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Specific star formation rate profiles in nearby spiral galaxies : quantifying the inside-out formation of disks

Muñoz-Mateos, J. C. and Gil de Paz, A. and Boissier, S. and Zamorano, J. and Jarrett, T. and Gallego, J. and Madore, B. F. (2007) Specific star formation rate profiles in nearby spiral galaxies : quantifying the inside-out formation of disks. Astrophysical Journal, 658 (2). pp. 1006-1026. ISSN 0004-637X. doi:10.1086/511812.

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We present specific star formation rate (sSFR) radial profiles for a sample of 161 relatively face-on spiral galaxies from the GALEX Atlas of Nearby Galaxies. The sSFR profiles are derived from GALEX and 2MASS (FUV - K) color profiles after a proper SFR calibration of the UV luminosity and K-band mass-to-light ratio are adopted. The (FUV - K) profiles were first corrected for foreground Galactic extinction and later for internal extinction using the ratio of the total-infrared (TIR) to FUV emission. For those objects where TIR-to-FUV ratio radial profiles were not available, the (FUV - NUV) color profiles were used as a measure of the UV slope. The sSFR radial gradients derived from these profiles allow us to quantify the inside-out scenario for the growth of spiral disks for the first time in the local universe. We find a large dispersion in the slope of the sSFR profiles with a slightly positive mean value, which implies a moderate inside-out disk formation. There is also a strong dependency of the value of this slope on the luminosity and size of the disks, with large systems showing a uniform, slightly positive slope in almost all cases and low-luminosity small disks showing a large dispersion with both positive and negative large values. While a majority of the galaxies can be interpreted as forming stars gradually either from inside out or from outside in, a few disks require episodes of enhanced recent growth with scale lengths of the SFR (or gas infall) being significantly larger at present than in the past. We do not find any clear dependence of the sSFR gradient on the environment (local galaxy density or presence of close neighbors).

Item Type:Article
Related URLs:
URLURL TypeDescription
Gil de Paz, A.0000-0001-6150-2854
Boissier, S.0000-0002-9091-2366
Madore, B. F.0000-0002-1576-1676
Additional Information:© 2007 American Astronomical Society. Print publication: Issue 2 (2007 April 1); received 2006 September 22; accepted for publication 2006 November 29. J. C. M. M. acknowledges the receipt of a Formación del Profesorado Universitario fellowship from the Spanish Ministerio de Educación y Ciencia. J. C. M. M., A. G. d. P., J. Z., and J. G. are partially financed by the Spanish Programa Nacional de Astronomía y Astrofísica under grant AYA2003-01676. A. G. d. P. is also financed by the MAGPOP EU Marie Curie Research Training Network. We thank the anonymous referee for his/her comments that have significantly improved the paper. This publication makes use of data products from 2MASS, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. We have made also use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. Stimulating conversations with A. Aragón-Salamanca are gratefully acknowledged.
Funding AgencyGrant Number
Ministerio de Educación y Ciencia (MEC)UNSPECIFIED
Programa Nacional de Astronomía y AstrofísicaAYA2003-01676
Marie Curie FellowshipUNSPECIFIED
Subject Keywords:atlases; galaxies: photometry; galaxies: stellar content; infrared: galaxies; ultraviolet: galaxies
Issue or Number:2
Record Number:CaltechAUTHORS:20090414-115321783
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13971
Deposited By: Jason Perez
Deposited On:06 Aug 2009 20:32
Last Modified:08 Nov 2021 22:42

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