J/ApJS/239/27 LEGA-C DR2: galaxies in the COSMOS field (Straatman+, 2018)
The Large Early Galaxy Astrophysics Census (LEGA-C) data release 2: dynamical
and stellar population properties of z≲1 galaxies in the COSMOS field.
Straatman C.M.S., van der Wel A., Bezanson R., Pacifici C., Gallazzi A.,
Wu P.-F., Noeske K., Barisic I., Bell E.F., Brammer G.B., Calhau J.,
Chauke P., Franx M., van Houdt J., Labbe I., Maseda M.V.,
Munoz-Mateos J.C., Muzzin A., van de Sande J., Sobral D., Spilker J.S.
<Astrophys. J. Suppl. Ser., 239, 27-27 (2018)>
=2018ApJS..239...27S 2018ApJS..239...27S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra; Velocity dispersion; Redshifts;
Equivalent widths; Surveys; Optical
Mission_Name: ESO
Keywords: catalogs; galaxies: evolution; surveys; techniques: spectroscopic
Abstract:
We present the second data release of the Large Early Galaxy
Astrophysics Census (LEGA-C), an ESO 130-night public spectroscopic
survey conducted with VIMOS on the Very Large Telescope. We release
1988 spectra with typical continuum S/N∼20Å-1 of galaxies at
0.6≲z≲1.0, each observed for ∼20hr and fully reduced with a
custom-built pipeline. We also release a catalog with spectroscopic
redshifts, emission-line fluxes, Lick/IDS indices, and observed
stellar and gas velocity dispersions that are spatially integrated
quantities, including both rotational motions and genuine dispersion.
To illustrate the new parameter space in the intermediate-redshift
regime probed by LEGA-C, we explore relationships between dynamical
and stellar population properties. The star-forming galaxies typically
have observed stellar velocity dispersions of ∼150km/s and strong
Hδ absorption (HδA∼5Å), while passive galaxies have
higher observed stellar velocity dispersions (∼200km/s) and weak
Hδ absorption (HδA∼0Å). Strong [OIII]5007/Hβ
ratios tend to occur mostly for galaxies with weak HδA or
galaxies with higher observed velocity dispersion. Beyond these broad
trends, we find a diversity of possible combinations of rest-frame
colors, absorption-line strengths, and emission-line detections,
illustrating the utility of spectroscopic measurements to more
accurately understand galaxy evolution.
Description:
From 2014 December to 2018 March, 20hr deep integrations have been
obtained for over 4000 targets with the Visible Multi-Object
Spectrograph (VIMOS) on the Very Large Telescope at Paranal in
Chile.
The Large Early Galaxy Astrophysics Census (LEGA-C) survey strategy
and science goals have been presented by van der Wel+
(2016ApJS..223...29V 2016ApJS..223...29V), accompanied by a first release of 892 spectra
and corresponding spectroscopic redshifts. In this paper we present
Data Release II (DR2).
The primary targets are chosen from a Ks-band magnitude-selected
parent sample of ∼10000 galaxies with photometric redshifts z=0.6-1
drawn from the Ultra Deep Survey with the VISTA telescope (UltraVISTA)
catalog (Muzzin+ 2013, J/ApJS/206/8), which overlaps for the most part
with the already extensively photometrically covered COSMOS field
(Figure 1).
In this release we present the data from masks 1 through 15 out of the
total 32 masks which were observed during the ESO observing periods 94
to 98, from 2014 December to 2017 January.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
legacdr2.dat 670 1988 Large Early Galaxy Census (LEGA-C)
spectroscopic survey DR2 catalog
sp/* . 1988 Individual reduced 1D spectra in FITS format
--------------------------------------------------------------------------------
See also:
III/250 : The VIMOS VLT deep survey (VVDS-DEEP) (Le Fevre+ 2005)
