2018ApJS..239...27S -
Astrophys. J., Suppl. Ser., 239, 27-27 (2018/December-0)
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. and SPILKER J.S.
Abstract (from CDS):
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 ≃ 20 Å–1 of galaxies at 0.6 <= z <= 1.0, each observed for ∼20 hr 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 ∼150 km s–1 and strong Hδ absorption (HδA ∼ 5 Å), while passive galaxies have higher observed stellar velocity dispersions (∼200 km s–1) and weak Hδ absorption (HδA ∼ 0 Å). Strong [O III]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. By making the spectra and value-added catalogs publicly available we encourage the community to take advantage of this very substantial investment in telescope time provided by ESO.
Abstract Copyright:
© 2018. The American Astronomical Society. All rights reserved.
Journal keyword(s):
catalogs - galaxies: evolution - surveys - techniques: spectroscopic
VizieR on-line data:
<Available at CDS (J/ApJS/239/27): legacdr2.dat sp/*>
Simbad objects:
1784
Full paper
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