IR Spectroscopy of Massive Galaxies at z>2

Details IR Spectroscopy of Massive Galaxies at z>2 IR Spectroscopy of Massive Galaxies at z>2

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30327f&link_type=abstract

Spitzer Proposal ID #30327

Physics

Scientific paper

More and more galaxies at z>2 are detected at 24 micron. Energy sources which power the emission at 24micron remain unknown for most of those galaxies. Previous IRS studies of objects at high red shifts focused on extreme red and 24 micron luminous objects, and found that most of them are AGN. We propose IRS observations on a sample of massive galaxies at 2.510^11 solar mass, f(24micron)>0.5 mJy, and f(20cm)>0.02mJy. That most massive galaxies are detected at 24micron implies a rapid star formation occuring on these galaxies. The high star formation rate helps to explain the formation of massive galaxies at high redshifts. Nevertheless AGN contribution to the 24micron flux cannot be ruled out. The IRS spectroscopy is essential in understanding various energy sources contributing to the 24micron flux of massive galaxies. Combining both the PAH emission flux at 7.7mu and the 20cm flux density, we will be able to obtain a better star formation rate for these massive galaxies.

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