论文标题
高红移星系的质量尺度：用lega-c的恒星动力学模型校准的病毒质量估计
The Mass Scale of High-Redshift Galaxies: Virial Mass Estimates Calibrated with Stellar Dynamical Models from LEGA-C
论文作者
论文摘要
$ z = 0.6-1.0 $的$ 673 $星系的动力模型使用lega-c的空间分辨（长期截止）恒星运动数据用于校准定义为$ m _ {\ rm {vir}} =kσ'^2 _ {$ k $ k $ k $ m _ { $σ'_{\ star，\ rm {int}} $从lega-c调查中的空间融合的恒星速度和$ r $ $ r $ $ r $ thesérsicprofiles符合HST成像的有效半径。该样本代表$ m _ {\ star}> 3 \ times10^{10} 〜M _ {\ odot} $，并包括所有类型的星系，无论形态和颜色如何。 We demonstrate that using $R=R_{\rm{sma}}$~(the semi-major axis length of the ellipse that encloses 50\% of the light) in combination with an inclination correction on $σ'_{\star,\rm{int}}$~produces an unbiased $M_{\rm{vir}}$.我们通过在Atlas $^{\ rm {3d}} $〜$调查中显示出对$σ'_{\ rm {int}} $的投影影响的重要性。同样，如前所述，当使用基于Sérsic的$ r $估计值时，需要对radial概况中的非同源物质的Sérsic索引依赖性校正。关于从Atlas $^{\ rm {3D}} $〜调查的低红移星系的类似动力学模型，我们发现lega-c的校准病毒常数的系统偏移为0.1 DEX，这可能是由于星系样品之间的物理差异或未知的系统误差。无论哪种方式，我们的工作都建立了在8 Gyr宇宙时间中的星系的共同质量尺度，最多为0.1 DEX的系统不确定性。
Dynamical models for $673$ galaxies at $z=0.6-1.0$ with spatially resolved (long-slit) stellar kinematic data from LEGA-C are used to calibrate virial mass estimates defined as $M_{\rm{vir}}=K σ'^2_{\star,\rm{int}} R$, with $K$ a scaling factor, $σ'_{\star,\rm{int}}$ the spatially-integrated stellar velocity second moment from the LEGA-C survey and $R$ the effective radius measured from a Sérsic profile fit to HST imaging. The sample is representative for $M_{\star}>3\times10^{10}~M_{\odot}$ and includes all types of galaxies, irrespective of morphology and color. We demonstrate that using $R=R_{\rm{sma}}$~(the semi-major axis length of the ellipse that encloses 50\% of the light) in combination with an inclination correction on $σ'_{\star,\rm{int}}$~produces an unbiased $M_{\rm{vir}}$. We confirm the importance of projection effects on $σ'_{\star,\rm{int}}$ by showing the existence of a similar residual trend between virial mass estimates and inclination for the nearby early-type galaxies in the ATLAS$^{\rm{3D}}$~survey. Also, as previously shown, when using a Sérsic profile-based $R$ estimate, then a Sérsic index-dependent correction to account for non-homology in the radial profiles is required. With respect to analogous dynamical models for low-redshift galaxies from the ATLAS$^{\rm{3D}}$~survey we find a systematic offset of 0.1 dex in the calibrated virial constant for LEGA-C, which may be due to physical differences between the galaxy samples or an unknown systematic error. Either way, with our work we establish a common mass scale for galaxies across 8 Gyr of cosmic time with a systematic uncertainty of at most 0.1 dex.
