J/ApJS/256/44 LEGA-C DR3: high-quality sp. of 0.6<z<1 gal. (van der Wel+, 2021)
The Large Early Galaxy Astrophysics Census (LEGA-C) Data Release 3:
3000 high-quality spectra of Ks-selected galaxies at z>0.6.
van der Wel A., Bezanson R., D'Eugenio F., Straatman C., Franx M.,
van Houdt J., Maseda M.V., Gallazzi A., Wu P.-F., Pacifici C.,
Barisic I., Brammer G.B., Munoz-Mateos J.C., Vervalcke S., Zibetti S.,
Sobral D., de Graaff A., Calhau J., Kaushal Y., Muzzin A., Bell E.F.,
van Dokkum P.G.
<Astrophys. J. Suppl. Ser., 256, 44 (2021)>
=2021ApJS..256...44V 2021ApJS..256...44V
ADC_Keywords: Galaxies, IR; Velocity dispersion; Redshifts;
Equivalent widths; Surveys; Spectra, optical
Mission_Name: ESO
Keywords: Galaxies ; Spectroscopy ; Galaxy spectroscopy ; Early-type
galaxies ; Late-type galaxies ; Surveys ; Stellar populations ;
Galaxy kinematics
Abstract:
We present the third and final data release of the Large Early Galaxy
Astrophysics Census (LEGA-C), an ESO/Very Large Telescope public
spectroscopic survey targeting 0.6<z<1.0, Ks-selected galaxies. The
data release contains 3528 spectra with measured stellar velocity
dispersions and stellar population properties, a 25-fold increase in
sample size compared to previous work. This Ks-selected sample probes
the galaxy population down to ∼0.3L*, for all colors and morphological
types. Along with the spectra, we publish a value-added catalog with
stellar and ionized gas velocity dispersions, stellar absorption line
indices, emission-line fluxes, and equivalent widths, complemented
with structural parameters measured from Hubble Space Telescope
Advanced Camera for Surveys imaging. With its combination of high
precision and large sample size, LEGA-C provides a new benchmark for
galaxy evolution studies.
Description:
The final survey footprint is created by 30 slightly overlapping
pointings, together covering 1.4255 square degrees (Figure 2), giving
a total survey comoving volume of 3.664x106Mpc3 between z=0.6
and z=1.0, equivalent to the local volume out to ∼100Mpc (z∼0.023).
With 2 additional pointings, the 32 masks produced 4081 galaxy
spectra, with 3741 unique objects (340 are observed more than once)
observed with the Visible Multi-Object Spectrograph (VIMOS) on the
Very Large Telescope at Paranal in Chile.
Observations were carried out between 2014 December and 2018 March. In
total, 211 (mostly partial) nights were spent observing in Visitor
Mode, for a total on-source integration time of 695hr out of the
allocated 1107hr.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
legacdr3.dat 921 4081 The Large Early Galaxy Astrophysics Census
(LEGA-C) DR3 catalog
sp/* . 4153 Individual spectra in FITS format from
the ESO archive
datafile2.fits 2880 . The catalog in FITS format
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See also:
J/PASP/110/863 : A Stellar Spectral Flux Library: 1150-25000A (Pickles 1998)
J/ApJ/633/174 : Spheroidals and bulge dominated galaxies (Treu+, 2005)
J/MNRAS/371/703 : MILES library of empirical spectra (Sanchez-Blazquez+, 2006)
