IRS Spectroscopy and Multi-wavelength Study of Luminous Star-forming Galaxies at Z 1.9

Astronomy and Astrophysics – Astronomy

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Scientific paper

IRS spectroscopy of galaxies selected to have F24μm > 0.5 mJy and satisfying an IRAC color criterion gives a sample of massive, star-forming galaxies at z /= 1.9. This sample has the highest PAH to total infrared luminosity ratio among all known populations including local starburst galaxies, local ULIRGs, and MIPS 24 μm luminous sources at z 2. This is the first starburst-dominated ULIRG sample at high redshifts with total infrared luminosity directly measured from FIR and millimeter photometry.
With deep 1.4 GHz radio data, we establish the FIR-radio relation for ULIRGs at z 1.9, which is consistent with the local one. This relation confirms the measurement of total infrared luminosities for the sample. Though this is a 24μm-selected sample,
the predicted submillimeter flux densities suggests that this sample is part of a large faint submillimeter galaxy population.
Star formation rates inferred from both 7.7 and 11.3 μm PAH luminosities for this sample are in the range of 200

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