J/ApJS/234/21 : Hectospec survey of galaxies in COSMOS (Damjanov+, 2018)
J/ApJ/830/51 : FourStar galaxy evolution survey (ZFOURGE) (Straatman+, 2016)
J/ApJ/799/148 : DEIMOS galaxy sample at z∼0.7 (Bezanson+, 2015)
J/ApJ/795/165 : Line ratios in z∼2-3 gal. from KBSS-MOSFIRE (Steidel+, 2014)
J/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014)
J/MNRAS/442/533 : Recently quenched elliptical gal. in SDSS (McIntosh+, 2014)
J/ApJ/788/72 : Observed sample of z∼0.7 massive galaxies (Gallazzi+, 2014)
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/ApJS/206/8 : COSMOS/UltraVISTA Ks-selected catalogs v4.1 (Muzzin+, 2013)
J/AJ/145/77 : Imaging and spectroscopy in 3 gal. clusters (Jorgensen+, 2013)
J/MNRAS/396/818 : Blue early-type galaxies in Galaxy Zoo (Schawinski+, 2009)
J/A+A/499/47 : Lick indices of EDCSN galaxies (Sanchez-Blazquez+, 2009)
J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007)
J/ApJ/665/1067 : Velocities in Cl 0024+16 and MS 0451-03 (Moran+, 2007)
J/ApJ/633/174 : Spheroidals and bulge dominated galaxies (Treu+, 2005)
J/ApJS/111/377 : Hγ + Hδ absorption features (Worthey+ 1997)
J/ApJS/94/687 : Old stellar populations. V. (Worthey+, 1994)
http://www.mpia.de/home/legac/ : LEGA-C survey data releases page
Byte-by-byte Description of file: legacdr2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- [MMS2013] [25061/262197] UltraVISTA ID (OBJECT)
8- 17 A10 --- SpID Unique identifier (mask no.+object ID)
(SPECT_ID)
19- 27 F9.5 deg RAdeg [149.7/150.8] Right ascension (J2000)
(RAJ2000)
29- 35 F7.5 deg DEdeg [1.7/2.9] Declination (J2000) (DECJ2000)
37- 44 F8.6 --- z [0.1/2.5]? Spectroscopic redshift (z)
46- 71 A26 --- Filename FITS file name of the original spectrum
in subdirectory sp (Filename)
73- 78 F6.1 km/s sigma* [0.2/1000]?=- Velocity dispersion of the
stellar component (SIGMASTARSPRIME)
80- 87 E8.3 km/s e_sigma* [0/4.7e+12]?=- sigma* uncertainty
(SIGMASTARSPRIME_err)
89- 93 F5.1 km/s sigmaGas [1.6/400]? Velocity dispersion of the
gaseous component (SIGMAGASPRIME)
95- 99 F5.1 km/s e_sigmaGas [0.2/587]? sigmaGas uncertainty
(SIGMAGASPRIME_err)
101-109 F9.6 0.1nm CN1 [-2.9/0.3]?=- Lick/IDS absorption index
CN1 (LICK_CN1)
111-120 F10.6 0.1nm e_CN1 [0.0008/364]?=- CN1 uncertainty
(LICKCN1err)
122-130 F9.6 0.1nm CN2 [-1.4/0.4]?=- Lick/IDS absorption index
CN2 (LICK_CN2)
132-139 F8.6 0.1nm e_CN2 [0.0008/4.6]?=- CN2 uncertainty
(LICKCN2err)
141-150 F10.6 0.1nm CA4227 [-7.1/445]?=- Lick/IDS absorption index
Ca4227 (LICK_CA4227)
152-164 F13.6 0.1nm e_CA4227 [0.0001/933676]?=- CA4227 uncertainty
(LICKCA4227err)
166-175 F10.6 0.1nm G4300 [-36.5/17.3]?=- Lick/IDS absorption index
G4300 (LICK_G4300)
177-186 F10.6 0.1nm e_G4300 [0.0002/140]?=- G4300 uncertainty
(LICKG4300err)
188-197 F10.6 0.1nm FE4383 [-65/25.5]?=- Lick/IDS absorption index
Fe4383 (LICK_FE4383)
199-208 F10.6 0.1nm e_FE4383 [0.0003/282]?=- FE4383 uncertainty
(LICKFE4383err)
210-220 F11.6 0.1nm CA4455 [-250/24]?=- Lick/IDS absorption index
Ca4455 (LICK_CA4455)
222-234 F13.6 0.1nm e_CA4455 [0.0002/291787]?=- CA4455 uncertainty
(LICKCA4455err)
236-246 F11.6 0.1nm FE4531 [-39.3/1552]?=- Lick/IDS absorption index
Fe4531 (LICK_FE4531)
248-261 F14.6 0.1nm e_FE4531 [0.0004/6.5e+06]?=- FE4531 uncertainty
(LICKFE4531err)
263-273 F11.6 0.1nm C4668 [-229.3/41.1]?=- Lick/IDS absorption
index C4668 (LICK_C4668)
275-284 F10.6 0.1nm e_C4668 [0.002/414]?=- C4668 uncertainty
(LICKC4668err)
286-295 F10.6 0.1nm HB [-29.4/50]?=- Lick/IDS absorption index
Hβ (LICK_HB)
297-306 F10.6 0.1nm e_HB [0.0003/128]?=- HB uncertainty
(LICKHBerr)
308-317 F10.6 0.1nm HDA [-17.5/50.3]?=- Lick/IDS absorption index
