The IRAS 1 Jy survey of ultraluminous infrared galaxies. I. The sample and luminosity function.
KIM D.-C. and SANDERS D.B.
Abstract (from CDS):
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 = 1012.90L☉, and the maximum redshift is z = 0.268. The luminosity function for ULIGs over the decade luminosity range Lir = 1012-1013L☉ 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.
Galaxies: Clusters: General - Galaxies: Evolution - Galaxies: Luminosity Function, Mass Function - Infrared: Galaxies - Surveys