论文标题
Hectomap静脉星系的尺寸和光谱演变
Size and Spectroscopic Evolution of HectoMAP Quiescent Galaxies
论文作者
论文摘要
Hectomap调查提供了30,231个静态星系的完整，限制的样本，其中包括$ i- $ band Suprime-Cam Subaru战略计划（HSC SSP）成像，该图像跨越了Redshift范围$ 0.2 <z <z <0.6 $。我们将基于HSC SSP成像的半光半径与红移和D $ _N4000 $相结合，以探索尺寸 - 质量关系，$ r_ {e} = a \ times m _ {*}^α$，以及整个Hectomap Quiescent usections use的演变。 $ 1.5 <\ mathrm {d} _n4000 <1.6 $的新移民在每个红移时显示出$ a $的增长，$ a $随着宇宙年龄的增长幅度比已经在调查限制限制的星系中降临的人口较高，$ z \ sim \ sim \ sim 0.6 $（居住人群）。在与以前的研究相吻合的广义上，整个Hectomap样本的大小 - 质量关系的演变和居民人群（但仅针对新移民）与较小的合并驱动的增长是一致的。对于居民人口，大小 - 质量关系的发展与人口年龄为$ z \ sim 0.6 $。新移民样本与居民人群之间的对比提供了对普遍称为“祖细胞偏见”在大小 - 质量关系演变中的作用的洞察力。
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.
