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arXiv · 1008.0859

Luminosity Functions of Local Infrared Galaxies with AKARI: Implications to the Cosmic Star Formation History and AGN Evolution

Tomotsugu Goto·Stephane Arnouts·Hanae Inami·Hideo Matsuhara·Chris Pearson·Tsutomu T. Takeuchi·Emeric Le Floc'h·Toshinobu Takagi·Takehiko Wada·Takao Nakagawa·Shinki Oyabu·Daisuke Ishihara·Hyung Mok Lee·Woong-Seob Jeong·Chisato Yamauchi·Stephen Serjeant·Chris Sedgwick·Ezequiel Treister
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Abstract

Infrared (IR) luminosity is fundamental to understanding the cosmic star formation history and AGN evolution. The AKARI IR space telescope performed all sky survey in 6 IR bands (9, 18, 65, 90, 140, and 160um) with 3-10 times better sensitivity than IRAS, covering the crucial far-IR wavelengths across the peak of the dust emission. Combined with a better spatial resolution, AKARI can much more precisely measure the total infrared luminosity (L_TIR) of individual galaxies, and thus, the total infrared luminosity density in the local Universe. By fitting IR SED models, we have re-measured L_TIR of the IRAS Revised Bright Galaxy Sample. We present mid-IR monochromatic luminosity to L_TIR conversions for Spitzer 8,24um, AKARI 9,18um, IRAS 12um, WISE 12,22um, and ISO 15um filters, with scatter ranging 13-44%. The resulting AKARI IR luminosity function (LF) agrees well with that from the IRAS. We integrate the LF weighted by L_TIR to obtain a cosmic IR luminosity density of Omega_TIR= (8.5^{+1.5}_{-2.3})x 10^7 L Mpc^-3, of which 7+-1% is produced by LIRGs, and only 0.4+-0.1% is from ULIRGs in the local Universe. Once IR contributions from AGN and star-forming galaxies (SFG) are separated, SFG IR LF shows a steep decline at the bright-end. Compared with high-redshift results from the AKARI NEP deep survey, these data show a strong evolution of Omega_TIRSF propto (1+z)^4.0+-0.5, and Omega_TIRAGN propto (1+z)^4.4+-0.4. For Omega_TIRAGN, the ULIRG contribution exceeds that from LIRG already by z~1. A rapid evolution in both Omega_TIRAGN and Omega_TIRSFG suggests the correlation between star formation and black hole accretion rate continues up to higher redshifts. We compare the evolution of Omega_TIRAGN to that of X-ray luminosity density. The Omega_TIRAGN/Omega_X-rayAGN ratio shows a possible increase at z>1, suggesting an increase of obscured AGN at z>1.

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Tomotsugu Goto, Stephane Arnouts, Hanae Inami, Hideo Matsuhara, Chris Pearson, Tsutomu T. Takeuchi, Emeric Le Floc'h, Toshinobu Takagi, Takehiko Wada, Takao Nakagawa, Shinki Oyabu, Daisuke Ishihara, Hyung Mok Lee, Woong-Seob Jeong, Chisato Yamauchi, Stephen Serjeant, Chris Sedgwick, Ezequiel Treister. 2010-08-04. Luminosity Functions of Local Infrared Galaxies with AKARI: Implications to the Cosmic Star Formation History and AGN Evolution. https://doi.org/10.1111/j.1365-2966.2010.17466.x

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