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Tightly Coupled Morpho-kinematic Evolution for Massive Star-forming and Quiescent Galaxies across 7 Gyr of Cosmic Time
The Astrophysical Journal Letters ( IF 7.9 ) Pub Date : 2020-11-06 , DOI: 10.3847/2041-8213/abc428
Anna de Graaff 1 , Rachel Bezanson 2 , Marijn Franx 1 , Arjen van der Wel 3, 4 , Eric F. Bell 5 , Francesco D’Eugenio 3 , Bradford Holden 6 , Michael V. Maseda 1 , Adam Muzzin 7 , Camilla Pacifici 8 , Jesse van de Sande 9, 10 , David Sobral 11 , Caroline M. S. Straatman 3 , Po-Feng Wu 12
Affiliation  

We use the Fundamental Plane (FP) to measure the redshift evolution of the dynamical mass-to-light ratio (M dyn/L) and the dynamical-to-stellar mass ratio (M dyn/M *). Although conventionally used to study the properties of early-type galaxies, we here obtain stellar kinematic measurements from the Large Early Galaxy Astrophysics Census (LEGA-C) Survey for a sample of ∼1400 massive ($\mathrm{log}({M}_{* }/{M}_{\odot })\gt 10.5$) galaxies at 0.6<z<1.0 that span a wide range in star formation activity. In line with previous studies, we find a strong evolution in M dyn/L g with redshift. In contrast, we find only a weak dependence of the mean value of M dyn/M * on the specific star formation rate, and a redshift evolution that likely is explained by systematics. Therefore, we demonstrate that star-forming and quiescent galaxies lie on the same, stable mass FP across 0<z<1, and that the decrease in M dyn/L g toward high redshift can be attributed entirely to evolution of the stellar populations. Moreover, we show that the growth of galaxies in size and mass is constrained to occur within the mass FP. Our results imply either minimal structural evolution in massive galaxies since z∼1, or a tight coupling in the evolution of their morphological and dynamical properties, and establish the mass FP as a tool for studying galaxy evolution with low impact from progenitor bias.



中文翻译:

横跨7 Gyr的宇宙时间紧密耦合的形态运动学演化,用于大规模的恒星形成和静止星系

我们使用基本面(FP)来测量动态质量与光照质量比(M dyn / L)和动态质量与恒星质量比(M dyn / M *)的红移演变。尽管通常用于研究早期星系的属性,但我们在这里从大型早期星系天体物理学普查(LEGA-C)获得了恒星运动学测量结果,该图样本覆盖了1400个大$ \ mathrm {log}({M} _ {*} / {M} _ {\ odot})\ gt 10.5 $星系,样本范围为0.6 < z <1.0广泛的恒星形成活动。与以前的研究一致,我们发现M dyn / L g有很强的变化 红移。相比之下,我们发现M dyn / M *平均值对特定恒星形成速率的依赖性很小,并且红移演化很可能由系统学解释。因此,我们证明恒星形成星系和静止星系位于0 < z <1上相同,稳定的质量FP上,并且M dyn / L g向高红移的降低可以完全归因于恒星种群的演化。此外,我们表明星系的大小和质量的增长被限制在质量FP内发生。我们的结果暗示自z以来大质量星系的最小结构演化 〜1或它们的形态和动力学特性的演化紧密耦合,并建立了质量FP,作为研究由祖先偏见影响很小的星系演化的工具。

更新日期:2020-11-06
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