J/ApJ/876/132 IR-bright DOGs viewed with Subaru HSC (Noboriguchi+, 2019)
Optical properties of infrared-bright dust-obscured galaxies viewed with Subaru
Hyper Suprime-Cam.
Noboriguchi A., Nagao T., Toba Y., Niida M., Kajisawa M., Onoue M.,
Matsuoka Y., Yamashita T., Chang Y.-Y., Kawaguchi T., Komiyama Y.,
Nobuhara K., Terashima Y., Ueda Y.
<Astrophys. J., 876, 132 (2019)>
=2019ApJ...876..132N 2019ApJ...876..132N
ADC_Keywords: Galaxies, IR; Photometry, ugriz; Redshifts
Keywords: galaxies: active ; galaxies: starburst ; infrared: galaxies ;
methods: statistical
Abstract:
We report on the optical properties of infrared (IR)-bright
dust-obscured galaxies (DOGs) that are defined as (i-[22])AB≥7.0.
Because supermassive black holes (SMBHs) in IR-bright DOGs are
expected to be rapidly growing in the major-merger scenario, they
provide useful clues for understanding the coevolution of SMBHs and
their host galaxies. However, the optical properties of IR-bright DOGs
remain unclear because the optical emission of a DOG is very faint. By
combining ∼105deg2 images of the optical, near-IR, and mid-IR data
obtained from the Subaru Hyper Suprime-Cam (HSC) survey, the VISTA
VIKING survey, and the Wide-field Infrared Survey Explorer all-sky
survey, respectively, 571 IR-bright DOGs were selected. We found that
IR-bright DOGs show a redder (g-z)AB color than do other populations
of dusty galaxies, such as ultraluminous IR galaxies (ULIRGs) at a
similar redshift, with a significantly large dispersion. Among the
selected DOGs, star formation (SF)-dominated DOGs show a relatively
red color, while active galactic nucleus (AGN)-dominated DOGs show a
rather blue color in optical. This result is consistent with the idea
that the relative AGN contribution in the optical emission becomes
more significant at a later stage in the major-merger scenario. We
discovered eight IR-bright DOGs showing a significant blue excess in
blue HSC bands. This blue excess can be interpreted as a leaked AGN
emission that is either a directly leaking or a scattered AGN
emission, as proposed for some blue-excess Hot DOGs in earlier studies.
Description:
We selected IR-bright dust-obscured galaxies (DOGs) by combining the
WISE all-sky data (II/328) and the deep optical imaging data obtained
with the Subaru Hyper Suprime-Cam (HSC) (S16A: 2014 March to 2016 April)
and VIKING DR2 (II/343) data using a procedure similar to that of
Toba+ (2015PASJ...67...86T 2015PASJ...67...86T).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table11.dat 222 571 Catalog of dust-obscured galaxies (DOGs)
in this study
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See also:
B/subaru : Log of Subaru Prime Focus Camera Exposures (ADAC NAOJ, 2007)
III/88 : Stellar Spectrophotometric Atlas (Gunn+ 1983)
II/328 : AllWISE Data Release (Cutri+ 2013)
II/326 : Revised SWIRE photometric redshifts (Rowan-Robinson+, 2013)
II/343 : VIKING catalogue data release 2 (Edge+, 2016)
VII/279 : SDSS quasar catalog: twelfth data release (Paris+, 2017)
J/PASP/110/863 : Stellar Spectral Flux Library: 1150-25000Å (Pickles 1998)
J/AJ/131/2766 : Quasar luminosity function from SDSS-DR3 (Richards+, 2006)
J/ApJ/663/81 : SED of hard X-ray selected AGN in XMDS (Polletta+, 2007)
J/MNRAS/413/971 : Galaxy And Mass Assembly (GAMA) DR1 (Driver+, 2011)
J/ApJ/744/150 : Dust-obscured galaxies (DOGs) at z≃2 (Bussmann+, 2012)
J/AJ/143/125 : SED of 113 dust-obscured galaxies at z∼2 (Melbourne+, 2012)
