoted the entry of DU145 and LNCaP prostate cancer cells into the G1/S cell cycle transition, which was associated with downregulation of the cyclin-dependent kinase (CDK) inhibitors, p27Kip1 and p21Cip1...

Silencing of miR-370 in Human Cholangiocarcinoma by Allelic Loss and Interleukin-6 Induced Maternal to Paternal Epigenotype Switch

An, Fangmei; Yamanaka, Sumitaka; Allen, Sarah; Roberts, Lewis R.; Gores, Gregory J.; Pawlik, Timothy M.; Xie, Qing; Ishida, Masaharu; Mezey, Esteban; Ferguson-Smith, Anne C.; Mori, Yuriko; Selaru, Florin M.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 22/10/2012 EN
Relevância na Pesquisa
27.15%
Cholangiocarcinoma (CCA) is a highly lethal malignant tumor arising from the biliary tract epithelium. Interleukin-6 (IL-6) is a major mediator of inflammation and contributor to carcinogenesis within the biliary tree. Previous studies suggested that enforced IL-6 contributes to cholangiocarcinogenesis through hypermethylation of several genes implicated in CCA. However, the precise mechanisms of IL-6 effects in CCA remain unclear. We now demonstrate that microRNA (miR)-370 is underexpressed in a large cohort of human CCA vs. normal liver tissues. In addition, we show that IL-6 induces a time-dependent silencing of miR-370. In addition, demethylation of CCA cells results in upregulation of miR-370. Furthermore, we demonstrate that miR-370 is imprinted, and that the Intergenic Differentially Methylated Region (IG-DMR) responsible for imprinting regulation of this genomic locus is hypermethylated in response to IL-6 treatment. In addition, the IG-DMR is hypermethylated in human CCA specimens compared to normal matched controls, in the same location as the IL-6 induced hypermethylation. Finally, miR-370 was found to regulate WNT10B in luciferase as well as western blotting experiments. Our data indicate that the paternal allele of miR-370 is normally silenced through genomic imprinting and that the overexpression of IL-6 in CCA effectively suppresses the expression of miR-370 from the maternal allele...

A retrospective study of 370 patients with oral lichen planus in Turkey

Gümrü, Birsay
Fonte: Medicina Oral S.L. Publicador: Medicina Oral S.L.
Tipo: Artigo de Revista Científica
EN
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Objectives: Although several detailed studies concerning the patient profile and clinical features of oral lichen planus have been undertaken all over the world in different populations, a similar study has not yet been conducted in a Turkish population. The purpose of this retrospective study was to describe the demographic and clinical characteristics of a group of patients with oral lichen planus in Turkey. Study Design: Charts of 370 patients, from the archive of Oral Diagnosis and Radiology Department of Marmara University Faculty of Dentistry (Istanbul, Turkey), with histologically confirmed clinical diagnosis of oral lichen planus in the period 1990-2010 were retrospectively reviewed. Results: Of the 370 patients, 260 (70.3%) were women and 110 (29.7%) were men. The mean age was 49.84±13.41 years (range of 16-83). The lesions were asymptomatic in 63 patients (17%). Nearly half of the patients (47.6%) had multiple sites of involvement. Predominantly red forms were the most frequent, affecting 60.5% of patients. Approximately 17% of the patients had symptoms of possible extraoral involvement. No evidence suggesting a connection between oral lichen planus and tobacco or alcohol use was found. Only one out of the 370 cases had histologically proven malignant transformation. Conclusions: The patient profile and clinical features of oral lichen planus in Turkey were generally similar to those described in other populations. The preponderance of the red forms and also the fact that majority of patients referred themselves to our clinic highlighted the lack of awareness among Turkish health care providers about lichen planus.

