J/ApJ/923/11 Stellar kinematics of LEGA-C galaxies (van Houdt+, 2021)
Stellar dynamical models for 797 z∼0.8 galaxies from LEGA-C.
van Houdt J., van der Wel A., Bezanson R., Franx M., d'Eugenio F.,
Barisic I., Bell E.F., Gallazzi A., de Graaff A., Maseda M.V.,
Pacifici C., van de Sande J., Sobral D., Straatman C., Wu P.-F.
<Astrophys. J., 923, 11 (2021)>
=2021ApJ...923...11V 2021ApJ...923...11V
ADC_Keywords: Galaxies, spectra; Surveys; Optical; Galaxies, radius;
Rotational velocities; Velocity dispersion; Models
Keywords: Galaxies ; Galaxy dynamics ; Galaxy spectroscopy ; Galaxy kinematics ;
Galaxy structure ; Surveys
Abstract:
We present spatially resolved stellar kinematics for 797 z=0.6-1
galaxies selected from the LEGA-C survey and construct axisymmetric
Jeans models to quantify their dynamical mass and degree of rotational
support. The survey is Ks-band selected, irrespective of color or
morphological type, and allows for a first assessment of the stellar
dynamical structure of the general L* galaxy population at large
look-back time. Using light profiles from Hubble Space Telescope
imaging as a tracer, our approach corrects for observational effects
(seeing convolution and slit geometry), and uses well-informed priors
on inclination, anisotropy, and a non-luminous mass component.
Tabulated data include total mass estimates in a series of spherical
apertures (1, 5, and 10kpc; 1x and 2x Re), as well as rotational
velocities, velocity dispersions, and anisotropy. We show that almost
all star-forming galaxies and ∼50% of quiescent galaxies are rotation
dominated, with deprojected V/σ∼1-2. Revealing the complexity in
galaxy evolution, we find that the most massive star-forming galaxies
are among the most rotation dominated, and the most massive quiescent
galaxies among the least rotation-dominated galaxies. These
measurements set a new benchmark for studying galaxy evolution, using
stellar dynamical structure for galaxies at large look-back time.
Together with the additional information on stellar population
properties from the LEGA-C spectra, the dynamical mass and V/σ
measurements presented here create new avenues for studying galaxy
evolution at large look-back time.
Description:
This work is based on the Large Early Galaxy Astrophysics Census
(LEGA-C; van der Wel+ 2016ApJS..223...29V 2016ApJS..223...29V). LEGA-C is an ESO Public
Spectroscopic Survey with the VIMOS instrument on the VLT/UT3. The
survey has been completed and has collected 4081 spectra in the COSMOS
field. This paper uses the full sample, to be published in the recent
data release of the full sample (van der Wel+ 2021, J/ApJS/256/44).
We adopt the HST/ACS F814W imaging from COSMOS
(Koekemoer+ 2007ApJS..172..196K 2007ApJS..172..196K), which covers nearly all galaxies in
LEGA-C.
We also incorporate ground-based optical and near-infrared data from
DR1 of the UltraVISTA survey (Muzzin+ 2013, J/ApJS/206/8), the
photometric parent sample of LEGA-C.
