The GALEX/S4G Surface Brightness and Color Profiles Catalog. I. Surface Photometry and Color Gradients of Galaxies
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 b...
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ndltd-arizona.edu-oai-arizona.openrepository.com-10150-6270452018-03-16T03:00:28Z The GALEX/S4G Surface Brightness and Color Profiles Catalog. I. Surface Photometry and Color Gradients of Galaxies Bouquin, Alexandre Y. K. Gil de Paz, Armando Muñoz-Mateos, Juan Carlos Boissier, Samuel Sheth, Kartik Zaritsky, Dennis Peletier, Reynier F. Knapen, Johan H. Gallego, Jesús Univ Arizona, Steward Observ catalogs galaxies: photometry galaxies: star formation infrared: galaxies ultraviolet: galaxies Supporting material: machine-readable tables 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. 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]) = 20.89 mag arcsec(-2), or below 3 x 10(8) M-circle dot 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. 2018-01-25 Article The GALEX/S4G Surface Brightness and Color Profiles Catalog. I. Surface Photometry and Color Gradients of Galaxies 2018, 234 (2):18 The Astrophysical Journal Supplement Series 1538-4365 10.3847/1538-4365/aaa384 http://hdl.handle.net/10150/627045 http://arizona.openrepository.com/arizona/handle/10150/627045 The Astrophysical Journal Supplement Series en http://stacks.iop.org/0067-0049/234/i=2/a=18?key=crossref.c221e5af64eb5cb3be167569ab26dd2c © 2018. The American Astronomical Society. All rights reserved. IOP PUBLISHING LTD |
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catalogs galaxies: photometry galaxies: star formation infrared: galaxies ultraviolet: galaxies Supporting material: machine-readable tables |
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catalogs galaxies: photometry galaxies: star formation infrared: galaxies ultraviolet: galaxies Supporting material: machine-readable tables Bouquin, Alexandre Y. K. Gil de Paz, Armando Muñoz-Mateos, Juan Carlos Boissier, Samuel Sheth, Kartik Zaritsky, Dennis Peletier, Reynier F. Knapen, Johan H. Gallego, Jesús The GALEX/S4G Surface Brightness and Color Profiles Catalog. I. Surface Photometry and Color Gradients of Galaxies |
description |
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. 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]) = 20.89 mag arcsec(-2), or below 3 x 10(8) M-circle dot 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. |
author2 |
Univ Arizona, Steward Observ |
author_facet |
Univ Arizona, Steward Observ Bouquin, Alexandre Y. K. Gil de Paz, Armando Muñoz-Mateos, Juan Carlos Boissier, Samuel Sheth, Kartik Zaritsky, Dennis Peletier, Reynier F. Knapen, Johan H. Gallego, Jesús |
author |
Bouquin, Alexandre Y. K. Gil de Paz, Armando Muñoz-Mateos, Juan Carlos Boissier, Samuel Sheth, Kartik Zaritsky, Dennis Peletier, Reynier F. Knapen, Johan H. Gallego, Jesús |
author_sort |
Bouquin, Alexandre Y. K. |
title |
The GALEX/S4G Surface Brightness and Color Profiles Catalog. I. Surface Photometry and Color Gradients of Galaxies |
title_short |
The GALEX/S4G Surface Brightness and Color Profiles Catalog. I. Surface Photometry and Color Gradients of Galaxies |
title_full |
The GALEX/S4G Surface Brightness and Color Profiles Catalog. I. Surface Photometry and Color Gradients of Galaxies |
title_fullStr |
The GALEX/S4G Surface Brightness and Color Profiles Catalog. I. Surface Photometry and Color Gradients of Galaxies |
title_full_unstemmed |
The GALEX/S4G Surface Brightness and Color Profiles Catalog. I. Surface Photometry and Color Gradients of Galaxies |
title_sort |
galex/s4g surface brightness and color profiles catalog. i. surface photometry and color gradients of galaxies |
publisher |
IOP PUBLISHING LTD |
publishDate |
2018 |
url |
http://hdl.handle.net/10150/627045 http://arizona.openrepository.com/arizona/handle/10150/627045 |
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