Mid-IR spectroscopy of suspected very hot dusty, high-z galaxies

Details Mid-IR spectroscopy of suspected very hot dusty, high-z galaxies Mid-IR spectroscopy of suspected very hot dusty, high-z galaxies

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20767c&link_type=abstract

Spitzer Proposal ID #20767

Computer Science

Scientific paper

We have identified a population of high-redshift microJy radio sources which have optical and near-IR photometric and spectroscopic properties characteristic of dusty luminous starbursts, and whose radio emission is as intense as expected from this class of galaxy, but which have no detectable submm emission from cool dust. As these galaxies are detected with ~0.5mJy 24micron fluxes, we propose that they are a new class of luminous dusty starbursts with characteristic dust temperatures that are hotter than the similarly high-redshift ultraluminous submillimeter-selected galaxies (SMGs) identified in deep submm surveys. The radio emission from these submm-faint radio galaxies indicates far-IR luminosities that are comparable to those of the SMGs. We propose Spitzer IRS observations of 6 of these galaxies to to probe the intense mid-IR emission from these galaxies for signatures of their power source. We expect that large numbers of these galaxies will be detected in mid-IR Spitzer surveys, and we can rapidly and efficiently define their observational characteristics by exploiting our existing radio-selected spectroscopic sample.

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