GALEX/S4G surface brightness profiles. I. Virtual Observatory Resource

Authors
  1. Bouquin A.Y.K.
  2. Gil de Paz A.
  3. Munoz-Mateos J.C.
  4. Boissier S.
  5. Sheth K.,Zaritsky D.
  6. Peletier R.F.
  7. Knapen J.H.
  8. Gallego J.
  9. Published by
    CDS
Abstract

We present new spatially resolved surface photometry in the far-ultraviolet (FUV) and near-ultraviolet (NUV) from images obtained by the Galaxy Evolution Explorer (GALEX) and IRAC1 (3.6{mu}m) photometry from the Spitzer Survey of Stellar Structure in Galaxies (S^4^G). We analyze the radial surface brightness profiles {mu}FUV, {mu}NUV, and {mu}[3.6], as well as the radial profiles of (FUV-NUV), (NUV-[3.6]), and (FUV-[3.6]) colors in 1931 nearby galaxies (z<0.01). The analysis of the 3.6 {mu}m surface brightness profiles also allows us to separate the bulge and disk components in a quasi-automatic way and to compare their light and color distribution with those predicted by the chemo-spectrophotometric models for the evolution of galaxy disks of Boissier & Prantzos (2000MNRAS.312..398B). The exponential disk component is best isolated by setting an inner radial cutoff and an upper surface brightness limit in stellar mass surface density. The best-fitting models to the measured scale length and central surface brightness values yield distributions of spin and circular velocity within a factor of two of those obtained via direct kinematic measurements. We find that at a surface brightness fainter than {mu}[3.6]=20.89mag arcsec^-2^, or below 3x10^8^M_{sun}_/kpc^2^ in stellar mass surface density, the average specific star formation rate (sSFR) for star-forming and quiescent galaxies remains relatively flat with radius. However, a large fraction of GALEX Green Valley galaxies show a radial decrease in sSFR. This behavior suggests that an outside-in damping mechanism, possibly related to environmental effects, could be testimony of an early evolution of galaxies from the blue sequence of star-forming galaxies toward the red sequence of quiescent galaxies.

Keywords
  1. galaxies
  2. infrared-sources
  3. ultraviolet-photometry
  4. galaxy-classification-systems
  5. surveys
Bibliographic source Bibcode
2018ApJS..234...18B
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/234/18
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJS/234/18
Document Object Identifer DOI
doi:10.26093/cds/vizier.22340018

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History

2018-04-20T12:37:36Z
Resource record created
2018-04-20T12:37:36Z
Created
2018-07-16T09:00:48Z
Updated

Contact

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Postal Address
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E-Mail
cds-question@unistra.fr