J/A+A/485/657 : Physical param. of Wolf-Rayet galaxies (Brinchmann+, 2008)
J/ApJ/724/714 : Velocity disp. of MS1054-03 & Coma galaxies (Holden+, 2010)
J/ApJS/203/24 : Structural param. of gal. in CANDELS (van der Wel+, 2012)
J/AJ/145/77 : Imaging & spectro. in 3 galaxy clusters (Jorgensen+, 2013)
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/771/85 : Dynamical masses of z∼2 quiescent gal. (van de Sande+, 2013)
J/ApJ/788/72 : Observed sample of z∼0.7 massive galaxies (Gallazzi+, 2014)
J/ApJ/799/148 : DEIMOS galaxy sample at z∼0.7 (Bezanson+, 2015)
J/MNRAS/454/1332 : SFR in galaxies at redshift z∼0.8 (Shetty+, 2015)
J/ApJS/224/11 : SHELS: redshift survey of the F1 DLS field (Geller+, 2016)
J/ApJ/858/60 : z∼0.8 galaxy kinematics from LEGA-C (Bezanson+, 2018)
J/ApJS/239/27 : LEGA-C DR2: galaxies in the COSMOS field (Straatman+, 2018)
http://archive.eso.org/scienceportal/home?data_collection=LEGA-C : ESO archive
science portal, LEGA-C collection
Byte-by-byte Description of file: legacdr3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [1/4081] LEGA-C running sequence
number (ID of a unique spectrum)
(ID_LEGAC)
6- 11 I6 [-] [MMS2013] [3945/262197] UltraVISTA identifier
(Muzzin+ 2013, J/ApJ/777/18) (ID)
13- 15 I3 --- Mask [1/102] LEGA-C mask identifier
17- 21 F5.3 --- Fprim [0/1]? Primary source flag
( PRIMARY ) (1)
23- 31 F9.5 deg RAdeg [149.37/150.8] Right ascension
(J2000) in decimal degrees
from Muzzin+ 2013, J/ApJ/777/18 (RA)
33- 40 F8.6 deg DEdeg [1.7/2.9] Declination (J2000) in
decimal degrees
from Muzzin+ 2013, J/ApJ/777/18 (DEC)
42- 47 F6.2 0.1nm-1 S/N [0/129.7]?=- Average S/N
in Å-1 (SN)
49- 54 F6.2 0.1nm-1 SN4000 [0/121.5]?=- S/N at rest 4000Å
in Å-1 (SNRF4000)
56- 61 F6.2 0.1nm-1 SN8030 [0/147.6]?=- S/N at obs 8030Å
in Å-1 (SNOBS8030)
63- 69 F7.3 --- Tcor [0.5/105.6]?=- Total completeness
correction
71- 76 F6.3 --- Scor [1.4/11.4]?=- Selection correction
78- 82 F5.3 --- Vcor [1/9.6]?=- Volume correction
84- 86 F3.1 --- Fmorph [0/2]? Morphology flag
(FLAG_MORPH) (2)
88- 90 F3.1 --- Fsp [0/2] Spectroscopy flag
(0=no warning) (FLAG_SPEC) (3)
92- 97 F6.4 --- zsp [0.099/4.4]?=- LEGA-C
spectroscopic redshift (Z_SPEC)
99- 103 F5.1 km/s sigma* [17.6/623.3]?=- Stellar velocity
dispersion (SIGMA_STARS)
105- 108 F4.1 km/s e_sigma* [2.8/50]?=- sigma* uncertainty
(SIGMASTARSERR)
110- 114 F5.1 km/s sigmaGas [11.9/387.3]?=- Ionized gas
velocity dispersion (SIGMA_GAS)
116- 120 F5.2 km/s e_sigmaGas [0/57]?=- sigmaGas uncertainty
(SIGMAGASERR)
122- 129 F8.4 0.1nm HDA [-8.5/31.6]?=- Lick HδA
absorption line index in Å
(LICKHDA)
131- 137 F7.4 0.1nm e_HDA [0.1/18]?=- HDA uncertainty
(LICKHDA_ERR)
139- 146 F8.4 --- HDF [-10.3/25.3]?=- Lick HδF
absorption line index (LICKHDF)
148- 154 F7.4 --- e_HDF [0.07/18]?=- HDF uncertainty
(LICKHDF_ERR)
156- 163 F8.4 0.1nm HGA [-19.8/49.3]?=- Lick HγA
absorption line index in Å
(LICKHGA)
165- 172 F8.4 0.1nm e_HGA [0.1/226]?=- HGA uncertainty
(LICKHGA_ERR)
174- 181 F8.4 0.1nm HGF [-28.2/9.8]?=- Lick HγF
absorption line index in Å
