Autor: |
Wel, Arjen van der, Houdt, Josha van, Bezanson, Rachel, Franx, Marijn, D’Eugenio, Francesco, Straatman, Caroline, Bell, Eric F., Muzzin, Adam, Sobral, David, Maseda, Michael V., de Graaff, Anna, Holden, Bradford P. |
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Zdroj: |
Astrophysical Journal; 9/1/2022, Vol. 936 Issue 1, p1-10, 10p |
Abstrakt: |
Dynamical models for 673 galaxies at z = 0.6â€"1.0 with spatially resolved (long-slit) stellar kinematic data from LEGA-C are used to calibrate virial mass estimates defined as M vir = K Ď â€˛ ⋆ , int 2 R , with K a scaling factor, Ď â€˛ ⋆ , int the spatially integrated stellar velocity second moment from the LEGA-C survey, and R the effective radius measured from a SĂ©rsic profile fit to Hubble Space Telescope imaging. The sample is representative for M ⋆ > 3 Ă— 1010 M ⊙ and includes all types of galaxies, irrespective of morphology and color. We demonstrate that using R = R sma (the semimajor axis length of the ellipse that encloses 50% of the light) in combination with an inclination correction on Ď â€˛ ⋆ , int produces an unbiased M vir. We confirm the importance of projection effects on Ď â€˛ ⋆ , int by showing the existence of a similar residual trend between virial mass estimates and inclination for the nearby early-type galaxies in the ATLAS3D survey. Also, as previously shown, when using a SĂ©rsic profile-based R estimate, a SĂ©rsic index-dependent correction to account for nonhomology in the radial profiles is required. With respect to analogous dynamical models for low-redshift galaxies from the ATLAS3D 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. [ABSTRACT FROM AUTHOR] |
Databáze: |
Complementary Index |
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