J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)
J/ApJ/797/54 : ULIRGs in the AKARI all-sky survey (Kilerci Eser+, 2014)
J/ApJ/840/21 : IR-bright dust-obscured galaxies (DOGs) (Toba+, 2017)
J/ApJ/850/140 : SDSS spectral analysis of IR-bright DOGs (Toba+, 2017)
Byte-by-byte Description of file: table11.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [HSC]
5- 23 A19 --- HSC Object ID based on HSC-SSP coordinates
(JHHMMSS.ss+DDMMSS.s)
25- 33 F9.5 deg RAdeg [34.19/225.2] Right Ascension (J2000)
35- 42 F8.5 deg DEdeg [-6.3/2.5] Declination (J2000)
44- 48 F5.2 mag gmag [19.46/26.58] Subaru/HSC g-band AB magnitude (1)
50- 53 F4.2 mag e_gmag [0/0.3] Uncertainty in gmag (1)
55- 59 F5.2 mag rmag [19.08/25.84] Subaru/HSC r-band AB magnitude (1)
61- 64 F4.2 mag e_rmag [0/0.3] Uncertainty in rmag (1)
66- 70 F5.2 mag imag [18.51/25.55] Subaru/HSC i-band AB magnitude (1)
72- 75 F4.2 mag e_imag [0/0.2] Uncertainty in imag (1)
77- 81 F5.2 mag zmag [18.53/25.25] Subaru/HSC z-band AB magnitude (1)
83- 86 F4.2 mag e_zmag [0/0.2] Uncertainty in zmag (1)
88- 92 F5.2 mag ymag [18.46/24.57] Subaru/HSC y-band AB magnitude (1)
94- 97 F4.2 mag e_ymag [0/0.2] Uncertainty in ymag (1)
99-103 F5.2 mag Zmag [18.47/23.29]? VIKING Z-band AB magnitude (1)
105-108 F4.2 mag e_Zmag [0.01/0.4]? Uncertainty in Zmag (1)
110-114 F5.2 mag Ymag [18.42/22.68]? VIKING Y-band AB magnitude (1)
116-119 F4.2 mag e_Ymag [0.01/0.5]? Uncertainty in Ymag (1)
121-125 F5.2 mag Jmag [18.02/22.23]? VIKING J-band AB magnitude (1)
127-130 F4.2 mag e_Jmag [0.01/0.4]? Uncertainty in Jmag (1)
132-136 F5.2 mag Hmag [17.63/21.78]? VIKING H-band AB magnitude (1)
138-141 F4.2 mag e_Hmag [0.01/0.4]? Uncertainty in Hmag (1)
143-147 F5.2 mag Ksmag [16.72/21.19] VIKING Ks-band AB magnitude (1)
149-152 F4.2 mag e_Ksmag [0.01/0.3] Uncertainty in Ksmag (1)
154-158 F5.2 mag W1mag [15.18/21.03] WISE 3.4um band AB magnitude (1)
160-163 F4.2 mag e_W1mag [0.02/0.4] Uncertainty in W1mag (1)
165-169 F5.2 mag W2mag [14.03/20.74]? WISE 4.6um band AB magnitude (1)
171-174 F4.2 mag e_W2mag [0.02/0.6]? Uncertainty in W2mag (1)
176-180 F5.2 mag W3mag [11.7/18.05]? WISE 12um band AB magnitude (1)
182-185 F4.2 mag e_W3mag [0.01/0.6]? Uncertainty in W3mag (1)
187-191 F5.2 mag W4mag [10.47/15.68] WISE 22um band AB magnitude (1)
193-196 F4.2 mag e_W4mag [0.02/0.4] Uncertainty in W4mag (1)
198-201 F4.2 --- zphot [0/3.6]? Photometric Redshift (2)
203-206 F4.2 --- e_zphot [0/1.6]? Uncertainty in zphot
208-222 A15 --- Class DOG types (3)
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Note (1): The VIKING and WISE magnitudes were converted from Vega
magnitude using the conversion factors from
Gonzalez-Fernandez+ (2018MNRAS.474.5459G 2018MNRAS.474.5459G); Jarrett+ (2011ApJ...735..112J 2011ApJ...735..112J).
The HSC and VIKING data were corrected for Galactic extinction,
Schlegel+ (1998ApJ...500..525S 1998ApJ...500..525S).
Non-detection and non-observation are represented as blanks (nulls).
Note (2): Photometric redshift estimated with the HSC MIZUKI code,
Tanaka (2015ApJ...801...20T 2015ApJ...801...20T); Tanaka et al. (2018PASJ...70S...9T 2018PASJ...70S...9T).
Note (3): Classification of dust-obscured galaxies (DOGs) as follows:
p = PL DOGs (AGN-dominated phase )
b = Bump DOGs (SF-dominated phase)
u = unclassified DOGs
BluDOG = blue-excess DOGs (BluDOG ID in Figure22 is provided in parenthesis)
See Section 2.2 and 4.4.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 19-Nov-2020