(LICKHGF)
183- 190 F8.4 0.1nm e_HGF [0.07/139]?=- HGF uncertainty
(LICKHGF_ERR)
192- 199 F8.4 0.1nm HB [-4.8/13.2]?=- Lick Hβ
absorption line index in Å
(LICK_HB)
201- 207 F7.4 0.1nm e_HB [0.1/22]?=- HB uncertainty
(LICKHBERR)
209- 215 F7.4 mag CN1 [-0.4/0.8]?=- Lick CN1 absorption
line index (LICK_CN1)
217- 222 F6.4 mag e_CN1 [0.004/0.7]?=- CN1 uncertainty
(LICKCN1ERR)
224- 230 F7.4 mag CN2 [-0.4/0.5]?=- Lick CN2 absorption
line index (LICK_CN2)
232- 237 F6.4 mag e_CN2 [0.005/0.5]?=- CN2 uncertainty
(LICKCN2ERR)
239- 247 F9.4 0.1nm CA4227 [-12.4/297]?=- Lick CA4227
absorption line index in Å
(LICK_CA4227)
249- 255 F7.4 0.1nm e_CA4227 [0.06/56]?=- CA4227 uncertainty
(LICKCA4227ERR)
257- 265 F9.4 0.1nm G4300 [-17.3/329]?=- Lick G4300
absorption line index in Å
(LICK_G4300)
267- 274 F8.4 0.1nm e_G4300 [0.1/228]?=- G4300 uncertainty
(LICKG4300ERR)
276- 283 F8.4 0.1nm FE4383 [-19.3/16]?=- Lick Fe4383
absorption line index in Å
(LICK_FE4383)
285- 292 F8.4 0.1nm e_FE4383 [0.1/200]?=- FE4383 uncertainty
(LICKFE4383ERR)
294- 301 F8.4 0.1nm CA4455 [-14.6/14.5]?=- Lick CA4455
absorption line index in Å
(LICK_CA4455)
303- 309 F7.4 0.1nm e_CA4455 [0.08/78]?=- CA4455 uncertainty
(LICKCA4455ERR)
311- 318 F8.4 0.1nm FE4531 [-18.5/18.5]?=- Lick CA4531
absorption line index in Å
(LICK_FE4531)
320- 327 F8.4 0.1nm e_FE4531 [0.1/218]?=- FE4531 uncertainty
(LICKFE4531ERR)
329- 336 F8.4 0.1nm C4668 [-26/27.3]?=- Lick CA4668
absorption line index in Å
(LICK_C4668)
338- 345 F8.4 0.1nm e_C4668 [0.3/263]?=- C4668 uncertainty
(LICKC4668ERR)
347- 354 F8.4 0.1nm FE5015 [-11.8/12.5]?=- Lick Fe5015
absorption line index in Å
(LICK_FE5015)
356- 362 F7.4 0.1nm e_FE5015 [0.1/39]?=- FE5015 uncertainty
(LICKFE5015ERR)
364- 370 F7.4 mag MG1 [-1.1/0.16]?=- Lick MG1 absorption
line index (LICK_MG1)
372- 377 F6.4 mag e_MG1 [0.0029/0.3]?=- MG1 uncertainty
(LICKMG1ERR)
379- 385 F7.4 mag MG2 [-0.18/0.3]?=- Lick MG2 absorption
line index (LICK_MG2)
387- 392 F6.4 mag e_MG2 [0.004/0.3]?=- MG2 uncertainty
(LICKMG2ERR)
394- 400 F7.4 0.1nm MGB [-9.1/5.8]?=- Lick MgB absorption
line index in Å (LICK_MGB)
402- 407 F6.4 0.1nm e_MGB [0.1/9.9]?=- MGB uncertainty
(LICKMGBERR)
409- 415 F7.4 0.1nm FE5270 [-6.8/6.4]?=- Lick Fe5270
absorption line index in Å
(LICK_FE5270)
417- 423 F7.4 0.1nm e_FE5270 [0.1/69.3]?=- FE5270 uncertainty
(LICKFE5270ERR)
425- 433 F9.4 0.1nm FE5335 [-9.4/156]?=- Lick Fe5335
absorption line index in Å
(LICK_FE5335)
435- 442 F8.4 0.1nm e_FE5335 [0.1/380]?=- FE5335 uncertainty
(LICKFE5335ERR)
444- 451 F8.4 0.1nm FE5406 [-4.6/13]?=- Lick Fe5406
absorption line index in Å
(LICK_FE5406)
453- 459 F7.4 0.1nm e_FE5406 [0.1/44]?=- FE5406 uncertainty
(LICKFE5406ERR)
461- 466 F6.4 --- D4000N [0.88/3.5]?=- The D4000 line index
(D4000_N)
468- 473 F6.4 --- e_D4000N [0.006/1.1]?=- D4000N uncertainty
(D4000NERR)
475- 483 F9.4 10-21W/m2/nm FOII3727 [-35/8816]?=- [OII]3727 emission-line
flux in 10^-19erg/s/cm2/Å
(OII3727FLUX)
485- 496 F12.4 10-21W/m2/nm e_FOII3727 [0/9e+6]?=- FOII3727 uncertainty
(OII3727FLUX_ERR)
