Bibcode
Bouquin, A. Y. K.; Gil de Paz, Armando; Boissier, Samuel; Muñoz-Mateos, Juan-Carlos; Sheth, Kartik; Zaritsky, Dennis; Laine, Jarkko; Gallego, Jesús; Peletier, Reynier F.; Röck, B. R.; Knapen, J. H.
Referencia bibliográfica
The Astrophysical Journal Letters, Volume 800, Issue 1, article id. L19, 6 pp. (2015).
Fecha de publicación:
2
2015
Número de citas
16
Número de citas referidas
14
Descripción
We obtained GALEX FUV, NUV, and Spitzer/IRAC 3.6 μm photometry for
\gt 2000 galaxies, available for 90% of the S4G 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 (τ) and a degeneracy between τ 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]) \gt 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}\star }\gt
{{10}11}{{M}ȯ }) 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 108 yr.
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