OmegaWINGS: The First Complete Census of Post-starburst Galaxies in Clusters in the Local Universe
OmegaWINGS: The First Complete Census of Post-starburst Galaxies in Clusters in the Local Universe
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OmegaWINGS：对本地宇宙星团中星爆发后星系的首次完整普查
DOI：
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
M. D’Onofrio
中科院分区：
文献类型：
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作者：
A. Paccagnella;B. Vulcani;B. Poggianti;J. Fritz;G. Fasano;A. Moretti;Y. Jaffé;A. Biviano;M. Gullieuszik;D. Bettoni;A. Cava;W. Couch;M. D’Onofrio
突然中断恒星形成的星系在其光谱中呈现出目前可识别的特征（无发射和Hδ吸收），被称为星爆后星系（PSB）。通过研究它们的恒星群特性和它们在星团中的位置，我们对恒星形成淬火的物理过程有了有价值的见解。基于WINGS和OmegaWINGS的数据，我们首次对星系团中的PSB星系进行了完整的表征，并将它们的特性与被动（PAS）和发射在线（EML）星系的特性进行了对比。因为，psb占1.2倍半径内星系团星系的7.2±0.2%。根据x射线光度和速度色散的定义，它们的发生率从外围向星团中心和从最小向最明亮和质量最大的星团略有增加。相空间分析和速度色散曲线表明，psb代表了具有不同吸积历史的星系的组合。此外，具有最强Hδ的psb与最近的吸积一致。psb具有介于PAS和EML星系之间的恒星质量、星等、颜色和形态，是典型的从恒星形成向被动转变的星系群。在较长时间尺度上，将psb的比例与跃迁星系的比例进行比较，我们估计短时间尺度恒星形成淬火通道对被动星族增长的贡献是长时间尺度的两倍。撞击压力剥离和星系-星系相互作用等过程在影响恒星形成方面比扼杀更有效。
Galaxies that abruptly interrupt their star formation in present recognizable features in their spectra (no emission and Hδ in absorption) and are called post-starburst (PSB) galaxies. By studying their stellar population properties and their location within the clusters, we obtain valuable insights on the physical processes responsible for star formation quenching. We present the first complete characterization of PSB galaxies in clusters at , based on WINGS and OmegaWINGS data, and contrast their properties to those of passive (PAS) and emission-line (EML) galaxies. For , PSBs represent 7.2 ± 0.2% of cluster galaxies within 1.2 virial radii. Their incidence slightly increases from the outskirts toward the cluster center and from the least toward the most luminous and massive clusters, defined in terms of X-ray luminosity and velocity dispersion. The phase-space analysis and velocity-dispersion profile suggest that PSBs represent a combination of galaxies with different accretion histories. Moreover, PSBs with the strongest Hδ are consistent with being recently accreted. PSBs have stellar masses, magnitudes, colors, and morphologies intermediate between PAS and EML galaxies, typical of a population in transition from being star-forming to passive. Comparing the fraction of PSBs to the fraction of galaxies in transition on longer timescales, we estimate that the short-timescale star formation quenching channel contributes two times more than the long timescale one to the growth of the passive population. Processes like ram-pressure stripping and galaxy–galaxy interactions are more efficient than strangulation in affecting star formation.
LoCuSS：星系团中恒星形成的缓慢淬灭以及预处理的需要
DOI：
10.1088/0004-637x/806/1/101
发表时间：
2015
期刊：
The Astrophysical Journal
影响因子：
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作者：
Haines C
通讯作者：
Haines C