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The galexis^(4)g uv-ir color-color diagram: catching spiral galaxies away from the blue sequence



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Bouquin, Alexandre Y. K. and Gil de Paz, Armando and Boissier, Samuel and Muñoz Mateos, Juan Carlos and Sheth, Kartik and Zaritsky, Dennis and Laine, Jarkko and Gallego Maestro, Jesús and Peletier, Reynier F. and Roeck, Benjamin R. and Knapen, Johan H. (2015) The galexis^(4)g uv-ir color-color diagram: catching spiral galaxies away from the blue sequence. Astrophysical journal letters, 800 (1). ISSN 2041-8205

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Official URL: http://dx.doi.org/10.1088/2041-8205/800/1/L19


We obtained GALEX FUV, NUV, and Spitzer/ IRAC 3.6 μm photometry for > 2000 galaxies, available for 90% of the S^(4)G sample. We find a very tight. GALEX blue sequence (GBS) in the (FUV- NUV) versus (NUV-[3.6]) color- color diagram, which is populated by irregular and spiral galaxies, and is mainly driven by changes in the formation timescale (tau) and a degeneracy between (tau) and dust reddening. The tightness of the GBS provides an unprecedented way of identifying star- forming galaxies and objects that are just evolving to (or from) what we call the. GALEX green valley (GGV). At the red end of the GBS, at (NUV-[3.6]) > 5, we find a wider. GALEX red sequence (GRS) mostly populated by E/ S0 galaxies that has a perpendicular slope to that of the GBS and of the optical red sequence. We find no such dichotomy in terms of stellar mass (measured by M_([3.6])) since both massive (M. > 10^(11)M.) blue- and red- sequence galaxies are identified. The type that is proportionally more often found in the GGV is the S0- Sa's, and most of these are located in high- density environments. We discuss evolutionary models of galaxies that show a rapid transition from the blue to the red sequence on a timescale of 10^(8) yr.

Item Type:Article
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© 2015. The American Astronomical Society. All rights reserved. The NRAO is a facility of the NSF operated under cooperative agreement by Associated Universities, Inc. We acknowledge financial support to the DAGAL network from the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme FP7/2007-2013/ under REA grant agreement number PITN-GA-2011-289313. J.H.K. acknowledges financial support from the Spanish MINECO under grant number AYA2013-41243-P. A.G.d.P. and J.G. acknowledge financial support under grant number AYA2012-30717.

Uncontrolled Keywords:Stellar structure; Spitzer survey; Evolution; Ultraviolet; S^(4)G
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:29180
Deposited On:21 Apr 2015 11:41
Last Modified:10 Dec 2018 15:05

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