J/MNRAS/480/2302 Extended emission-line regions of obscured AGN (Sun+, 2018)
Imaging extended emission-line regions of obscured AGN with the Subaru Hyper
Suprime-Cam Survey.
Sun A.-L., Greene J.E., Zakamska N.L., Goulding A.D., Strauss M.A.,
Huang S., Johnson S.D., Kawaguchi T., Matsuoka Y., Marsteller A.A.,
Nagao T., Toba Y.
<Mon. Not. R. Astron. Soc., 480, 2302-2323 (2018)>
=2018MNRAS.480.2302S 2018MNRAS.480.2302S (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Black holes ; QSOs
Keywords: galaxies: active - (galaxies:) quasars: emission lines -
techniques: image processing
Abstract:
Narrow-line regions excited by active galactic nuclei (AGNs) are
important for studying AGN photoionization and feedback. Their strong
[OIII] lines can be detected with broad-band images, allowing
morphological studies of these systems with large-area imaging
surveys. We develop a new broad-band imaging technique to reconstruct
the images of the [OIII] line, using the Subaru Hyper Suprime-Cam (HSC)
Survey aided with spectra from the Sloan Digital Sky Survey (SDSS).
The technique involves a careful subtraction of the galactic
continuum to isolate emission from the [OIII]λ5007 and
[OIII]λ4959 lines. Compared to traditional targeted
observations, this technique is more efficient at covering larger
samples without dedicated observational resources. We apply this
technique to an SDSS spectroscopically selected sample of 300 obscured
AGN at redshifts 0.1-0.7, uncovering extended emission-line region
candidates with sizes up to tens of kpc. With the largest sample of
uniformly derived narrow-line region sizes, we revisit the narrow-line
region size-luminosity relation. The area and radii of the [OIII]
emission-line regions are strongly correlated with the AGN luminosity
inferred from the mid-infrared (15µm rest frame) with a power-law
slope of 0.62+0.05-0.06±0.10 (statistical and systematic errors),
consistent with previous spectroscopic findings. We discuss
the implications for the physics of AGN emission-line regions and
future applications of this technique, which should be useful for
current and next-generation imaging surveys to study AGN
photoionization and feedback with large statistical samples.
Description:
Our high-quality broad-band images are taken from the HSC survey,
which is part of the Subaru Strategic Program (SSP; Aihara et al.
2018PASJ...70S...4A 2018PASJ...70S...4A). This survey takes advantage of the wide field
capability (1.77deg2 field-of-view) of the Hyper Suprime-Cam
(Miyazaki et al. 2012SPIE.8446E..0ZM, 2018PASJ...70S...1M 2018PASJ...70S...1M; Furusawa et
al. 2018PASJ...70S...3F 2018PASJ...70S...3F; Komiyama et al. 2018PASJ...70S...2K 2018PASJ...70S...2K) on the
Subaru 8.2m telescope to deliver high-quality g, r, i, z, y broad-band
images over a total survey area of ∼1400 deg2. The data used
throughout this paper are based on the S16A internal release taken
between 2014 March and 2016 April. The wide layer, which this paper
focuses on, contains 174deg2 of data with full depth in all five
bands. Some of the data were reprocessed to give a more accurate
estimate of the point spread function (PSF). Our targets are selected
from four SDSS spectroscopically identified obscured type 2 AGN
samples - Zakamska et al. (2003AJ....126.2125Z 2003AJ....126.2125Z, Cat. J/AJ/126/2125);
Reyes et al. (2008AJ....136.2373R 2008AJ....136.2373R, Cat. J/AJ/136/2373); Mullaney et
al. (2013MNRAS.433..622M 2013MNRAS.433..622M); and Yuan, Strauss & Zakamska
(2016MNRAS.462.1603Y 2016MNRAS.462.1603Y).
Type 1 AGNs are excluded in our analysis because their bright nuclei
could cause artefacts that interfere with the imaging of the
emission-line regions. Table C1 presents our primary sample of 300
type 2 AGNs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 82 300 The primary sample
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See also:
J/AJ/126/2125 : SDSS candidate type II quasars (Zakamska+, 2003)
J/AJ/136/2373 : Type 2 quasars from SDSS (Reyes+, 2008)
Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- Name Name of the target (JHHMMSS+DDMMSS)
16- 17 I2 h RAh Right ascension (J2000)
19- 20 I2 min RAm Right ascension (J2000)
22- 25 F4.1 s RAs Right ascension (J2000)
27 A1 --- DE- Declination sign (J2000)
28- 29 I2 deg DEd Declination (J2000)
31- 32 I2 arcmin DEm Declination (J2000)
34- 37 F4.1 arcsec DEs Declination (J2000)
39- 43 F5.3 --- z Redshift
45- 47 A3 --- Bands Line-band and continuum-band used for
constructing the [OIII] map
49 A1 --- Source Source of the object (1)
51- 56 F6.2 mag zMAG ? Absolute HSC z-band Kron AB magnitudes as a
proxy for the stellar mass. K-correction
is not applied
58- 63 F6.2 mag yMAG ? Absolute HSC y-band Kron AB magnitudes as a
proxy for the stellar mass. K-correction
is not applied
65- 69 F5.2 10-7W Lbol ? log AGN bolometric luminosity inferred from
interpolated WISE rest-frame 15µm luminosity
with a bolometric correction factor of 9
71- 75 F5.2 10-7W L[OIII] log [OIII]λ5007 luminosity measured from
the SDSS/BOSS spectrum
77- 79 I3 kpc2 Area Area of the [OIII]λ6007 emission-line
region measured with an isophote level of
rest-frame 3x10-8W/m2/arcsec2 (2)
81- 82 I2 kpc Rad Radius of the [OIII]λ6007 emission-line
region measured with an isophote level of
rest-frame 3x10-8W/m2/arcsec2 (2)
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Note (1): Source of the object as follows:
Z = Zakamska et al. (2003AJ....126.2125Z 2003AJ....126.2125Z, Cat. J/AJ/126/2125)
R = Reyes et al. (2008AJ....136.2373R 2008AJ....136.2373R, Cat. J/AJ/136/2373)
M = Mullaney et al. (2013MNRAS.433..622M 2013MNRAS.433..622M)
Y = Yuan et al. (2016MNRAS.462.1603Y 2016MNRAS.462.1603Y)
Note (2): Zero values in column Area and Rad denote undetected or unresolved
objects
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History:
20-Jun-2022: From electronic version of the journal
15-Jan-2024: sign of declination in the position correted for
J115033-003341, J222112-010506 and J224540-001738
(End) Ana Fiallos [CDS] 19-May-2022