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2011MNRAS.410..573G - Mon. Not. R. Astron. Soc., 410, 573-584 (2011/January-1)
Luminosity functions of local infrared galaxies with AKARI: implications for the cosmic star formation history and AGN evolution.
GOTO T., ARNOUTS S., INAMI H., MATSUHARA H., PEARSON C., TAKEUCHI T.T., LE FLOC'H E., TAKAGI T., WADA T., NAKAGAWA T., OYABU S., ISHIHARA D., LEE H.M., JEONG W.-S., YAMAUCHI C., SERJEANT S., SEDGWICK C. and TREISTER E.
Abstract (from CDS):
By fitting modern IR spectral energy distribution (SED) models, we have remeasured LTIR of the IRAS Revised Bright Galaxy Sample, which is a complete sample of local galaxies with S_60 µm_> 5.24 Jy.
We present mid-IR monochromatic luminosity (νLν) to LTIRcorrelations for Spitzer8 µm, AKARI9 µm, IRAS12 µm, WISE12 µm, ISO15 µm, AKARI18 µm, WISE22 µm and Spitzer24 µm filters. These measures of LMIR are well correlated with LTIR, with scatter in the range 13-44 per cent. The best-fitting LMIR-to-LTIR conversions provide us with estimates of LTIR using only a single MIR band, in which several deep all-sky surveys are becoming available such as AKARI MIR and WISE.
Although we have found some overestimates of LTIR by IRAS due to contaminating cirrus/sources, the resulting AKARI IR luminosity function (LF) agrees well with that from IRAS. We integrate the LF weighted by LTIR to obtain a cosmic IR luminosity density of ΩTIR= (8.5+1.5–2.3) {x} 107 L☉/Mpc3, of which 7±1 per cent is produced by luminous infrared galaxies (LIRGs) (LTIR> 1011 L☉), and only 0.4 ±0.1 per cent is from ultraluminous infrared galaxies (ULIRGs) (LTIR > 1012 L☉) in the local Universe, in stark contrast to high-redshift results.
We separate the contributions from AGN and star-forming galaxies (SFGs). The SFG IR LF shows a steep decline at the bright end. Combined with high-redshift results from the AKARI NEP deep survey, these data show a strong evolution of ΩSFTIR∝ (1 +z)4.0±0.5 and ΩAGNTIR∝ (1 +z)4.4±0.4. For ΩAGNTIR, the ULIRG contribution exceeds that from LIRGs already by z ∼ 1. A rapid evolution in both ΩAGNTIR and ΩSFGTIRsuggests the correlation between star formation and black hole accretion rate continues up to higher redshifts. We compare the evolution of ΩAGNTIRto that of X-ray luminosity density. The ΩAGNTIR/Ω_X-ray_ AGN ratio shows a possible increase at z > 1, suggesting an increase of obscured AGN at z > 1.
Abstract Copyright: 2010 The Authors Monthly Notices of the Royal Astronomical Society2010 RAS
Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: interactions - galaxies: peculiar - galaxies: starburst - infrared: galaxies
Simbad objects: 1
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