498- 506 F9.4 0.1nm EWOII3727 [-1.1/145.6]?=- [OII]3727 equivalent
width in Å (OII3727EW)
508- 514 F7.4 0.1nm e_EWOII3727 [0.06/51]?=- EWOII3727 uncertainty
(OII3727EW_ERR)
516- 524 F9.4 10-21W/m2/nm FNEIII3869 [-49.5/1647]?=- NeIII3869
emission-line flux in
10^-19erg/s/cm2/Å
(NEIII3869FLUX)
526- 533 F8.4 10-21W/m2/nm e_FNEIII3869 [0/319]?=- FNEIII3869 uncertainty
(NEIII3869FLUX_ERR)
535- 542 F8.4 0.1nm EWNEIII3869 [-4.7/24.7]?=- NeIII3869 equivalent
width in Å (NEIII3869EW)
544- 550 F7.4 0.1nm e_EWNEIII3869 [0.04/19]?=- EWNEIII3869
uncertainty (NEIII3869EW_ERR)
552- 559 F8.4 10-21W/m2/nm FHEI3890 [-47.7/449.8]?=- HeI3890
emission-line flux in
10^-19erg/s/cm2/Å (HEI3890FLUX)
561- 568 F8.4 10-21W/m2/nm e_FHEI3890 [0/816]?=- FHEI3890 uncertainty
(HEI3890FLUX_ERR)
570- 577 F8.4 0.1nm EWHEI3890 [-3.9/16]?=- HeI3890 equivalent
width in Å (HEI3890EW)
579- 585 F7.4 0.1nm e_EWHEI3890 [0.04/48.4]?=- EWHEI3890
uncertainty (HEI3890EW_ERR)
587- 594 F8.4 10-21W/m2/nm FHD [-48.7/721.6]?=- Hδ
emission-line flux in
10^-19erg/s/cm2/Å (HDELTAFLUX)
596- 606 F11.4 10-21W/m2/nm e_FHD [0/366715]?=- FHD uncertainty
(HDELTAFLUX_ERR)
608- 616 F9.4 0.1nm EWHD [-46.8/1209.6]?=- Hδ
equivalent width in Å (HDELTAEW)
618- 628 F11.4 0.1nm e_EWHD [0.028/614752]?=- EWHD uncertainty
(HDELTAEW_ERR)
630- 639 E10.4 10-21W/m2/nm FHG [-49.3/5.9e+10]?=- Hγ
emission-line flux in
10^-19erg/s/cm2/Å (HGAMMAFLUX)
641- 649 E9.4 10-21W/m2/nm e_FHG [0/2.1e+17]?=- FHG uncertainty
(HGAMMAFLUX_ERR)
651- 660 E10.4 0.1nm EWHG [-2.9/9e+10]?=- Hγ
equivalent width in Å (HGAMMAEW)
662- 670 E9.4 0.1nm e_EWHG [0.019/3.2e+17]?=- EWHG
uncertainty (HGAMMAEW_ERR)
672- 679 F8.4 10-21W/m2/nm FOIII4363 [-79.6/268.5]?=- OIII4363
emission-line flux in
10^-19erg/s/cm2/Å
(OIII4363FLUX)
681- 688 F8.4 10-21W/m2/nm e_FOIII4363 [0/186]?=- FOIII4363 uncertainty
(OIII4363FLUX_ERR)
690- 697 F8.4 0.1nm EWOIII4363 [-47.8/9.7]?=- OIII4363
equivalent width in Å
(OIII4363EW)
699- 705 F7.4 0.1nm e_EWOIII4363 [0.018/86]?=- EWOIII4363
uncertainty (OIII4363EW_ERR)
707- 715 F9.4 10-21W/m2/nm FHB [-49.2/2614]?=- Hβ
emission-line flux in
10^-19erg/s/cm2/Å (HBETAFLUX)
717- 725 F9.4 10-21W/m2/nm e_FHB [0/3087]?=- FHB uncertainty
(HBETAFLUX_ERR)
727- 734 F8.4 0.1nm EWHB [-2/87.2]?=- Hβ equivalent
width in Å (HBETAEW)
736- 742 F7.4 0.1nm e_EWHB [0.015/98]?=- EWHB uncertainty
(HBETAEW_ERR)
744- 752 F9.4 10-21W/m2/nm FOIII4959 [-75.2/4474]?=- OIII4959
emission-line flux in
10^-19erg/s/cm2/Å (OIII4959FLUX)
754- 761 F8.4 10-21W/m2/nm e_FOIII4959 [0/645]?=- FOIII4959 uncertainty
(OIII4959FLUX_ERR)
763- 770 F8.4 0.1nm EWOIII4959 [-44.4/44]?=- OIII4959 equivalent
width in Å (OIII4959EW)
772- 778 F7.4 0.1nm e_EWOIII4959 [0.007/45]?=- EWOIII4959
uncertainty (OIII4959EW_ERR)
780- 790 F11.4 10-21W/m2/nm FOIII5007 [-72/13073]?=- OIII5007
emission-line flux in
10^-19erg/s/cm2/Å (OIII5007FLUX)
792- 800 F9.4 10-21W/m2/nm e_FOIII5007 [0/4139]?=- FOIII5007 uncertainty
(OIII5007FLUX_ERR)
802- 810 F9.4 0.1nm EWOIII5007 [-3.9/3264]?=- OIII5007 equivalent
width in Å (OIII5007EW)
