J/ApJ/850/140 SDSS spectral analysis of IR-bright DOGs (Toba+, 2017)
Ionized gas outflows in infrared-bright dust-obscured galaxies selected with
WISE and SDSS.
Toba Y., Bae H.-J., Nagao T., Woo J.-H., Wang W.-H., Wagner A.Y., Sun A.-L.,
Chang Y.-Y.
<Astrophys. J., 850, 140 (2017)>
=2017ApJ...850..140T 2017ApJ...850..140T
ADC_Keywords: Galaxies, IR; Spectra, optical; Redshifts; Active gal. nuclei;
Velocity dispersion
Keywords: catalogs ; galaxies: active ; galaxies: kinematics and dynamics ;
infrared: galaxies
Abstract:
We present the ionized gas properties of infrared (IR)-bright
dust-obscured galaxies (DOGs) that show an extreme optical/IR color,
(i-[22])AB>7.0, selected with the Sloan Digital Sky Survey (SDSS)
and Wide-field Infrared Survey Explorer (WISE). For 36 IR-bright DOGs
that show [OIII]λ5007 emission in the SDSS spectra, we
performed a detailed spectral analysis to investigate their ionized
gas properties. In particular, we measured the velocity offset (the
velocity with respect to the systemic velocity measured from the
stellar absorption lines) and the velocity dispersion of the [OIII]
line. We found that the derived velocity offset and dispersion of most
IR-bright DOGs are larger than those of Seyfert 2 galaxies (Sy2s) at
z<0.3, meaning that the IR-bright DOGs show relatively strong outflows
compared to Sy2s. This can be explained by the difference in IR
luminosity contributed from active galactic nuclei, LIR (AGN),
because we found that (i) LIR (AGN) correlates with the velocity
offset and dispersion of [OIII] and (ii) our IR-bright DOG sample has
larger LIR (AGN) than Sy2s. Nevertheless, the fact that about 75%
IR- bright DOGs have a large (>300km/s) velocity dispersion, which is
a larger fraction compared to other AGN populations, suggests that
IR-bright DOGs are good laboratories to investigate AGN feedback. The
velocity offset and dispersion of [OIII] and [NeIII]λ3869 are
larger than those of [OII]λ3727, which indicates that the
highly ionized gas tends to show stronger outflows.
Description:
The IR-bright dust-obscured galaxies (DOG) sample for the spectral
analysis was selected from an IR-bright DOG sample in Toba & Nagao
(2016ApJ...820...46T 2016ApJ...820...46T). They selected 67 IR-bright DOGs with
(i-[22])AB>7.0 and flux density at 22um>3.8mJy from the Sloan
Digital Sky Survey (SDSS) spectroscopic catalog (see V/147) and
Wide-field Infrared Survey Explorer (WISE) ALLWISE catalog
(see II/328)). Among them, we narrowed down to 36 objects with
0.05<z<1.02 that clearly have [OIII] in their SDSS spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table12.dat 290 36 [OIII] properties and energetics of WISE-SDSS
spec DOGs (tables 1 and 2)
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See also:
II/328 : AllWISE Data Release (Cutri+ 2013)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
J/AJ/130/381 : Blueshifted [O III] emission (Boroson+, 2005)
J/MNRAS/371/703 : MILES library of empirical spectra (Sanchez-Blazquez+, 2006)
J/ApJ/663/81 : SED of hard X-ray selected AGN in XMDS (Polletta+, 2007)
J/ApJ/713/970 : Low-resolution SED templates for AGNs & gal. (Assef+, 2010)
J/ApJ/737/71 : The [OIII] emission line in SDSS AGNs (Zhang+, 2011)