Eleven secondary cancers after hematopoietic stem cell transplantation using a total body irradiation-based regimen in 370 consecutive pediatric and adult patients

Omori, Mami; Yamashita, Hideomi; Shinohara, Akihito; Kurokawa, Mineo; Takita, Jyunko; Hiwatari, Mitsuteru; Nakagawa, Keiichi
Fonte: Springer International Publishing Publicador: Springer International Publishing
Tipo: Artigo de Revista Científica
Publicado em 30/08/2013 EN
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About the bone marrow transplantation that high dose chemotherapy and total-body irradiation (TBI) are used for as conditioning regimen, a late toxicity may become the problem in the long-term survival patient. One of the toxicities which has been implied to be associated with TBI is secondary cacinogenesis. Between June 1995 and December 2010, 370 patients who were undergoing allogeneic hematopoietic stem cell transplantation using a TBI-based regimen at our department, were the subjects of this study. Eleven secondary cancers occurred in 10 patients. The median time from transplantation to diagnosis of a secondary cancer was 6.8 years. In this analysis, the cumulative incidence rate of secondary cancer at 5 and 10 years was 2.15% and 6.46%, respectively after TBI in our institution.

A note on performance of VM/370 in the integration of models and databases

Donovan, John J.
Fonte: MIT Energy Lab Publicador: MIT Energy Lab
Tipo: Trabalho em Andamento Formato: 869803 bytes; application/pdf
EN_US
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As the proliferation of programming systems and database systems continues and, correspondingly, as the need for integrating these systems for certain applications increases, VM/370 offers a mechanism for such integration. This paper analyzes the performance of a configuration of virtual machines using VM/370 that allows for the sharing of a database system among several incompatible programs in an interactive environment. Specifically, two aspects of performance are addressed--an experimental study of the overhead cost incurred in the interface mechanisms employed, and a theoretical study of the degradation of response time due to the locking mechanisms employed. The conclusion of the experimental observations is that for sophisticated, complex accesses to the database system, the overhead costs are relatively small. The result of the theoretical study is the quantification of that degradation as a function of speeds of the database machine and the rate with which queries are made. The discussion of the practical implications of this theoretical study presents ways to improve this degradation. The observed conclusion of this work is our feeling that, for certain application areas, the benefits resulting from increased effectiveness of users outweigh the costs incurred.; Prepared in association with the Alfred P. Sloan School of Management

Somaclones da cultivar de arroz aromático Basmati-370 resistentes à brusone.

ARAÚJO, L.G. de; PRABHU, A.S.
Fonte: Pesquisa Agropecuária Brasileira, Brasília, v.37, nº 8, p. 1127-1135, ago. 2002. Publicador: Pesquisa Agropecuária Brasileira, Brasília, v.37, nº 8, p. 1127-1135, ago. 2002.
Tipo: Artigo em periódico indexado (ALICE)
PT_BR
Relevância na Pesquisa
26.74%
A cultivar de arroz aromático Basmati-370 é uma das preferidas no mercado mundial. Possui aroma agradável, grão extra-fino, e característica de alongamento após o cozimento; porém, é suscetível a alguns patótipos de Pyricularia grisea no Brasil. O objetivo do presente trabalho foi avaliar o grau de resistência à brusone, e algumas características agronômicas nas gerações avançadas de seus somaclones. Foram estudadas gerações R5 a R9, no campo, em viveiro de brusone e em casa de vegetação. Não foram observadas variações significativas na qualidade de grãos e outras características agronômicas. Entretanto, alguns somaclones apresentaram alto grau de resistência à brusone. Foram registrados no Banco Ativo de Germoplasma da Embrapa-Centro Nacional de Pesquisa de Arroz e Feijão 19 somaclones como novas fontes de arroz aromático. Dois somaclones, SCBAS04 e SBAS16, exibiram alto grau de resistência à brusone, e foram superiores à cultivar Basmati-370 quanto ao aroma.; 2002

In vivo epinephrine reactivation of ocular herpes simplex virus type 1 in the rabbit is correlated to a 370-base-pair region located between the promoter and the 5' end of the 2.0 kilobase latency-associated transcript.

