TY - JOUR
T1 - Hyper-luminous dust-obscured galaxies discovered by the Hyper Suprime-Cam on Subaru and WISE
AU - Toba, Yoshiki
AU - Nagao, Tohru
AU - Strauss, Michael A.
AU - Aoki, Kentaro
AU - Goto, Tomotsugu
AU - Imanishi, Masatoshi
AU - Kawaguchi, Toshihiro
AU - Terashima, Yuichi
AU - Ueda, Yoshihiro
AU - Bosch, James
AU - Bundy, Kevin
AU - Doi, Yoshiyuki
AU - Inami, Hanae
AU - Komiyama, Yutaka
AU - Lupton, Robert H.
AU - Matsuhara, Hideo
AU - Matsuoka, Yoshiki
AU - Miyazaki, Satoshi
AU - Morokuma, Tomoki
AU - Nakata, Fumiaki
AU - Oi, Nagisa
AU - Onoue, Masafusa
AU - Oyabu, Shinki
AU - Price, Paul
AU - Tait, Philip J.
AU - Takata, Tadafumi
AU - Tanaka, Manobu M.
AU - Terai, Tsuyoshi
AU - Turner, Edwin L.
AU - Uchida, Tomohisa
AU - Usuda, Tomonori
AU - Utsumi, Yousuke
AU - Yamada, Yoshihiko
AU - Wang, Shiang Yu
N1 - Publisher Copyright:
© The Author 2015. Published by Oxford University Press on behalf of the Astronomical Society of Japan.
PY - 2015/6/30
Y1 - 2015/6/30
N2 - We present the photometric properties of a sample of infrared (IR) bright dust-obscured galaxies (DOGs). Combining wide and deep optical images obtained with the Hyper Suprime-Cam on the Subaru Telescope and all-sky mid-IR (MIR) images taken with Wide-Field Infrared Survey Explorer, we discovered 48 DOGs with i - Ks > 1.2 and i - [22] > 7.0, where i, Ks, and [22] represent AB magnitude in the i-band, Ks-band, and 22 μm, respectively, in the GAMA 14 hr field (∼ 9 deg2). Among these objects, 31 (∼ 65%) show power-law spectral energy distributions (SEDs) in the near-IR (NIR) and MIR regime, while the remainder show an NIR bump in their SEDs. Assuming that the redshift distribution for our DOGs sample is Gaussian, with mean and sigma z = 1.99 ± 0.45, we calculated their total IR luminosity using an empirical relation between 22 μm luminosity and total IR luminosity. The average value of the total IR luminosity is (3.5 ± 1.1) × 1013 L⊙, which classifies them as hyper-luminous infrared galaxies. We also derived the total IR luminosity function (LF) and IR luminosity density (LD) for a flux-limited subsample of 18 DOGs with 22 μm flux greater than 3.0 mJy and with i-band magnitude brighter than 24 AB magnitude. The derived space density for this subsample is log Φ = -6.59 ± 0.11 [Mpc-3]. The IR LF for DOGs including data obtained from the literature is fitted well by a double-power law. The derived lower limit for the IR LD for our sample is ρIR∼3.8 × 107 [L⊙ Mpc-3] and its contributions to the total IR LD, IR LD of all ultra-luminous infrared galaxies, and that of all DOGs are > 3%, > 9%, and > 15%, respectively.
AB - We present the photometric properties of a sample of infrared (IR) bright dust-obscured galaxies (DOGs). Combining wide and deep optical images obtained with the Hyper Suprime-Cam on the Subaru Telescope and all-sky mid-IR (MIR) images taken with Wide-Field Infrared Survey Explorer, we discovered 48 DOGs with i - Ks > 1.2 and i - [22] > 7.0, where i, Ks, and [22] represent AB magnitude in the i-band, Ks-band, and 22 μm, respectively, in the GAMA 14 hr field (∼ 9 deg2). Among these objects, 31 (∼ 65%) show power-law spectral energy distributions (SEDs) in the near-IR (NIR) and MIR regime, while the remainder show an NIR bump in their SEDs. Assuming that the redshift distribution for our DOGs sample is Gaussian, with mean and sigma z = 1.99 ± 0.45, we calculated their total IR luminosity using an empirical relation between 22 μm luminosity and total IR luminosity. The average value of the total IR luminosity is (3.5 ± 1.1) × 1013 L⊙, which classifies them as hyper-luminous infrared galaxies. We also derived the total IR luminosity function (LF) and IR luminosity density (LD) for a flux-limited subsample of 18 DOGs with 22 μm flux greater than 3.0 mJy and with i-band magnitude brighter than 24 AB magnitude. The derived space density for this subsample is log Φ = -6.59 ± 0.11 [Mpc-3]. The IR LF for DOGs including data obtained from the literature is fitted well by a double-power law. The derived lower limit for the IR LD for our sample is ρIR∼3.8 × 107 [L⊙ Mpc-3] and its contributions to the total IR LD, IR LD of all ultra-luminous infrared galaxies, and that of all DOGs are > 3%, > 9%, and > 15%, respectively.
KW - catalogs
KW - galaxies: active
KW - galaxies: luminosity function mass function
KW - infrared: galaxies
KW - methods: statistical
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U2 - 10.1093/pasj/psv057
DO - 10.1093/pasj/psv057
M3 - Article
AN - SCOPUS:84943383113
SN - 0004-6264
VL - 67
JO - Publications of the Astronomical Society of Japan
JF - Publications of the Astronomical Society of Japan
IS - 5
M1 - 86
ER -