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Infrared luminosity functions of AKARI Sloan Digital Sky Survey galaxies

Goto, Tomotsugu and Arnouts, Stephane and Malkan, Matthew A. and Takagi, Toshinobu and Inami, Hanae and Pearson, Chris and Wada, Takehiko and Matsuhara, Hideo and Yamauchi, Chisato and Takeuchi, Tsutomu T. and Nakagawa, Takao and Oyabu, Shinki and Ishihara, Daisuke and Sanders, David B. and Le Floc'h, Emeric and Lee, Hyung Mok and Jeong, Woong-Seob and Serjeant, Stephen and Sedgwick, Chris (2011) Infrared luminosity functions of AKARI Sloan Digital Sky Survey galaxies. Monthly Notices of the Royal Astronomical Society, 414 (3). pp. 1903-1913. ISSN 0035-8711.

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By cross-correlating the AKARI all-sky survey in six infrared (IR) bands (9, 18, 65, 90, 140 and 160 μm) with the Sloan Digital Sky Survey (SDSS) galaxies, we identified 2357 IR galaxies with a spectroscopic redshift. This is not just one of the largest samples of local IR galaxies, but AKARI provides crucial far-IR (FIR) bands for accurately measuring the galaxy spectral energy distribution (SED) across the peak of the dust emission at > 100 μ m. By fitting modern IR SED models to the AKARI photometry, we measured the total infrared luminosity (L_(IR)) of individual galaxies. Using this L_(IR), 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 L_(IR), we measured the local cosmic IR luminosity density of Ω_(IR_= (3.8^(+5.8)_(−1.2)) × 10^8 L_⊙ Mpc^(−3). 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 L_(IR) from 25 to 90 per cent at 9 < log L_(IR) < 12.5. The SFR_(Hα) and L_([OΙΙΙ]) show good correlations with L_(IR) 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 L_(IR) > 10^(11) L_⊙, coinciding with the break of both the SFG and AGN IR LFs. At L_(IR)≤ 10^(11) L_⊙, SFG dominates IR LFs. Only 1.1 ± 0.1 per cent of Ω_(IR) is produced by luminous infrared galaxies (L_(IR) > 10^(11) L_⊙), and only 0.03 ± 0.01 per cent by ultraluminous infrared galaxies (L_(IR) > 10^(12) L_⊙) in the local Universe. Compared with high-redshift results from the AKARI NEP deep survey, we observed a strong evolution of Ω^(SFG)IR^∝ (1 +z)^(4.1±0.4) and Ω^(AGN)IR^∝ (1+z)^(4.1±0.5). Our results show that all of our measured quantities (IR LFs, L^*, Ω^(AGN)IR, Ω^(SFG)IR) show smooth and steady increase from lower redshift (the Revised Bright Galaxy Sample) to higher redshift (the AKARI NEP deep survey).

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Pearson, Chris0000-0001-6139-649X
Additional Information:© 2011 The Authors. Monthly Notices of the Royal Astronomical Society © 2011 RAS. Accepted 2011 February 8. Received 2011 January 19; in original form 2010 September 23. Article first published online: 1 JUN 2011. We thank the anonymous referee for many insightful comments, which significantly improved the paper. TG acknowledges financial support from the Japan Society for the Promotion of Science (JSPS) through JSPS Research Fellowships for Young Scientists. This research is based on observations with AKARI, a JAXA project with the participation of ESA. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this sacred mountain. TTT has been supported by the Program for Improvement of Research Environment for Young Researchers from Special Coordination Funds for Promoting Science and Technology, and the Grant-in-Aid for the Scientific Research Fund (20740105) commissioned by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan. TTT has been also partially supported from the Grand-in-Aid for the Global COE Program ‘Quest for Fundamental Principles in the Universe: from Particles to the Solar System and the Cosmos’ from the MEXT.
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Japan Society for the Promotion of Science (JSPS)UNSPECIFIED
Special Coordination Funds for Promoting Science and TechnologyUNSPECIFIED
Ministry of Education, Culture, Sports, Science and Technology (MEXT)20740105
Subject Keywords:galaxies: evolution; galaxies: formation; galaxies: interactions; galaxies: peculiar; galaxies: starburst; infrared: galaxies
Issue or Number:3
Record Number:CaltechAUTHORS:20110816-111539061
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Official Citation:Infrared luminosity functions of AKARI Sloan Digital Sky Survey galaxies (pages 1903–1913) Tomotsugu Goto, Stephane Arnouts, Matthew Malkan, Toshinobu Takagi, Hanae Inami, Chris Pearson, Takehiko Wada, Hideo Matsuhara, Chisato Yamauchi, Tsutomu T. Takeuchi, Takao Nakagawa, Shinki Oyabu, Daisuke Ishihara, David B. Sanders, Emeric Le Floc’h, Hyung Mok Lee, Woong-Seob Jeong, Stephen Serjeant and Chris Sedgwick Article first published online: 1 JUN 2011 | DOI: 10.1111/j.1365-2966.2011.18499.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24887
Deposited By: Ruth Sustaita
Deposited On:16 Aug 2011 20:24
Last Modified:03 Oct 2019 03:00

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