Confirming a population of hot-dust dominated, star-forming, ultraluminous galaxies at high redshift
Abstract
We identify eight z > 1 radio sources undetected at 850 μm but robustly detected at 70 μm, confirming that they represent ultraluminous infrared galaxies (ULIRGs) with hotter dust temperatures (〈T_d〉= 52 ± 10 K) than submillimetre galaxies (SMGs) at similar luminosities and redshifts. These galaxies share many properties with SMGs: ultraviolet spectra consistent with starbursts, high stellar masses and radio luminosities. We can attribute their radio emission to star formation since high-resolution Multi-Element Radio Linked Interferometer Network (MERLIN) radio maps show extended emission regions (with characteristic radii of 2–3 kpc), which are unlikely to be generated by active galactic nucleus (AGN) activity. These observations provide the first direct confirmation of hot, dusty ULIRGs which are missed by current submillimetre surveys. They have significant implications for future observations from the Herschel Space Observatory and Submillimetre Common-User Bolometer Array 2 (SCUBA2), which will select high-redshift luminous galaxies with less selection biases.
Additional Information
© 2009 The Authors. Journal compilation © 2009 RAS. Accepted 2009 June 19. Received 2009 June 19; in original form 2008 May 26. We thank the anonymous referee for helpful comments which improved the paper. This work is based, in part, on observations made with MERLIN, a National Facility operated by the University of Manchester at Jodrell Bank Observatory on behalf of STFC, and the VLA of the National Radio Astronomy Observatory, a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. CMC thanks the Gates-Cambridge Trust, and IRS thanks STFC for support.Attached Files
Published - Casey2009p6265Mon_Not_R_Astron_Soc.pdf
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Additional details
- Eprint ID
- 16674
- Resolver ID
- CaltechAUTHORS:20091111-144225085
- University of Manchester
- National Radio Astronomy Observatory
- NSF
- Associated Universities, Inc.
- Gates-Cambridge Trust
- Science and Technology Facilities Council (STFC)
- Created
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2009-11-16Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field