Red Nuggets at High Redshift: Structural Evolution of Quiescent Galaxies Over 10 Gyr of Cosmic History
Ivana Damjanov, Roberto G. Abraham, Karl Glazebrook, Patrick J. McCarthy, Evelyn Caris, Raymond G. Carlberg, Hsiao-Wen Chen, David Crampton, Andrew W. Green, In… 展开作者
Ivana Damjanov, Roberto G. Abraham, Karl Glazebrook, Patrick J. McCarthy, Evelyn Caris, Raymond G. Carlberg, Hsiao-Wen Chen, David Crampton, Andrew W. Green, Inger Jørgensen, Stéphanie Juneau, Damien Le Borgne, Ronald O. Marzke, Erin Mentuch, Richard Murowinski, Kathy Roth, Sandra Savaglio, Haojing Yan
We present an analysis of the size growth seen in early-type galaxies over 10 Gyr of cosmic time. Our analysis is based on a homogeneous synthesis of published data from 17 spectroscopic surveys observed at similar spatial resolution, augmented by new measurements for galaxies in the Gemini Deep Deep Survey. In total, our sample contains structural data for 465 galaxies (mainly early-type) in the redshift range 0.2<z<2.7. The size evolution of passively-evolving galaxies over this redshift range is gradual and continuous, with no evidence for an end or change to the process around z~1, as has been hinted at by some surveys which analyze subsets of the data in isolation. The size growth appears to be independent of stellar mass, with the mass-normalized half-light radius scaling with redshift as R_e (1+z)^(-1.62 +/- 0.34). Surprisingly, this power law seems to be in good agreement with the recently reported continuous size evolution of UV-bright galaxies in the redshift range z~0.5-3.5. It is also in accordance with the predictions from recent theoretical models.
Observations of environmental quenching in groups in the 11 Gyr since z=2.5: different quenching for central and satellite galaxies
我们提出了在红移范围0<z<2.5的星系群中恒星形成猝灭的直接观测证据。我们利用一个大样本的近6000组,选择固定的累积数密度从三个光度计目录,按照中央和卫星星系在大约11 Gyr的不断发展的静止分数。在z~0处,我们样本中的中心星系的恒星质量范围从银河系/M31类似物(M= 6.5 × 10^10 M \solar)到附近的大质量椭圆星系(M= 1.5 × 10^11 M \solar)。同一星系群中的卫星星系的质量低至大麦云(M= 6.5 × 10^9 M \solar)的两倍。使用统计背景减法,我们测量的平均静止帧颜色的星系在我们的集团和计算的演变静止分数的中心和卫星超过7个红移箱。我们的分析显示了明确的证据,恒星形成淬火组晕,与不同的淬火开始的中心和他们的卫星星系。利用我们中心星系的晕质量估计,我们发现当典型的晕质量达到10^12和10^13 M \solar之间时,恒星形成在中心关闭,这与晕淬灭模型的预测一致。相比之下,同一星系群中的卫星星系很可能会受到环境过程的影响而发生淬灭,其发生时间相对于它们的中央星系要延迟。虽然随着时间的推移,所有星系的恒星形成都受到抑制,但控制中心星系和卫星星系淬火的过程是不同的。虽然质量在决定中央星系的恒星形成活动方面起着重要作用,但卫星星系的猝灭主要取决于它们所处的环境。
Accelerated galaxy growth and environmental quenching in a protocluster at z=3.24
我们提出了一个多波长的研究星系D4 UD 01,光谱证实的原星系团在z = 3.24调查环境的趋势。根据Ks波段测光红移(photo-z)为3.0 < z < 3.4的观测结果,选取了450个星系,其中约12%为静止星系。静止星系是整个样本中质量最大、最红的星系之一。我们确定了一个大的photo-z星系在外地,这是接近以前光谱证实的来源的原星系团。我们发现,静止的星系主要集中在过密的原星系团区域具有较高的静止分数,显示出环境淬火的迹象。在恒星质量函数中,原星系团中的星系团形成的速度比场的对应物要快,这表明在过密区域有早期和加速的质量组装。虽然在原星团中发现了恒星形成受到抑制的微弱证据,但统计数据还不足以得出明确的结论。我们的工作揭示了当宇宙只有2 Gyr时,大质量星系的形成是如何在原星系团的致密区域受到影响的。
A Strongly-Lensed Massive Ultra-Compact Quiescent Galaxy at z ~ 2.4 in the COSMOS/UltraVISTA Field
