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2011MNRAS.417.2831H - Mon. Not. R. Astron. Soc., 417, 2831-2845 (2011/November-2)
ACCESS – IV. The quenching of star formation in a cluster population of dusty S0s.
HAINES C.P., MERLUZZI P., BUSARELLO G., DOPITA M.A., SMITH G.P., LA BARBERA F., GARGIULO A., RAYCHAUDHURY S. and SMITH R.J.
Abstract (from CDS):
We find that almost every cluster galaxy in the process of star formation quenching is already either an S0 or Sa, while we find no passive galaxies of class Sb or later. Hence the formation of passive early-type galaxies in cluster cores must involve the prior morphological transformation of late-type spirals into Sa/S0s, perhaps via pre-processing or the impact of cluster tidal fields, before a subsequent quenching of star formation once the lenticular encounters the dense environment of the cluster core. In the cases of many cluster S0s, this phase of star formation quenching is characterized by an excess of 70-µm emission, indicating that the cold dust content is declining at a slower rate than star formation. We suggest that the excess 70-µm emission during quenching is due to either (i) a reduction of the star formation efficiency as proposed within the morphological quenching scenario or (ii) a 2–3 times increase in the dust-to-gas ratio or metallicity of the remaining interstellar medium, as predicted by chemical evolutionary models of galaxies undergoing ram-pressure stripping or starvation.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: A3558 - galaxies: clusters: individual: A3562 - galaxies: evolution - galaxies: star formation - infrared: galaxies
Simbad objects: 38
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