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Hyung Mok Lee, Myungshin Im, Takehiko Wada, Hyunjin Shim, Seong Jin Kim, Myung Gyoon Lee, Narae Hwang, Hideo Matsuhara, Takao Nakagawa, Shinki Oyabu, Chris P. Pearson, Toshinobu Takagi, Takashi Onaka, Naofumi Fujishiro, Hitoshi Hanami, Daisuke Ishihara, Yoshifusa Ita, Hirokazu Kataza, Woojung Kim, Toshio Matusmoto, Hiroshi Murakami, Youichi Ohyama, Itsuki Sakon, Toshihiko Tanabé, Kazunori Uemizu, Munetaka Ueno, Fumihiko Usui, Hidenori Watarai, Nature of Infrared Sources in 11 |$\mu $|m Selected Sample from Early Data of the AKARI North Ecliptic Pole Deep Survey, Publications of the Astronomical Society of Japan, Volume 59, Issue sp2, 10 October 2007, Pages S529–S542, https://doi.org/10.1093/pasj/59.sp2.S529
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Abstract
We present the properties of 11 |$\mu $|m selected sources detected in the early data of the North Ecliptic Pole Deep (NEP-Deep) Survey of AKARI. The data set covers 6 wavelength bands from 2.5 to 11 |$\mu $|m, with exposure times of 10–20 minutes. This field lies within the CFHT survey with four filter bands (|$g^\prime, r^\prime, i^\prime, z^\prime$|), enabling us to establish nearly continuous spectral energy distributions (SEDs) for wavelengths ranging from 0.4 to 11 |$\mu $|m. The main sample studied here consists of 72 sources whose 11 |$\mu $|m AB magnitudes are equal to or brighter than 18.5 (144 |$\mu $|Jy), which is complete to more than 90%. The 11 |$\mu $|m band has an advantage of sampling star-forming galaxies with low-to-medium redshifts, since the prominent PAH feature shifts into this band. As expected, we find that the majority (71%) of 11 |$\mu $|m bright sources are star-forming galaxies at |$0.2 \lesssim z \lesssim 0.7$| with |$L_{\rm IR} \sim 10^{10}-10^{12}~L_{\odot}$| based on detailed modelling of the SEDs. We also find four AGNs lying at various redshifts in the main sample. In addition, we discuss a few sources that have non-typical SEDs of the main sample, including a brown-dwarf candidate, a steep power-law source, a flat-spectrum object, and an early-type galaxy at moderate redshift.