J/ApJ/769/95 : [NeV] or [NeIII] double peaked SDSS quasars (Barrows+, 2013)
J/MNRAS/430/60 : Suzaku view of ionized outflows in AGN (Gofford+, 2013)
J/A+A/562/A21 : AGN feedback from CO observations (Cicone+, 2014)
J/ApJ/788/45 : Luminosity & redshift of gal. from WISE/SDSS (Toba+, 2014)
J/ApJ/813/82 : z<0.06 broad-line AGN emission-line measures (Reines+, 2015)
J/A+A/591/A28 : 2 QSOs SINFONI K-band datacubes (Carniani+, 2016)
J/ApJ/840/21 : FIR data of IR-bright dust-obscured gal. (DOGs) (Toba+, 2017)
http://www.sdss3.org/ : SDSS-III home page
Byte-by-byte Description of file: table12.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/36] Sequential identifier used
in this paper
4- 17 A14 --- ObjID Truncated SDSS DR12 Object ID as used
in the text
19- 20 I2 h RAh SDSS-DR12 Hour of Right Ascension (J2000)
22- 23 I2 min RAm Minute of Right Ascension (J2000)
25- 29 F5.2 s RAs Second of Right Ascension (J2000)
31- 31 A1 --- DE- SDSS-DR12 Sign of Declination (J2000)
32- 33 I2 deg DEd SDSS-DR12 Degree of Declination (J2000)
35- 36 I2 arcmin DEm Arcminute of Declination (J2000)
38- 42 F5.2 arcsec DEs Arcsecond of Declination (J2000)
44- 47 I4 --- Plate SDSS plate number
49- 51 I3 --- Fiber SDSS fiberID
53- 57 I5 d MJD Modified Julian Date of last SDSS spectrum
59- 77 F19.17 --- zspec [0.05/1.1] Spectroscopic Redshift
79- 84 A6 --- Type AGN type ("type 2": 32 occurrences or
"type 1")
86-102 F17.15 mag i-22 [7/8.1] SDSS i - WISE [22] color index,
AB magnitude system
104-120 F17.14 [Lsun] logLIR [10.5/13.1] Log of IR luminosity (1)
122-138 F17.14 [10-7W] LogLbol [44.2/46.7] Bolometric luminosity;
in erg/s units (2)
140-140 I1 --- w[OIII] [0/1]? Flag for [OIII] broad wing (3)
142-163 F22.16 km/s v[OIII] [-1485/891] Velocity offset, [OIII]
165-182 F18.14 km/s e_v[OIII] [20.5/570.2] Uncertainty in v[OIII]
184-202 F19.14 km/s sigmaO3 [76.7/1125.5] Dispersion, [OIII]
204-223 F20.16 km/s e_sigmaO3 [0.5/271.4] Uncertainty in sigmaO3
225-231 F7.4 [10-7W] logLHb [40.4/43]? Log of Hβ luminosity;
in erg/s units
233-239 F7.5 [Msun] logMgas [6.9/9.4]? Log of ionized gas mass
241-247 F7.5 [km/s] logvout [2.1/3.6]? Log of flux-weighted intrinsic
outflow velocity
249-255 F7.5 [pc] logRout [3.2/4.3]? Log of outflow radius
257-264 F8.6 [Msun/yr] logMout [0.7/2.7]? Log of mass outflow rate (dM/dt)
266-272 F7.4 [10-7W] logEout [40.8/44.7]? Log of energy injection rate;
in erg/s units (dE/dt)
274-280 F7.4 [10-5N] logPout [33.9/36.7]? Log of momentum flux,
in dyne units (dP/dt)
282-290 F9.6 --- Pout-b [0.2/16.2]? Momentum boost (4)
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Note (1): The infrared luminosity at 8-1000um derived in
Toba & Nagao (2016ApJ...820...46T 2016ApJ...820...46T).
Note (2): The bolometric luminosity calculated by integrating the best-fit SED
template at wavelengths longward of Lyα (see Section 4.1).
Note (3): Flag for [OIII] broad wing as follows:
0 = there is no broad wing of [OIII] line;
1 = there is broad wing of [OIII] line (see Section 3.1).
Note (4): The momentum boost is the ratio of the momentum flux (Pout) and the
AGN radiative momentum output (LIR(AGN)/c).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 29-Jun-2018