Hill, J M; Maggioncalda, J B; Garza, H H; Su, Y H; Fraser, N W; Block, T M
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /10/1996 EN
Relevância na Pesquisa
26.74%
A rabbit ocular model of epinephrine-induced herpes simplex virus type 1 reactivation was employed to study the effect of a deletion in the latency-associated transcript domain. A viral construct derived from 17Syn+, designated 17deltaSty, has a deletion of 370 nucleotides between genomic positions 118880 and 119250. 17deltaSty has been shown to reactivate with wild-type virus kinetics from explants of trigeminal ganglia from latently infected mice. To determine the behavior of this mutant in an in vivo, inducible reactivation system, rabbit corneas were infected with 17Syn+, 17deltaSty, or its rescuant, 17detlaSty-Res. After viral latency was established, transcorneal epinephrine iontophoresis was performed. The rabbits latently infected with 17deltaSty exhibited a significantly reduced ability to undergo adrenergically induced reactivation, i.e., viral shedding in the tears, compared with rabbits infected with either 17Syn+ or 17deltaSty-Res. However, quantitative PCR demonstrated similar numbers of viral genomes in the trigeminal ganglia from rabbits latently infected with all three viruses, and all three viruses reactivated in vitro with wild-type kinetics in an explant cocultivation assay. These studies indicate that the 370-bp region deleted in the 17deltaSty construct plays a role in epinephrine-induced reactivation.

A study of the neglected Galactic HII region NGC 2579 and its companion ESO 370-9

Copetti, M. V. F.; Oliveira, V. A.; Riffel, R.; Castañeda, H. O.; Sanmartim, D.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 13/07/2007
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26.88%
The Galactic HII region NGC 2579 has stayed undeservedly unexplored due to identification problems which persisted until recently. Both NGC 2579 and its companion ESO 370-9 have been misclassified as planetary or reflection nebula, confused with each other and with other objects. Due to its high surface brightness, high excitation, angular size of few arcminutes and relatively low interstellar extinction, NGC 2579 is an ideal object for investigations in the optical range. Located in the outer Galaxy, NGC 2579 is an excellent object for studying the Galactic chemical abundance gradients. In this paper we present the first comprehensive observational study on the nebular and stellar properties of NGC 2579 and ESO 370-9, including the determination of electron temperature, density structure, chemical composition, kinematics, distance, and the identification and spectral classification of the ionizing stars, and discuss the nature of ESO 370-9. Long slit spectrophotometric data in the optical range were used to derive the nebular electron temperature, density and chemical abundances and for the spectral classification of the ionizing star candidates. Halpha and UBV CCD photometry was carried out to derive stellar distances from spectroscopic parallax and to measure the ionizing photon flux.; Comment: To be published in Astronomy & Astrophysics

Abell 370 revisited: refurbished Hubble imaging of the first strong lensing cluster

Richard, Johan; Kneib, Jean-Paul; Limousin, Marceau; Edge, Alastair; Jullo, Eric
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
27.03%
We present a strong lensing analysis of the galaxy cluster Abell 370 (z=0.375) based on the recent multicolor ACS images obtained as part of the Early Release Observation (ERO) that followed the Hubble Service Mission #4. Back in 1987, the giant gravitational arc (z=0.725) in Abell 370 was one of the first pieces of evidence that massive clusters are dense enough to act as strong gravitational lenses. The new observations reveal in detail its disklike morphology, and we show that it can be interpreted as a complex five-image configuration, with a total magnification factor of 32+/-4. Moreover, the high resolution multicolor information allowed us to identify 10 multiply imaged background galaxies. We derive a mean Einstein radius of RE=39+/-2" for a source redshift at z=2, corresponding to a mass of M(

The Optical Identification of the X-ray Burster X1746-370 in the Globular Cluster NGC6441

