TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 65 (No. 10), pp. 1101-1108, 2013

Dusty Universe viewed by AKARI far infrared detector

K. Małek1, A. Pollo2,3, T. T. Takeuchi1, E. Giovannoli4,5, V. Buat4, D. Burgarella4, M. Malkan6, and A. Kurek3

1Department of Particle and Astrophysical Science, Nagoya University, Furo-cho, Chikusa-ku, 464-8602 Nagoya, Japan
2National Centre for Nuclear Research, ul. Hoża 69, 00-681 Warszawa, Poland
3The Astronomical Observatory of the Jagiellonian University, ul. Orla 171, 30-244 Kraków, Poland
4Laboratoire d'Astrophysique de Marseille, OAMP, Université Aix-Marseille, CNRS, 38 rue Frédéric Joliot-Curie, 13388 Marseille, cedex 13, France
5University of the Western Cape, Private Bag X17, 7535, Bellville, Cape Town, South Africa
6Department of Physics and Astronomy, University of California, Los Angeles, CA 90024

(Received November 8, 2012; Revised June 11, 2013; Accepted June 18, 2013; Online published October 24, 2013)

Abstract: We present the results of the analysis of multiwavelength Spectral Energy Distributions (SEDs) of far-infrared galaxies detected in the AKARI Deep Field-South (ADF-S) Survey. The analysis uses a carefully selected sample of 186 sources detected at the 90 μm AKARI band, identified as galaxies with cross-identification in public catalogues. For sources without known spectroscopic redshifts, we estimate photometric redshifts after a test of two independent methods: one based on using mainly the optical - mid infrared range, and one based on the whole range of ultraviolet - far infrared data. We observe a vast improvement in the estimation of photometric redshifts when far infrared data are included, compared with an approach based mainly on the optical - mid infrared range. We discuss the physical properties of our far-infrared-selected sample. We conclude that this sample consists mostly of rich in dust and young stars nearby galaxies, and, furthermore, that almost 25% of these sources are (Ultra)Luminous Infrared Galaxies. Average SEDs normalized at 90 μm for normal galaxies (138 sources), LIRGs (30 sources), and ULIRGs (18 galaxies) show a significant shift in the peak wavelength of the dust emission, and an increasing ratio between their bolometric and dust luminosities which varies from 0.39 to 0.73.
Key words: Galaxies, starburst galaxies, SED, spectral energy distribution, LIRGs, ULIRGs.

Corresponding author E-mail: malek.kasia@nagoya-u.jp

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