Back to Volume
Paper: Confirmation of a Dominating Hot-Dust Component in z~2 Star Forming ULIRGs
Volume: 408, The Starburst−AGN Connection
Page: 393
Authors: Casey, C.M.
Abstract: We present observations of distant radio galaxies, undetected at 850μ m and 1200μ m but robustly detected at 70μ m, confirming that they represent ultraluminous infrared galaxies (ULIRGs) with hotter dust temperatures (d >=52±10 K) than SMGs of similar luminosities. These galaxies share many properties with SMGs and local ULIRGs: ultra-violet (UV) spectra consistent with starbursts, high stellar masses and radio luminosities, and comparable AGN content. We can attribute their radio emission to star formation since high-resolution MERLIN radio maps show extended emission regions (~8 kpc), which are unlikely to be generated by AGN activity. Detections in CO molecular gas provide further evidence of the vast gas reservoirs powering their starbursts. These observations have significant implications for future Herschel Space Observatory and SCUBA2 science through the prospect of detecting many hotter-dust ULIRGs that sit below current far-IR/submm detection limits. These galaxies may substantially increase the volume density of known ULIRGs at z~2, change our view of galaxy evolution in high-luminosity systems, and give more clues to the ULIRGs’ role in the AGN-Starburst connection.
Back to Volume