Other
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50608g&link_type=abstract
Spitzer Proposal ID #50608
Other
Scientific paper
We propose low resolution mid-IR spectroscopy of members of the rich cluster MS0451-03 at z=0.55 which are bright at 24um, and fall in the luminous infrared galaxy class (LIRG). This cluster is not as rich in active galaxies as others we have studied at this redshift, and we postulate that this cluster-to-cluster scatter could be partially due to the varying efficiency of processes related to global cluster properties on quenching star formation in infalling field spirals. We will test whether the LIRGs in MS0451-03 are powered by starbursts or active galactic nuclei (AGN), and whether their properties differ from an identically selected sample in the cluster CL0024+16, containing a larger population of LIRGs. If the hot ICM of MS0451-03 is more effective at switching off star formation (e.g. via ram pressure stripping), then these LIRGs may be the most gas-rich or intensely star forming galaxies that have survived cluster infall. We may also expect a higher fraction of AGN, since these are likely to be more difficult to `switch-off' via pressure stripping. Understanding the nature of LIRGs in distant clusters is important, because these galaxies are a potential progenitor population of S0 galaxies, abundant in the cores of local rich clusters.
Edge Alastair
Ellis Richard
Geach James
Moran Sean
Smail Ian
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