2026-06-27T06:05:18Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/229882024-09-12T13:36:36Zcom_20.500.14352_14col_20.500.14352_15

Bouquin, Alexandre Y. K. Gil De Paz, Armando Boissier, Samuel Muñoz Mateos, Juan Carlos Sheth, Kartik Zaritsky, Dennis Laine, Jarkko Gallego Maestro, Jesús Peletier, Reynier F. Roeck, Benjamin R. Knapen, Johan H. 2023-06-18T05:40:37Z 2023-06-18T05:40:37Z 2015-02-10 2041-8205 10.1088/2041-8205/800/1/L19 https://hdl.handle.net/20.500.14352/22988 http://dx.doi.org/10.1088/2041-8205/800/1/L19 http://iopscience.iop.org/ 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. eng open access The galexis^(4)g uv-ir color-color diagram: catching spiral galaxies away from the blue sequence journal article