The connection between stellar mass, age, and quenching time-scale in massive quiescent galaxies at z ? 1
The connection between stellar mass, age, and quenching time-scale in massive quiescent galaxies at z ? 1
复制标题
z 处大质量静止星系中恒星质量、年龄和淬灭时间尺度之间的联系？
DOI：
10.1093/mnras/stad773
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发表时间：
2023
影响因子：
4.8
通讯作者：
Hamadouche M
中科院分区：
文献类型：
--
作者：
Hamadouche M
我们提出了从VANDELS调查中提取的1.0 <z< 1.3的静止星系质量完整样本的分光光度研究，探索恒星质量，年龄和恒星形成历史之间的关系。在114个星系的样本中，我们得出了恒星质量与恒星年龄的关系，恒星质量每十年斜率为gyr。结合最近的文献结果，我们发现证据表明，该关系的斜率在红移区间0 <z< 4上保持一致。VANDELS静止样品中的星系显示了广泛的恒星形成历史，平均淬火时间尺度为1.4±0.1 Gyr。我们还发现在VANDELS静止星系的猝灭时间尺度上有很大的散射，这与先前的证据一致，即星系atz ~ 1通过多种机制停止恒星形成。然后，我们将重点放在样本中最古老的星系上，发现在z= 3之前因恒星质量而熄灭的星系的数量密度。虽然不确定，但这一估计与3 <z< 4的最新观测结果很好地吻合，初步表明，在红移区间1 <z< 3内最古老的大质量静止星系的演化中，年轻化和合并事件都没有发挥主要作用。
We present a spectrophotometric study of a mass-complete sample of quiescent galaxies at 1.0 <z< 1.3 withdrawn from the VANDELS survey, exploring the relationship between stellar mass, age, and star-formation history. Within our sample of 114 galaxies, we derive a stellar–mass versus stellar–age relation with a slope ofGyr per decade in stellar mass. When combined with recent literature results, we find evidence that the slope of this relation remains consistent over the redshift interval 0 <z< 4. The galaxies within the VANDELS quiescent sample display a wide range of star-formation histories, with a mean quenching time-scale of 1.4 ± 0.1 Gyr. We also find a large scatter in the quenching time-scales of the VANDELS quiescent galaxies, in agreement with previous evidence that galaxies atz∼ 1 cease star formation via multiple mechanisms. We then focus on the oldest galaxies in our sample, finding that the number density of galaxies that quenched beforez= 3 with stellar massesis. Although uncertain, this estimate is in good agreement with the latest observational results at 3 <z< 4, tentatively suggesting that neither rejuvenation nor merger events are playing a major role in the evolution of the oldest massive quiescent galaxies within the redshift interval 1 <z< 3.