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arXiv · 1001.0013

Evolution of Infrared Luminosity functions of Galaxies in the AKARI NEP-Deep field: Revealing the cosmic star formation history hidden by dust

Tomotsugu Goto·T. Takagi·H. Matsuhara·T. T. Takeuchi·C. Pearson·T. Wada·T. Nakagawa·O. Ilbert·E. Le Floc'h·S. Oyabu·Y. Ohyama·M. Malkan·H. M. Lee·M. G. Lee·H. Inami·N. Hwang·H. Hanami·M. Im·K. Imai·T. Ishigaki·S. Serjeant·H. Shim
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Abstract

Dust-obscured star-formation becomes much more important with increasing intensity, and increasing redshift. We aim to reveal cosmic star-formation history obscured by dust using deep infrared observation with the AKARI. We construct restframe 8um, 12um, 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 24um) by the AKARI satellite allows us to estimate restframe 8um and 12um luminosities without using a large extrapolation based on a SED fit, which was the largest uncertainty in previous work. We have found that all 8um (0.38<z<2.2), 12um (0.15<z<1.16), and TIR LFs (0.2<z<1.6), show a continuous and strong evolution toward higher redshift. In terms of cosmic infrared luminosity density (Omega_IR), which was obtained by integrating analytic fits to the LFs, we found a good agreement with previous work at z<1.2, and that the Omega_IR evolves as propto (1+z)^4.4+-1.0. When we separate contributions to Omega_IR by LIRGs and ULIRGs, we found more IR luminous sources are increasingly more important at higher redshift. We found that the ULIRG (LIRG) contribution increases by a factor of 10 (1.8) from z=0.35 to z=1.4.

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Tomotsugu Goto, T. Takagi, H. Matsuhara, T. T. Takeuchi, C. Pearson, T. Wada, T. Nakagawa, O. Ilbert, E. Le Floc'h, S. Oyabu, Y. Ohyama, M. Malkan, H. M. Lee, M. G. Lee, H. Inami, N. Hwang, H. Hanami, M. Im, K. Imai, T. Ishigaki, S. Serjeant, H. Shim. 2009-12-30. Evolution of Infrared Luminosity functions of Galaxies in the AKARI NEP-Deep field: Revealing the cosmic star formation history hidden by dust. https://doi.org/10.1051/0004-6361/200913182

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