812- 820 F9.4 0.1nm e_EWOIII5007 [0.015/1866]?=- EWOIII5007
uncertainty (OIII5007EW_ERR)
822- 828 F7.4 arcsec Reff [0.018/12]?=- Effective radius
(SERSIC_RE)
830- 835 F6.4 arcsec e_Reff [0.002/2.1]?=- Reff uncertainty
(SERSICREERR)
837- 842 F6.4 --- n [0.2/6]?=- Sersic index (SERSIC_N)
844- 849 F6.4 --- e_n [0.03/2]?=- n uncertainty
(SERSICNERR)
851- 856 F6.4 --- q [0/1]?=- Axis ratio (SERSIC_Q)
858- 863 F6.4 --- e_q [0.03/0.2]?=- q uncertainty
(SERSICQERR)
865- 872 F8.4 deg PA [-90/90]?=- Position angle, from
North to East (SERSIC_PA)
874- 880 F7.4 deg e_PA [2.8/16]?=- PA uncertainty
(SERSICPAERR)
882- 887 F6.3 mag F814Wmag [18.7/26.4]?=- Total F814W AB
magnitude (SERSIC_MAG)
889- 894 F6.4 mag e_F814Wmag [0.1/0.4]?=- Uncertainty on the
F814Wmag (SERSICMAGERR)
896- 899 F4.2 --- Lim [0/1]?=- Galfit constraint flag
(SERSIC_LIMIT) (4)
901- 905 F5.1 km/s sigmaVir [16/624]?=- Virial velocity
dispersion (SIGMASTARSVIR)
907- 910 F4.1 km/s e_sigmaVir [2.8/50]?=- sigmaVir uncertainty
(SIGMASTARSVIR_ERR)
912- 916 F5.2 [Msun] logMvir [8.6/12.6]?=- Virial mass
(LOG_MVIR) (5)
918- 921 F4.2 [Msun] e_logMvir [0.05/0.8]?=- logMvir uncertainty
(LOGMVIRERR)
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Note (1): The PRIMARY flag indicates whether the galaxy was selected as follows:
1 = from the Ks-band selected parent sample (primary; 3028 occurrences)
0 = as a filler (1053 occurrences)
Note (2): Morphology flag as follows:
0 = single galaxies with regular morphologies (3824 occurrences)
1 = spectra for which the light coming through the slit does not come
from single, regular galaxies (e.g. irregular or multiple galaxies;
243 occurrences)
2 = not a single, regular galaxy and the light comes from galaxies
at different redshifts (14 occurrences)
See Section 4.2.
Note (3): Spectroscopy flag as follows:
1 = galaxies with mid-infrared and/or X-ray AGNs which might have compromised
the interpretation of the index measurements (107 occurrences)
2 = the photometry-based flux calibration showed significant imperfections,
potentially compromising the measurement of absorption and emission
indices (25 occurrences)
See Section 4.2.
Note (4): We give an SERSIC_LIMIT flag to indicate for which objects the
parameters reached the galfit limiting value (e.g., n=6).
Note (5): We publish the virial mass and its uncertainty, derived as explained
in an accompanying paper (J. van Houdt et al. 2021, in preparation).
In short, it is given by Equation (1):
Mvir=K(n)((σ2*,virRsma)/G)
where n is the Sersic index, K(n)=8.87_0.831n+0.0241n2, Rsma is
the semimajor axis length Reff in kpc, G the gravitational
constant, and σ*,vir (sigmaVir) is the inclination- and
aperture-corrected velocity dispersion as in Equation (2):
σ*,vir=σ'*,int2(0.87+0.39.e-3.78(1-q))
and q is the projected axis ratio.
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History:
From electronic version of the journal for Table 2 in FITS format.
Spectra downloaded from:
http://archive.eso.org/scienceportal/home?data_collection=LEGA-C
(End) Emmanuelle Perret [CDS] 01-Mar-2022