HδA (LICKHDA)
319-328 F10.6 0.1nm e_HDA [0.0008/409]?=- HDA uncertainty
(LICKHDA_err)
330-339 F10.6 0.1nm HGA [-97.1/29.1]?=- Lick/IDS absorption index
HγA (LICKHGA)
341-350 F10.6 0.1nm e_HGA [0.003/550]?=- HGA uncertainty
(LICKHGA_err)
352-361 F10.6 0.1nm HDF [-11.5/57.5]?=- Lick/IDS absorption index
HδF (LICKHDF)
363-372 F10.6 0.1nm e_HDF [0.0008/138]?=- HDF uncertainty
(LICKHDF_err)
374-383 F10.6 0.1nm HGF [-16/18.2]?=- Lick/IDS absorption index
HγF (LICKHGF)
385-393 F9.6 0.1nm e_HGF [0.0002/71]?=- HGH uncertainty
(LICKHGF_err)
395-402 F8.6 0.1nm D4000N [0.3/2.8]?=- Lick/IDS absorption index
D4000n (LICKD4000N)
404-411 F8.6 0.1nm e_D4000N [0.0003/0.8]?=- D4000N uncertainty
(LICKD4000N_err)
413-422 F10.3 10-22W/m2 FHd [0.1/114509]?=- Hδ emission-line
flux (Hd_flux)
424-432 F9.3 10-22W/m2 e_FHd [0.006/39719]?=- FHd uncertainty (Hd_err)
434-440 F7.3 0.1nm EWHd [-45.6/-0.001]?=- Hδ equivalent
width (Hd_EW)
442-446 F5.3 0.1nm e_EWHd [0.002/9]?=- EWHd uncertainty (HdEWerr)
448-456 F9.3 10-22W/m2 FHg [0.1/19018]?=- Hγ emission-line
flux (Hg_flux)
458-468 F11.3 10-22W/m2 e_FHg [0.01/9.8e+06]?=- FHg uncertainty
(Hg_err)
470-476 F7.3 0.1nm EWHg [-60.3/-0.01]?=- Hγ equivalent
width (Hg_EW)
478-487 F10.3 0.1nm e_EWHg [0.004/172142]?=- EWHg uncertainty
(HgEWerr)
489-496 F8.3 10-22W/m2 FHb [0.05/4235]?=- Hβ emission-line
flux (Hb_flux)
498-505 F8.3 10-22W/m2 e_FHb [0.02/2182]?=- FHb uncertainty (Hb_err)
507-513 F7.3 0.1nm EWHb [-41.1/-0.001]?=- Hβ equivalent
width (Hb_EW)
515-520 F6.3 0.1nm e_EWHb [0.005/22.5]?=- EWHb uncertainty
(HbEWerr)
522-530 F9.3 10-22W/m2 FOII3727 [1/25273]?=- [OII] emission-line flux
(OII3727flux)
532-540 F9.3 10-22W/m2 e_FOII3727 [0.2/46099]?=- FOII3727 uncertainty
(OII3727err)
542-549 F8.3 0.1nm EWOII3727 [-125.1/-0.05]?=- [OII] equivalent width
(OII3727EW)
551-556 F6.3 0.1nm e_EWOII3727 [0.004/12]?=- EWOII3727 uncertainty
(OII3727EW_err)
558-565 F8.3 10-22W/m2 FOIII4959 [0.07/5612]?=- [OIII]4959 emission-line
flux (OIII4959flux)
567-575 F9.3 10-22W/m2 e_FOIII4959 [0.008/89204]?=- FOIII4959 uncertainty
(OIII4959err)
577-583 F7.3 0.1nm EWOIII4959 [-58.2/-0.01]?=- [OIII]4959 equivalent
width (OIII4959EW)
585-592 F8.3 0.1nm e_EWOIII4959 [0.02/1190]?=- EWOIII4959 uncertainty
(OIII4959EW_err)
594-602 F9.3 10-22W/m2 FOIII5007 [0.1/10524]?=- [OIII]5007 emission-line
flux (OIII5007flux)
604-611 F8.3 10-22W/m2 e_FOIII5007 [0.06/3235]?=- FOIII5007 uncertainty
(OIII5007err)
613-619 F7.3 0.1nm EWOIII5007 [-99.4/-0.03]?=- [OIII]5007 equivalent
width (OIII5007EW)
621-625 F5.3 0.1nm e_EWOIII5007 [0.002/7]?=- [OIII]5007 uncertainty
(OIII5007EW_err)
627 I1 --- Fppxf [0/1] pPXF fit quality flag (0: good fit)
(f_ppxf)
629 I1 --- f_z [0/1] Redshift flag
(0=redshift detected)
631 I1 --- Fsp [0/1] Spectral quality flag
(0=good spectrum) (f_spec)
633 I1 --- Fprim [0/1] Primary source flag
(1=source primary) (f_primary)
635 I1 --- Use [0/1] General quality flag
(1=good to use) (f_use)
637 I1 --- Fint [0/1] Interpretation flag
(0=no issues) (f_int)
639-646 F8.4 --- Tcor [2.9/220.1]? Total completeness
correction
648-654 F7.1 pix-1 S/N [0.2/57083]? Overall median S/N (SN)
656-662 F7.1 pix-1 SN4000 [0/73431]? S/N at rest-frame 4000Å
(SNRF4000)
664-670 F7.1 pix-1 SN8030 [0/53043]? S/N at observed frame 8030Å
(SNOBS8030)
--------------------------------------------------------------------------------
History:
FITS catalogue downloaded from http://www.eso.org/qi/catalog/show/235/
Spectra downloaded from http://www.mpia.de/home/legac/
References:
van der Wel et al. Paper I. 2016ApJS..223...29V 2016ApJS..223...29V
(End) Emmanuelle Perret [CDS] 18-Feb-2019