We report the discovery of a massive ultra-compact quiescent galaxy that has been strongly-lensed into multiple images by a foreground galaxy at z = 0.960. This system was serendipitously discovered as a set of extremely Ks-bright high-redshift galaxies with red J - Ks colors using new data from the UltraVISTA YJHKs near-infrared survey. The system was also previously identified as an optically-faint lens/source system using the COSMOS ACS imaging by Faure et al. (2008, 2011). Photometric redshifts for the three brightest images of the source galaxy determined from twenty-seven band photometry…
The Assembly Histories of Quiescent Galaxies Since z=0.7 from Absorption Line Spectroscopy
我们提出了从斯隆数字巡天(SDSS)和AGN和星系演化巡天(AGES)的0.1 < z < 0.7之间的静止星系的大样本的光学光谱建模的结果。我们研究了星系的恒星年龄和丰度模式是如何随时间演化的,作为恒星质量的函数,从10^{9.6}-10 ^<$11.8} Msun。星系光谱被堆叠在质量和红移的箱中,并在4000 A到5500 A的波长范围内建模。全光谱恒星星族合成模型提供了元素Fe、Mg、C、N和Ca的年龄和丰度的估计。我们发现,在固定恒星质量在大约7 Gyr的宇宙时间的元素丰度可以忽略不计的演变。此外,大质量星系的恒星年龄随时间的增加与z = 0.7以来的被动演化一致。总而言之,这些结果支持这样一种情况:大质量静止星系的内部~ 0.3-3 R_e在宇宙时间的后半部分一直被动地演化。有趣的是,在所有的历元中,恒星年龄都比宇宙年龄年轻得多,与z 1的等效单次爆发恒星形成历元< 1.5. These young stellar population ages coupled with the existence of massive quiescent galaxies at z >一致,表明z < 0.7的静止星群的不均匀性。这些数据还允许在z < 0.7时,质量低于~10^{10.5} Msun的新淬灭星系的加入。此外,我们分析了非常深的凯克DEIMOS光谱的两个最…
Old Universe, Young SNe Ia: A Statistical Analysis of Type Ia Supernova Progenitor Age from 6,983 TITAN Host Galaxies, and Implications for Cosmology
Johns Hopkins University(约翰斯·霍普金斯大学);University of Oxford(牛津大学);University of Southampton(南安普顿大学);Rutgers, the State University of New Jersey(新泽西州立罗格斯大学);Space Telescope Science Institute(太空望远镜科学研究所);Boston University(波士顿大学);University of Hawai’i(夏威夷大学)
COSMOS-Web galaxy groups: Evolution of red sequence and quiescent galaxy fraction
University of Bologna(博洛尼亚大学);INAF – Osservatorio di Astrofisica e Scienza dello Spazio(意大利国家天体物理研究所空间天文观测站);Zentrum für Astronomie, Universität Heidelberg(海德堡大学天体物理中心);Institut für Theoretische Physik, Universität Heidelberg(海德堡大学理论物理研究所);INFN – Sezione di Bologna(意大利国家核物理研究所博洛尼部分会);Aalto University(阿尔托大学);University of Helsinki(赫尔辛基大学);University of California, Riverside(加州大学河滨分校)
Widespread Inflows Reveal Baryonic Cycling in Star-forming and Quiescent Galaxies
Chinese Academy of Sciences(中国科学院);Shanghai Astronomical Observatory, Chinese Academy of Sciences(中国科学院上海天文台);University of Chinese Academy of Sciences(中国科学院大学);Indian Institute of Astrophysics (IIA)(印度天体物理研究所);Fudan University(复旦大学);Peking University(北京大学);Kavli Institute for Astronomy and Astrophysics, Peking University(北京大学科维理天文与天体物理研究所);Department of Physics, Fudan University(复旦大学物理系);Department of Astronomy, School of Physics, Peking University(北京大学物理学院天文学系);International Centre for Radio Astronomy Research, University of Western Australia(西澳大利亚大学国际无线电天文研究中心);University of Western Australia(西澳大利亚大学)