See Section 2.2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 167 861 Stellar dynamical parameters
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/MNRAS/371/703 : MILES library of empirical spectra (Sanchez-Blazquez+, 2006)
J/ApJ/706/1364 : SINS survey of high-redshift gal. (Forster Schreiber+, 2009)
J/MNRAS/404/1639 : MILES base models & new line index system (Vazdekis+, 2010)
J/MNRAS/414/888 : ATLAS3D project. III. (Emsellem+, 2011)
J/ApJS/203/24 : Structural param. of gal. in CANDELS (van der Wel+, 2012)
J/ApJS/206/8 : COSMOS/UltraVISTA Ks-selected catalogs v4.1 (Muzzin+, 2013)
J/ApJ/777/18 : Stellar mass functions of galaxies to z=4 (Muzzin+, 2013)
J/ApJ/845/157 : IMF in 3 strong lenses from SNELLS (Newman+, 2017)
J/ApJ/858/60 : Quiescent galaxy kinematics from LEGA-C (Bezanson+, 2018)
J/MNRAS/477/4711 : Stellar angular momentum for ManGa galaxies (Graham+, 2018)
J/ApJS/239/27 : LEGA-C DR2: galaxies in the COSMOS field (Straatman+, 2018)
J/A+A/632/A59 : CALIFA gal. stellar angular momentum (Falcon-Barroso+, 2019)
J/ApJS/256/44 : LEGA-C DR3: high-quality sp. of gal. (van der Wel+, 2021)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- LEGA-C [5/4061] LEGA-C DR3 identifier (1)
6- 11 I6 --- [MMS2013] [4792/260858] Ultra-VISTA identifier
(see Muzzin+ 2013, J/ApJS/206/8)
13- 17 F5.2 kpc rmax [2.7/19] Extent of stellar kinematic data
19- 23 F5.2 kpc Re [0.4/22.3] Effective galaxy radius
25- 29 F5.2 [Msun] logM1 [-9.3/11]? Log model enclosed within 1kpc (2)
31- 35 F5.2 [Msun] E_logM1 [0.02/14]? The 84th percentile in logM1 (2)
37- 41 F5.2 [Msun] e_logM1 [0.01/11]? The 16th percentile in logM1 (2)
43- 48 F6.2 [Msun] logM5 [-11/11.6]? Log model enclosed within 5kpc (2)
50- 54 F5.2 [Msun] E_logM5 [0.02/57]? The 84th percentile in logM5 (2)
56- 60 F5.2 [Msun] e_logM5 [0.02/46]? The 16th percentile in logM5 (2)
62- 67 F6.2 [Msun] logM10 [-11.4/12]? Log model enclosed within 10kpc (2)
69- 72 F4.2 [Msun] E_logM10 [0.03/8]? The 84th percentile in logM10 (2)
74- 77 F4.2 [Msun] e_logM10 [0.03/8]? The 16th percentile in logM10 (2)
79- 84 F6.2 [Msun] logMRe [-11.1/12]? Log model enclosed within Re
86- 89 F4.2 [Msun] E_logMRe [0.02/5]? The 84th percentile in logMRe
91- 94 F4.2 [Msun] e_logMRe [0.02/4.2]? The 16th percentile in logMRe
96- 101 F6.2 [Msun] logM2Re [-11.3/11.9]? Log model enclosed within 2Re
103- 106 F4.2 [Msun] E_logM2Re [0.03/10]? The 84th percentile in logM2Re
108- 111 F4.2 [Msun] e_logM2Re [0.04/10]? The 16th percentile in logM2Re
113- 116 F4.2 --- kappa [0.09/2]? Rotation parameter (see Equation 1)
118- 121 F4.2 --- E_kappa [0/5]? The 84th percentile in kappa
123- 126 F4.2 --- e_kappa [0/2]? The 16th percentile in kappa
128- 133 F6.2 km/s VRe [0/381]? Rotational velocity at Re; edge-on
135- 140 F6.2 km/s E_VRe [0/197]? The 84th percentile in VRe
142- 147 F6.2 km/s e_VRe [0/264]? The 16th percentile in VRe
149- 154 F6.2 km/s sigma [42/301]? Velocity dispersion within Re;
face-on
156- 161 F6.2 km/s E_sigma [2/121]? The 84th percentile in sigma
163- 167 F5.2 km/s e_sigma [0/99]? The 16th percentile in sigma
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Note (1): Sequential numbers from van der Wel+, 2021, J/ApJS/256/44
Note (2): We have to allow for a dark component with a negative mass, see
Section 3.2.2. We choose the following notation for a negative mass:
logM=-10 means M=-1010 (not M=1e-10).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 04-Apr-2023