TheIRAS1 Jy Survey of Ultraluminous Infrared Galaxies. I. The Sample and Luminosity Function
Open Access
- 1 November 1998
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal Supplement Series
- Vol. 119 (1), 41-58
- https://doi.org/10.1086/313148
Abstract
A complete flux-limited sample of 118 ultraluminous infrared galaxies (ULIGs) has been identified from the IRAS Faint Source Catalog (FSC). The selection criteria were a 60 μm flux density greater than 1 Jy in a region of the sky δ > -40°, |b| > 30°. All sources were subsequently reprocessed using co-added IRAS maps in order to obtain the best available flux estimates in all four IRAS wavelength bands. The maximum observed infrared luminosity is Lir = 1012.90 L☉, and the maximum redshift is z = 0.268. The luminosity function for ULIGs over the decade luminosity range Lir = 1012-1013 L☉ can be approximated by a power law Φ(L) ∝ L-2.35[Mpc-3 mag-1]. In the local universe (z 0.1), the space density of ULIGs appears to be comparable to or slightly larger than that of optically selected QSOs at comparable bolometric luminosities. A maximum likelihood test suggests strong evolution for our sample; assuming density evolution proportional to (1 + z)α we find α = 7.6 ± 3.2. Examination of the two-point correlation function shows a barely significant level of clustering, ξ(r) = 1.6 ± 1.2, on size scales r ~ 22 h-1 Mpc.Keywords
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