The Diverse Molecular Gas Content of Massive Galaxies Undergoing Quenching at z ∼ 1

The Diverse Molecular Gas Content of Massive Galaxies Undergoing Quenching at z ∼ 1
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z 〜 1 处淬火的大质量星系的不同分子气体含量

DOI:
10.3847/2041-8213/abe6a6
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发表时间:
2021
期刊:
The Astrophysical Journal Letters
影响因子:
--
通讯作者:
H. Übler
H. Übler
中科院分区:
--
文献类型:
--
作者:
S. Belli;A. Contursi;R. Genzel;L. Tacconi;N. Förster;D. Lutz;F. Combes;R. Neri;S. García;K. Schuster;R. Herrera;K. Tadaki;R. Davies;R. Davies;Benjamin D. Johnson;Minju M. Lee;J. Leja;E. Nelson;S. Price;J. Shangguan;T. Shimizu;S. Tacchella;H. Übler

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我们对处于不同淬灭阶段的 1 < z < 1.3 的三个大质量星系的分子气体含量和恒星族特性进行了详细研究。这些星系被选择为具有静态光学/近红外光谱能量分布和 24 μm 处相对明亮的发射,并表现出明显不同的特性。在深度 NOEMA 观测中检测到来自三个星系中每一个的 CO 排放,使我们能够得出 13%–23% 的分子气体分数 M 气体/M *。我们还通过将模型拟合到观测到的光度测量和光谱学来重建恒星形成历史,寻找一个物体近期再生、另一个物体缓慢猝灭以及第三个系统快速猝灭的证据。为了更好地限制猝灭机制,我们从文献中探索了我们的样品和其他类似样品在 z ∼ 0.7 处的耗尽时间。我们发现耗尽时间高度依赖于测量恒星形成率所采用的方法:使用 UV+IR 光度,我们获得的耗尽时间比使用尘埃校正的 [O ii] 发射得出的消耗时间短约 6 倍。当采用光谱拟合得出的恒星形成速率(可以说更稳健)时,我们发现最近熄灭的星系和恒星形成星系具有相似的耗尽时间,而较旧的静止系统具有更长的耗尽时间。这些结果为星系猝灭的物理模型提供了新的、重要的约束。
We present a detailed study of the molecular gas content and stellar population properties of three massive galaxies at 1 < z < 1.3 that are in different stages of quenching. The galaxies were selected to have quiescent optical/near-infrared spectral energy distribution and relatively bright emission at 24 μm, and show remarkably diverse properties. CO emission from each of the three galaxies is detected in deep NOEMA observations, allowing us to derive molecular gas fractions M gas/M * of 13%–23%. We also reconstruct the star formation histories by fitting models to the observed photometry and optical spectroscopy, finding evidence for recent rejuvenation in one object, slow quenching in another, and rapid quenching in the third system. To better constrain the quenching mechanism we explore the depletion times for our sample and other similar samples at z ∼ 0.7 from the literature. We find that the depletion times are highly dependent on the method adopted to measure the star formation rate: using the UV+IR luminosity we obtain depletion times about 6 times shorter than those derived using dust-corrected [O ii] emission. When adopting the star formation rates from spectral fitting, which are arguably more robust, we find that recently quenched galaxies and star-forming galaxies have similar depletion times, while older quiescent systems have longer depletion times. These results offer new, important constraints for physical models of galaxy quenching.
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DOI: 10.3847/2041-8213/aaca9a
发表时间: 2018
期刊: The Astrophysical Journal
影响因子: --
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