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Evolution of infrared luminosity functions of galaxies in the AKARI NEP-deep field: revealing the cosmic star formation history hidden by dust

Goto, T.; Takagi, T.; Matsuhara, H.; Takeuchi, T. T.; Pearson, C.; Wada, T.; Nakagawa, T.; Ilbert, O.; Le Floc'h, E.; Oyabu, S.; Ohyama, Y.; Malkan, M.; Lee, H. M.; Lee, M. G.; Inami, H.; Hwang, N.; Hanami, H.; Im, M.; Imai, K.; Ishigaki, T.; Serjeant, S. and Shim, H. (2010). Evolution of infrared luminosity functions of galaxies in the AKARI NEP-deep field: revealing the cosmic star formation history hidden by dust. Astronomy & Astrophysics, 514, article no. A6.

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Aims. Dust-obscured star-formation increases with increasing intensity and increasing redshift. We aim to reveal the cosmic starformation history obscured by dust using deep infrared observation with AKARI.

Methods. We constructed restframe 8 μm, 12 μm, and total infrared (TIR) luminosity functions (LFs) at 0.15 < z < 2.2 using 4128 infrared sources in the AKARI NEP-deep field. A continuous filter coverage in the mid-IR wavelength (2.4, 3.2, 4.1, 7, 9, 11, 15, 18, and 24 μm) by the AKARI satellite allowed us to estimate restframe 8 μm and 12 μm luminosities without using a large extrapolation based on an SED fit, which was the largest uncertainty in previous work.

Results. We find that all 8 μm (0.38 < z < 2.2), 12 μm (0.15 < z < 1.16), and TIR LFs (0.2 < z < 1.6) show continuous and strong evolution toward higher redshift. Our direct estimate of 8 μm LFs is useful since previous work often had to use a large extrapolation from the Spitzer 24 μm to 8 μm, where SED modeling is more difficult because of the PAH emissions. In terms of cosmic infrared luminosity density (ΏIR), which was obtained by integrating analytic fits to the LFs, we find good agreement with previous work at z < 1.2. We find the ΏIR evolves as ∝(1 + z)4.4±1.0. When we separate contributions to ΏIR by LIRGs and ULIRGs, we found moreIR luminous sources are increasingly more important at higher redshift. We find that the ULIRG (LIRG) contribution increases by a factor of 10 (1.8) from z = 0.35 to z = 1.4.

Item Type: Journal Item
Copyright Holders: 2010 ESO
ISSN: 1432-0746
Extra Information: 12 pp.
Keywords: infrared galaxies; luminosity function; mass function; galactic evolution; high-redshift galaxies; galactic formation; starburst galaxies
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 25312
Depositing User: Astrid Peterkin
Date Deposited: 10 Dec 2010 13:43
Last Modified: 08 Dec 2018 05:41
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