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  • 1809.08236v1

    Rights statement: This is an author-created, un-copyedited version of an article accepted for publication in The Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi: 10.3847/1538-4365/aae37a LEGA-C data-release http://www.mpia.de/home/legac/

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The Large Early Galaxy Astrophysics Census (LEGA-C) Data Release 2: Dynamical and Stellar Population Properties of z lesssim 1 Galaxies in the COSMOS Field

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  • Caroline M. S. Straatman
  • Arjen van der Wel
  • Rachel Bezanson
  • Camilla Pacifici
  • Anna Gallazzi
  • Po-Feng Wu
  • Kai Noeske
  • Ivana Barisic
  • Eric F. Bell
  • Gabriel B. Brammer
  • Priscilla Chauke
  • Marijn Franx
  • Josha van Houdt
  • Ivo Labbe
  • Michael V. Maseda
  • Juan C. Munoz-Mateos
  • Adam Muzzin
  • Jesse van de Sande
  • Justin S. Spilker
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<mark>Journal publication date</mark>5/12/2018
<mark>Journal</mark>The Astrophysical Journal
Issue number2
Volume239
Number of pages14
Pages (from-to)1-14
Publication statusPublished
Original languageEnglish

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 ~= 20 /Angstrom of galaxies at 0.6 ~< z ~< 1.0, each observed for ~20 hours 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 and strong Hdelta absorption (Hd_A ~ 5 Angstrom), while passive galaxies have higher observed stellar velocity dispersions ~200 km/s and weak Hdelta absortion (Hd_A ~ 0 Angstrom). Strong [O III]5007 / Hbeta ratios tend to occur mostly for galaxies with weak Hd_A or galaxies with higher observed velocity dispersion. Beyond these broad trends, we find a large 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.

Bibliographic note

This is an author-created, un-copyedited version of an article accepted for publication in The Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi: 10.3847/1538-4365/aae37a LEGA-C data-release http://www.mpia.de/home/legac/