J/ApJ/928/126 Dynamical masses of z∼0.8 galaxies from LEGA-C (Straatman+, 2022)
LEGA-C: analysis of dynamical masses from ionized gas and stellar kinematics at
z∼0.8.
Straatman C.M.S., van der Wel A., van Houdt J., Bezanson R., Bell E.F.,
van Dokkum P., D'Eugenio F., Franx M., Gallazzi A., de Graaff A.,
Maseda M., Meidt S.E., Muzzin A., Sobral D., Wu P.-F.
<Astrophys. J., 928, 126 (2022)>
=2022ApJ...928..126S 2022ApJ...928..126S
ADC_Keywords: Galaxies, spectra; Photometry; Surveys; Rotational velocities;
Velocity dispersion; Galaxies, radius; Optical
Keywords: Galaxy evolution ; High-redshift galaxies ; Galaxy dynamics
Abstract:
We compare dynamical mass estimates based on spatially extended
stellar and ionized gas kinematics (Mdyn,* and Mdyn,eml,
respectively) of 157 star-forming galaxies at 0.6≤z<1. Compared with
z∼0, these galaxies have enhanced star formation rates, with stellar
feedback likely affecting the dynamics of the gas. We use LEGA-C DR3,
the highest-redshift data set that provides sufficiently deep
measurements of a Ks-band limited sample. For Mdyn,*, we use Jeans
anisotropic multi-Gaussian expansion models. For Mdyn,eml, we first
fit a custom model of a rotating exponential disk with uniform
dispersion, whose light is projected through a slit and corrected for
beam smearing. We then apply an asymmetric drift correction based on
assumptions common in the literature to the fitted kinematic
components to obtain the circular velocity, assuming hydrostatic
equilibrium. Within the half-light radius, Mdyn,eml is on average
lower than Mdyn,*, with a mean offset of -0.15±0.016dex and
galaxy-to-galaxy scatter of 0.19dex, reflecting the combined random
uncertainty. While data of higher spatial resolution are needed to
understand this small offset, it supports the assumption that the
galaxy-wide ionized gas kinematics do not predominantly originate from
disruptive events such as star formation-driven outflows. However, a
similar agreement can be obtained without modeling from the integrated
emission line dispersions for axis ratios q<0.8. This suggests that
our current understanding of gas kinematics is not sufficient to
efficiently apply asymmetric drift corrections to improve dynamical
mass estimates compared with observations lacking the signal-to-noise
ratio required for spatially extended dynamics.
Description:
We used data from LEGA-C Data Release 3 (DR3;
van der Wel+ 2016ApJS..223...29V 2016ApJS..223...29V ; see J/ApJS/239/27 &
2021, J/ApJS/256/44). LEGA-C is an ESO 130-night public spectroscopic
survey of COSMOS conducted with VIMOS on the Very Large Telescope. In
total, 4209 exceptionally deep, spatially extended slit spectra were
taken of 3855 unique sources in the UltraVISTA photometric catalog
(Muzzin+ 2013, J/ApJS/206/8). The resolution properties of the LEGA-C
spectra are R∼3500 and FWHM=86km/s (σ=36km/s).
See Section 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 79 212 Emission-line dynamic quantities
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See also:
II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)
II/373 : The fourth UltraVISTA data release (DR4) (Moneti+, 2019)
J/A+A/424/447 : Kinematics in 17 nearby spiral galaxies (Pizzella+, 2004)
J/ApJ/653/1027 : TKRS/GOODS-N Field galaxies (Weiner+, 2006)
J/AJ/134/945 : Tully-Fisher relation for SDSS galaxies (Pizagno+, 2007)
J/MNRAS/401/2113 : GHASP: Hα data cubes for 153 galaxies (Epinat+, 2010)
J/ApJ/741/115 : Deep spectroscopy in the GOODS fields (Miller+, 2011)
J/A+A/544/A156 : UltraVISTA Catalogue Release DR1 (McCracken+, 2012)
J/ApJS/206/8 : COSMOS/UltraVISTA Ks-selected catalogs v4.1 (Muzzin+, 2013)
J/A+A/564/A125 : AGN Torus model comparison of AGN in CDFS (Buchner+, 2014)
J/MNRAS/437/1070 : DYNAMO. Hα luminous galaxies sample (Green+, 2014)
J/MNRAS/467/1965 : KMOS Redshift One Spectroscopic Survey (Harrison+, 2017)
J/ApJ/842/121 : Tully-Fisher relation with KMOS3D (Ubler+, 2017)
J/ApJ/858/60 : z∼0.8 quiescent gal. kinematic from LEGA-C (Bezanson+, 2018)
J/MNRAS/474/5076 : KMOS Redshift One Spectroscopic Survey (Johnson+, 2018)
J/ApJS/239/27 : LEGA-C DR2: galaxies in the COSMOS field (Straatman+, 2018)
J/ApJ/886/124 : Completed KMOS3D survey NIR obs. (Wisnioski+, 2019)
J/ApJS/256/44 : LEGA-C DR3: sp. of 0.6<z<1 gal. (van der Wel+, 2021)
J/ApJ/913/103 : SED modelling of LEGA-C+HST massive gal. (de Graaff+, 2021)
J/ApJ/923/11 : Stellar kinematics of LEGA-C galaxies (van Houdt+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 1 I1 --- Set [1/4] Sample (1)
3- 8 I6 --- [MMS2013] [10462/260092] Identifier from
Muzzin+ 2013, J/ApJ/777/18
10- 14 F5.3 arcsec Re [0.6/2.5] Radial extent
16- 20 F5.1 km/s vrot-Re [24.6/485.3] Rotational velocity at Re
22- 22 A1 --- f_vrot-Re Flag on f_vrot-Re (2)
24- 28 F5.1 km/s e_vrot-Re [1/153.4] Uncertainty in vrot-Re
30- 34 F5.1 km/s vrot-2Re [25.9/506.3] Rotational velocity at 2*Re
36- 36 A1 --- f_vrot-2Re Flag on f_vrot-2Re (2)
38- 42 F5.1 km/s e_vrot-2Re [1/170.7] Uncertainty in vrot-2Re
44- 48 F5.1 km/s sigma0 [9.5/353.4] Isotropic velocity dispersion
50- 53 F4.1 km/s e_sigma0 [0.4/75.4] Uncertainty in sigma0
55- 59 F5.2 [Msun] logMdyn-Re [9.9/11.7] log, dynamical mass inside Re
61- 61 A1 --- f_logMdyn-Re Flag on f_logMdyn-Re (2)
63- 66 F4.2 [Msun] e_logMdyn-Re [0.05/0.5] Uncertainty in logMdyn-Re
68- 72 F5.2 [Msun] logMdyn-2Re [10.4/12.1] log, dynamical mass
inside 2*Re
74- 74 A1 --- f_logMdyn-2Re Flag on f_logMdyn-2Re (2)
76- 79 F4.2 [Msun] e_logMdyn-2Re [0.05/0.6] Uncertainty in logMdyn-2Re
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Note (1): Samples as follows:
1 = main sample (Sersic n≤2.5; 157 occurrences)
2 = high Sersic star forming galaxies (46 occurrences)
3 = low Sersic quiescent galaxies (4 occurrences)
4 = high Sersic quiescent galaxies (5 occurrences)
Note (2): Flags as follows:
a = limited spatial extent for either gas or stars (radial extent <1.2Re)
b = limited spatial extent for either gas or stars (radial extent <1.2 2Re)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 23-Feb-2024