arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1504.02053astro-ph.GA
收藏

在OMEGA中发射线Galerkin的OSIRIS映射:I.--调查描述、数据分析以及最高密度区域的恒星形成和AGN活动

OMEGA -- OSIRIS Mapping of Emission-line Galaxies in A901/2: I.-- Survey description, data analysis, and star formation and AGN activity in the highest density regions

Ana L. Chies-Santos, Bruno Rodríguez del Pino, Alfonso Aragón-Salamanca, Steven P. Bamford, Meghan E. Gray, Christian Wolf, Asmus Böhm, David T. Maltby, Irene P… 展开作者

Ana L. Chies-Santos, Bruno Rodríguez del Pino, Alfonso Aragón-Salamanca, Steven P. Bamford, Meghan E. Gray, Christian Wolf, Asmus Böhm, David T. Maltby, Irene Pintos-Castro, Miguel Sánchez-Portal, Tim Weinzirl

摘要:

我们提出了一个概述和第一个结果,从欧米茄调查:OSIRIS映射的发射线星系团在多集群系统A901/2。这个项目的最终目标是研究在一个红移范围内的各种环境中的恒星形成和活动星系核活动。使用GTC上的OSIRIS仪器的可调谐滤波器模式,我们在包含z~0.167多簇系统A901/2的~0.5 X 0.5 deg 2区域上瞄准Halpha和[NII]发射线。在本文中,我们描述了调查的设计,观察和数据分析技术的发展。然后,我们提出了早期的结果,从两个OSIRIS点集中在核心的A901 a和A902集群。活动星系核和恒星形成(SF)对象的识别使用[NII]/H α与W_H α(WHAN)诊断图。活动星系核的宿主比SF星系更明亮,质量更大,并且具有更早的形态。这两个种群都倾向于位于我们研究的高密度区域的郊区。这些源的典型的H α光度明显低于场星系在类似的红移,但大于发现的A1689,一个丰富的集群在z~0.2。我们的物体的H α光度转换为恒星形成率(SFR)在~0.02和6 Msun/年之间。比较恒星质量和Halpha-derived SFR与现场发现的关系表明,在星团的核心恒星形成的抑制。这些发现与以前基于其他恒星形成指标对这种多星团结构的研究一致,并证明了可调滤波器在这种研究中的作用。

英文摘要:

We present an overview of and first results from the OMEGA survey: the OSIRIS Mapping of Emission-line Galaxies in the multi-cluster system A901/2. The ultimate goal of this project is to study star formation and AGN activity across a broad range of environments at a single redshift. Using the tuneable-filter mode of the OSIRIS instrument on GTC, we target Halpha and [NII] emission lines over a ~0.5 X 0.5 deg2 region containing the z~0.167 multi-cluster system A901/2. In this paper we describe the design of the survey, the observations and the data analysis techniques developed. We then present early results from two OSIRIS pointings centred on the cores of the A901a and A902 clusters. AGN and star-forming (SF) objects are identified using the [NII]/Halpha vs. W_Halpha (WHAN) diagnostic diagram. The AGN hosts are brighter, more massive, and possess earlier-type morphologies than SF galaxies. Both populations tend to be located towards the outskirts of the high density regions we study. The typical Halpha luminosity of these sources is significantly lower than that of field galaxies at similar redshifts, but greater than that found for A1689, a rich cluster at z~0.2. The Halpha luminosities of our objects translate into star-formation rates (SFRs) between ~0.02 and 6 Msun/yr. Comparing the relationship between stellar mass and Halpha-derived SFR with that found in the field indicates a suppression of star formation in the cores of the clusters. These findings agree with previous investigations of this multi-cluster structure, based on other star formation indicators, and demonstrate the power of tuneable filters for this kind of study.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