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arXiv 2210.01129astro-ph.GA
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HectoMAP静态半导体的尺寸和光谱演化

Size and Spectroscopic Evolution of HectoMAP Quiescent Galaxies

Ivana Damjanov, Jubee Sohn, Margaret J. Geller, Yousuke Utsumi, Ian Dell'Antonio

摘要:

HectoMAP巡天提供了一个完整的,质量有限的30,231个静止星系的样本,$i-$波段超Suprime-Cam斯巴鲁战略计划(HSC SSP)成像,跨越红移范围$0.2 <z < 0.6$。我们结合半光半径与红移和D $_n4000$ HSC SSP成像的基础上探索的大小-质量关系,$R_{e} = A \times M_{*}^α$,其演变为整个HectoMAP静态人口和两个子集的数据。随着宇宙年龄的增长,在每个红移处具有$1.5 < \mathrm{D}_n4000 < 1.6$的新成员的$A$的增加比在观测极限处已经静止的星系下降的人口$z \sim 0.6$(常住人口)更陡峭。与先前的研究广泛一致,整个HectoMAP样本和常住人口(但不仅仅是新来者)的大小-质量关系的演变与轻微合并驱动的增长一致。在$z \sim 0.6$中,对于常住人口,大小-质量关系的演变与人口年龄无关.新来者和常住人口样本之间的对比提供了对通常称为“祖先偏见”的大小-质量关系演变的作用的洞察。

英文摘要:

The HectoMAP survey provides a complete, mass-limited sample of 30,231 quiescent galaxies with $i-$band Hyper Suprime-Cam Subaru Strategic Program (HSC SSP) imaging that spans the redshift range $0.2 <z < 0.6$. We combine half-light radii based on HSC SSP imaging with redshifts and D$_n4000$ to explore the size - mass relation, $R_{e} = A \times M_{*}^α$, and its evolution for the entire HectoMAP quiescent population and for two subsets of the data. Newcomers with $1.5 < \mathrm{D}_n4000 < 1.6$ at each redshift show a steeper increase in $A$ as the universe ages than the population that descends from galaxies that are already quiescent at the survey limit, $z \sim 0.6$ (the resident population). In broad agreement with previous studies, evolution in the size - mass relation both for the entire HectoMAP sample and for the resident population (but not for the newcomers alone) is consistent with minor merger driven growth. For the resident population, the evolution in the size - mass relation is independent of the population age at $z \sim 0.6$. The contrast between the sample of newcomers and the resident population provides insight into the role of commonly termed "progenitor bias" on the evolution of the size - mass relation.

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