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2011MNRAS.414.1903G - Mon. Not. R. Astron. Soc., 414, 1903-1913 (2011/July-1)
Infrared luminosity functions of AKARI Sloan digital sky survey galaxies.
GOTO T., ARNOUTS S., MALKAN M., TAKAGI T., INAMI H., PEARSON C., WADA T., MATSUHARA H., YAMAUCHI C., TAKEUCHI T.T., NAKAGAWA T., OYABU S., ISHIHARA D., SANDERS D.B., LE FLOC'H E., LEE H.M., JEONG W.-S., SERJEANT S. and SEDGWICK C.
Abstract (from CDS):
Using this LIR, we constructed the luminosity functions (LF) of IR galaxies at a median redshift of z= 0.031. The LF agrees well with that at z= 0.0082 (the Revised Bright Galaxy Sample), showing smooth and continuous evolution towards higher redshift LFs measured in the AKARI North Ecliptic Pole (NEP) deep field. By integrating the IR LF weighted by LIR, we measured the local cosmic IR luminosity density of ΩIR= (3.8+5.8–1.2) {x} 108 L☉/Mpc3. We separate galaxies into active galactic nuclei (AGN), star-forming galaxies (SFG) and composite by using the [N II]/Hα versus [O III]/Hβ line ratios. The fraction of AGN shows a continuous increase with increasing LIR from 25 to 90 per cent at 9 < log LIR< 12.5. The SFRHα and L[OIII] show good correlations with LIR for SFG and AGN, respectively. The self-absorption-corrected Hα/Hβ ratio shows a weak increase with LIR with a substantial scatter. When we separate IR LFs into contributions from AGN and SFG, the AGN contribution becomes dominant at LIR> 1011 L☉, coinciding with the break of both the SFG and AGN IR LFs. At LIR ≤ 1011 L☉, SFG dominates IR LFs. Only 1.1±0.1 per cent of ΩIR is produced by luminous infrared galaxies (LIR> 1011 L☉), and only 0.03±0.01 per cent by ultraluminous infrared galaxies (LIR> 1012 L☉) in the local Universe. Compared with high-redshift results from the AKARI NEP deep survey, we observed a strong evolution of ΩSFGIR∝ (1 +z)4.1±0.4 and ΩAGNIR∝ (1 +z)4.1±0.5. Our results show that all of our measured quantities (IR LFs, L*, ΩAGNIR, ΩSFGIR) show smooth and steady increase from lower redshift (the Revised Bright Galaxy Sample) to higher redshift (the AKARI NEP deep survey).
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: interactions - galaxies: peculiar - galaxies: starburst - infrared: galaxies
Simbad objects: 1
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