Computer Science
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30621g&link_type=abstract
Spitzer Proposal ID #30621
Computer Science
Scientific paper
We propose to use low-resolution IRS spectroscopy to obtain mid-infrared spectra of a representative sample of 13 spectroscopically confirmed members of the cluster Cl0024+16 at z=0.4. We have detected these galaxies at 24um with fluxes >0.6 mJy in a previous MIPS program, implying far-infrared luminosities putting them in the LIRG class. We have demonstrated that the luminous mid-infrared population in rich clusters evolves rapidly with look-back time, at a rate comparable to that in the surrounding field. Our aim is to use the IRS spectra to understand the origin of the mid-infrared emission - either from intense dust-enshrouded star-formation, an active galactic nucleus (AGN), or a combination of both. If we confirm that the mid-infrared emission is produced by star-formation, then these sources would be starbursts with implied star-formation rates of 10s-100 Solar masses per year. This population is missed in optical surveys due to dust obscuration, although such levels of obscured activity are needed to transform the bulge-weak spiral populations which are seen in distant clusters into the bulge-strong S0 populations which dominate such environments locally.
Edge Alastair
Ellis Richard
Geach James
Moran Sean
Smail Ian
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