Homer, L.; Anderson, Scott F.; Margon, Bruce; Downes, Ronald A.; Deutsch, Eric W.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
26.74%
We find convincing observational evidence to confirm the optical identification of the X-ray burster X1746-370 located in the globular cluster NGC6441. Chandra/HRC-I imaging yields a much improved X-ray position for the source, which we show to be fully consistent with our rederived position of a UV-excess star, U1, in the same astrometric reference frame. In addition, the smaller Chandra X-ray error circle excludes the only other blue stars previously identified in the old Einstein circle. We have also obtained Hubble Space Telescope/STIS time-resolved optical spectra of star U1. Although there are no strong line features, the flux distribution demonstrates U1 to be unusually bright in the blue and faint in the red, consistent with earlier WFPC2 photometry. More notably, the flux level of the continuum is seen to vary significantly compared to stars of similar brightness. Indeed, the lightcurve can plausibly be fit by a 5.73 hr period sinusoid, which is the period of the recurring X-ray dips seen in this source. The presence of modulations in both wavelengths strengthens the case for an orbital origin, and therefore deepens the puzzle of the unusual energy independent X-ray dips. Lastly, we note that X1746-370 remains the longest period confirmed X-ray burster in a globular cluster...

The HI gas content of galaxies around Abell 370, a galaxy cluster at z = 0.37

Lah, Philip; Pracy, Michael B.; Chengalur, Jayaram N.; Briggs, Frank H.; Colless, Matthew; De Propris, Roberto; Ferris, Shaun; Schmidt, Brian P.; Tucker, Bradley E.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 09/07/2009
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27.08%
We used observations from the Giant Metrewave Radio Telescope to measure the atomic hydrogen gas content of 324 galaxies around the galaxy cluster Abell 370 at a redshift of z = 0.37 (a look-back time of ~4 billion years). The HI 21-cm emission from these galaxies was measured by coadding their signals using precise optical redshifts obtained with the Anglo-Australian Telescope. The average HI mass measured for all 324 galaxies is (6.6 +- 3.5)x10^9 solar masses, while the average HI mass measured for the 105 optically blue galaxies is (19.0 +- 6.5)x10^9 solar masses. The significant quantities of gas found around Abell 370, suggest that there has been substantial evolution in the gas content of galaxy clusters since redshift z = 0.37. The total amount of HI gas found around Abell 370 is up to ~8 times more than that seen around the Coma cluster, a nearby galaxy cluster of similar size. Despite this higher gas content, Abell 370 shows the same trend as nearby clusters, that galaxies close to the cluster core have lower HI gas content than galaxies further away. The Abell 370 galaxies have HI mass to optical light ratios similar to local galaxy samples and have the same correlation between their star formation rate and HI mass as found in nearby galaxies. The average star formation rate derived from [OII] emission and from de-redshifted 1.4 GHz radio continuum for the Abell 370 galaxies also follows the correlation found in the local universe. The large amounts of HI gas found around the cluster can easily be consumed by the observed star formation rate in the galaxies over the ~4 billion years (from z = 0.37) to the present day.; Comment: accepted by MNRAS

VLA 1.4 GHz Catalogs of the Abell 370 and Abell 2390 Cluster Fields

Wold, I. G. B.; Owen, F. N.; Wang, W. -H.; Barger, A. J.; Keenan, R. C.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 12/07/2012
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26.97%
We present 1.4 GHz catalogs for the cluster fields Abell 370 and Abell 2390 observed with the Very Large Array. These are two of the deepest radio images of cluster fields ever taken. The Abell 370 image covers an area of 40'x40' with a synthesized beam of ~1.7" and a noise level of ~5.7 uJy near field center. The Abell 2390 image covers an area of 34'x34' with a synthesized beam of ~1.4" and a noise level of ~5.6 uJy near field center. We catalog 200 redshifts for the Abell 370 field. We construct differential number counts for the central regions (radius < 16') of both clusters. We find that the faint (S_1.4GHz < 3 mJy) counts of Abell 370 are roughly consistent with the highest blank field number counts, while the faint number counts of Abell 2390 are roughly consistent with the lowest blank field number counts. Our analyses indicate that the number counts are primarily from field radio galaxies. We suggest that the disagreement of our counts can be largely attributed to cosmic variance.; Comment: 13 pages, accepted for publication in ApJS