期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 399, 期 1, 页码 121-128出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2009.15291.x
关键词
galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: starburst; cosmology: observations
资金
- University of Manchester
- National Radio Astronomy Observatory
- National Science Foundation
- Associated Universities, Inc.
- STFC [ST/H001913/1, PP/E00105X/1, ST/F002963/1, ST/G004633/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G004633/1, ST/H001913/1, ST/F002963/1, PP/E00105X/1, PP/E001181/1] Funding Source: researchfish
We identify eight z > 1 radio Sources undetected at 850 mu m but robustly detected at 70 mu m, 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.
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