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Stellar population properties for 2 million galaxies from SDSS DR14 and DEEP2 DR4 from full spectral fitting

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Author(s)

Johan Comparat, Claudia Maraston, Daniel Goddard, Violeta Gonzalez-Perez, Jianhui Lian, Sofia Meneses-Goytia, Daniel Thomas, Joel R. Brownstein, Rita Tojeiro, Alexis Finoguenov, Andrea Merloni, Francisco Prada, Mara Salvato, Guangtun B. Zhu, Hu Zou, Jonathan Brinkmann

School/Research organisations

Abstract

We determine the stellar population properties - age, metallicity, dust reddening, stellar mass and the star formation history - for all spectra classified as galaxies that were published by the Sloan Digital Sky Survey (SDSS data release 14) and by the DEEP2 (data release 4) galaxy surveys. We perform full spectral fitting on individual spectra, making use of high spectral resolution stellar population models. Calculations are carried out for several choices of the model input, including three stellar initial mass functions and three input stellar libraries to the models. We study the accuracy of parameter derivation, in particular the stellar mass, as a function of the signal-to-noise of the galaxy spectra. We find that signal to noise ratio per pixel around 20 (5) allow a statistical accuracy on log10(M∗/M⊙) of 0.2 (0.4) dex, for the Chabrier IMF. We obtain the galaxy stellar mass function probed by SDSS, eBOSS and DEEP2 for galaxies with 0.2<z<0.8. We study DEEP2 galaxies selected by their \OII luminosity in the redshift range 0.83<z<1.03, finding that they have stellar masses with a flat number density in the range 109<M/M⊙<1011.5. We publish all catalogs of properties as well as model spectra of the continuum for these galaxies as a value added catalog of the fourteenth data release of the SDSS. This catalog is about twice as large as its predecessors (DR12) and will hopefully aid a variety of studies on galaxy evolution and cosmology.
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Original languageEnglish
JournalAstronomy & Astrophysics
Publication statusSubmitted - 16 Nov 2017

    Research areas

  • Galaxy evolution, Stellar population model, Galaxy surveys

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