IDENTIFICATION OF A COMPLETE 160 {mu}m FLUX-LIMITED SAMPLE OF INFRARED GALAXIES IN THE ISO LOCKMAN HOLE 1 deg{sup 2} DEEP FIELDS: SOURCE PROPERTIES AND EVIDENCE FOR STRONG EVOLUTION IN THE FIR LUMINOSITY FUNCTION FOR ULIRGs
- Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States)
We have identified a complete, flux-limited (S{sub 160}>120 mJy) sample of 160 {mu}m selected sources from Spitzer observations of the 1 deg{sup 2} Infrared Space Observatory (ISO) Deep Field region in the Lockman Hole (LH). Ground-based UV, optical, and near-infrared (NIR) photometry and optical spectroscopy have been used to determine colors, redshifts, and masses for the complete sample of 40 galaxies. Spitzer-IRAC+MIPS photometry, supplemented by ISOPHOT data at 90 {mu}m and 170 {mu}m, has been used to calculate accurate total infrared luminosities, L{sub IR}(8-1000 {mu}m), and to determine the IR luminosity function (LF) of luminous infrared galaxies (LIRGs). The maximum observed redshift is z {approx} 0.80 and the maximum total infrared luminosity is log (L{sub IR}/L{sub sun}) = 12.74. Over the luminosity range log (L{sub IR}/L{sub sun}) = 10-12, the LF for LIRGs in the LH Deep Field is similar to that found previously for local sources at similar infrared luminosities. The mean host galaxy mass, log (M/M{sub sun}) = 10.7, and dominance of H II-region spectral types, is also similar to what has been found for local LIRGs, suggesting that intense starbursts likely power the bulk of the infrared luminosity for sources in this range of L{sub IR}. However for the most luminous sources, log (L{sub IR}/L{sub sun})>12.0, we find evidence for strong evolution in the LF {proportional_to}(1 + z){sup 6{+-}1}, assuming pure number density evolution. These ultraluminous infrared galaxies (ULIRGs) have a larger mean host mass, log (M/M{sub sun}) = 11.0, and exhibit disturbed morphologies consistent with strong interactions/mergers, and they are also more likely to be characterized by starburst-active galactic nucleus (AGN) composite or AGN spectral types.
- OSTI ID:
- 21583185
- Journal Information:
- Astronomical Journal (New York, N.Y. Online), Vol. 141, Issue 4; Other Information: DOI: 10.1088/0004-6256/141/4/110; ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
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