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2011MNRAS.412..145H - Mon. Not. R. Astron. Soc., 412, 145-160 (2011/March-3)
ACCESS – III. The nature of star formation in the Shapley supercluster.
HAINES C.P., BUSARELLO G., MERLUZZI P., SMITH R.J., RAYCHAUDHURY S., MERCURIO A. and SMITH G.P.
Abstract (from CDS):
We observe a robust bimodality in the infrared (f_24 µm_/fK) galaxy colours, which we are able to identify as another manifestation of the broad split into star-forming spiral and passive elliptical galaxy populations seen in UV-optical surveys. This diagnostic also allows the identification of galaxies in the process of having their star formation quenched as the infrared analogue to the ultraviolet `green valley' population. The bulk of supercluster galaxies on the star-forming sequence have specific-SFRs consistent with local field specific-SFR-{img} relations of [Elbaz et al. (2007)], and form a tight FIR-radio correlation (0.24 dex) confirming that their FIR emission is due to star formation. We show that 85 per cent of the global SFR is quiescent star formation within spiral discs, as manifest by the observed sequence in the (LIR/FFUV)-(FUV-NUV) plane - the IRX (infrared-to-ultraviolet ratio)-β relation - being significantly offset from the starburst relation of [Kong et al. (2004)], while their FIR-radio colours indicate dust heated by low-intensity star formation. Just 15 per cent of the global SFR is due to nuclear starbursts. The vast majority of star formation seen in cluster galaxies comes from normal infalling spirals that have yet to be affected by the cluster environment.
Abstract Copyright: 2010 The Authors Monthly Notices of the Royal Astronomical Society2010 RAS
Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: A3556 - galaxies: clusters: individual: A3558 - galaxies: clusters: individual: A3562 - galaxies: evolution - galaxies: stellar content
Simbad objects: 13
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