J/ApJS/258/29 Southern-sky optical AGN catalog from 6dFGS sp. (Chen+, 2022)
A uniformly selected, southern-sky 6dF, optical AGN catalog.
Chen Y.-P., Zaw I., Farrar G.R., Elgamal S.
<Astrophys. J. Suppl. Ser., 258, 29 (2022)>
=2022ApJS..258...29C 2022ApJS..258...29C
ADC_Keywords: Active gal. nuclei; Spectra, optical; Redshifts; Infrared sources;
Surveys; Galaxies, spectra
Keywords: Active galactic nuclei ; Galaxies ; Catalogs ;
Emission line galaxies ; AGN host galaxies
Abstract:
We have constructed a catalog of active galactic nuclei (AGNs) with
z<0.13, based on optical spectroscopy, from the parent sample of
galaxies in the Six-Degree Field (6dF) galaxy survey (Final Release of
6dFGS), a census of the Southern Hemisphere. This work is an extension
of our all-sky AGN catalog in Zaw+ (ZCF; 2019, J/ApJ/872/134). The ZCF
is based on 43533 galaxies with Ks≤11.75 (z≤0.09) in the Two Micron
All-Sky Survey (2MASS) Redshift Survey (2MRS). The parent catalog of
this work, the 6dF catalog, consists of 136304 publicly available
digital spectra for 125071 galaxies with decl. ≤0° and Ks≤12.65
(median z=0.053). Our AGN catalog consists of 3109 broadline AGNs and
12156 narrowline AGNs which satisfy the 2003 criteria, of which 3865
also satisfy the 2001 criteria. We also provide emission-line widths,
fluxes, flux errors, and signal-to-noise ratios of all the galaxies in
our spectroscopic sample, allowing users to customize the selection
criteria. In addition, we provide the AGN likelihood for the rest of
galaxies based on the availability and quality of their spectra. These
likelihood values can be used for rigorous statistical analyses.
Description:
We take the Six-Degree Field galaxy survey (6dFGS;
Jones+ 2004MNRAS.355..747J 2004MNRAS.355..747J and 2009, VII/259) as the parent sample for
constructing our southern sky optical AGN catalog. The 6dFGS catalog
consists of 136304 publicly available digital spectra of 125071
galaxies taken with the 6dF multifiber spectrograph, operated on the
United Kingdom Schmidt Telescope (UKST). The observations of 6dFGS
were carried out at the UKST from 2001 to 2006. The majority of the
observations of the 6dFGS galaxies consist of two spectra, in the
V-band and the R-band (resolution of 5-6Å in FWHM and 9-12Å
FWHM, respectively).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 355 15265 The AGN catalog
table3.dat 320 72058 Non-AGN galaxies
table4.dat 83 13940 The 6dF galaxies affected by the telluric
contamination
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See also:
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
VII/259 : 6dF galaxy survey final redshift release (Jones+, 2009)
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
J/AJ/131/84 : AGNs and host galaxies information (Vanden Berk+, 2006)
J/ApJ/667/131 : Mass function of active black holes (Greene+, 2007)
J/MNRAS/404/1639 : MILES base models & new line index system (Vazdekis+, 2010)
J/ApJS/199/26 : The 2MASS Redshift Survey (2MRS) (Huchra+, 2012)
J/MNRAS/426/2703 : Type 1 AGN at low z. II. (Stern+, 2012)
J/ApJ/872/134 : A uniformly selected, all-sky, optical AGN cat. (Zaw+, 2019)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- 6dFGS Target identifier (gHHMMSSs-DDMMSS;
<6dFGS gJHHMMSS.s+DDMMSS> in Simbad)
16- 17 A2 --- f_6dFGS Flag on 6dFGS (1)
19- 27 F9.5 deg RAdeg Right Ascension (J2000)
29- 37 F9.5 deg DEdeg [-87/-0.001] Declination (J2000)
39- 47 F9.6 --- z [-0.013/1.9] Spectroscopic redshift
49- 57 A9 --- Type AGN type (2)
59- 63 F5.1 --- SNRV [1.6/154.6] Signal-to-Noise in V-arm
65- 69 F5.1 --- SNRR [1.8/140.1] Signal-to-Noise in R-arm
71- 86 A16 --- 2MASS 2MASS identifier (HHMMSSss-DDMMSSs; J2000)
88- 94 F7.2 --- SSPchi [0.15/7079] Reduced χ2 from SSP fitting
96-109 F14.6 km/s FWHMHaB [315/1247732]?=0 Broad Hα Full-Width
at Half-Maximum
111-122 F12.6 km/s FWHMHbB [1037/12158]?=0 Broad Hβ Full-Width
at Half-Maximum
124-137 F14.6 --- FHb [0/1247725] Hβ line flux (3)
139-152 F14.6 --- FHa [-421/6033194] Hα line flux (3)
154-167 F14.6 --- FO5007 [-955/4163328] [OIII]5007Å line flux (3)
169-181 F13.6 --- FO6300 [-36521/154267] [OI]6300Å line flux (3)
183-196 F14.6 --- FN6584 [-19795/2483006] [NII]6584Å line flux (3)
198-211 F14.6 --- FS6716 [-218796/532579]? [SII]6716Å line flux (3)
213-228 F16.6 --- FS6731 [-19482864/296270] [SII]6731Å line flux (3)
230-241 F12.6 --- e_FHb [27/68917] Uncertainty in FHb
243-255 F13.6 --- e_FHa [129/807922] Uncertainty in FHa
257-268 F12.6 --- e_FO5007 [0/57420] Uncertainty in FO5007
270-282 F13.6 --- e_FO6300 [94/548632] Uncertainty in FO6300
284-296 F13.6 --- e_FN6584 [140/721395] Uncertainty in FN6584
298-310 F13.6 --- e_FS6716 [0/433576] Uncertainty in FS6716
312-325 F14.6 --- e_FS6731 [0/2709903] Uncertainty in FS6731
327-341 F15.6 --- FHaB [234/95139334]? Broad Hα line flux (3)
343-355 F13.6 --- e_FHaB [112/319068]? Uncertainty in FHaB
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Note (1): Flag as follows:
# = "local fitting" was used to estimate the galaxy contribution;
* = Type 1 AGN identified from broad Hβ;
t = Type 1 AGN may be contaminated by telluric absorption in
the [NII]-Hα complex.
Note (2): Type as follows:
Sy1 = Type 1,
K01 = Type 2 with Kewley+ 2001ApJ...556..121K 2001ApJ...556..121K criteria,
K03 = Type 2 with Kauffmann+ 2003MNRAS.346.1055K 2003MNRAS.346.1055K criteria.
LINER = LINERs with the use of [SII]
Sy2 = Seyfert 2 adopting Kewley+ 2006MNRAS.372..961K 2006MNRAS.372..961K criteria.
When [SII] falls within the 6dF wavelength range, a K01 galaxy that
satisfies either the LINERs or Sy2 criteria is marked accordingly in
the Type column.
Note (3): The flux values are not absolute fluxes due to the un-flux-calibrated
spectra. Therefore, the reported fluxes should only be used as ratios.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- 6dFGS Target identifier (gHHMMSSs-DDMMSS;
<6dFGS gJHHMMSS.s+DDMMSS> in Simbad)
17- 32 A16 --- 2MASS 2MASS identifier (HHMMSSss-DDMMSSs; J2000)
34- 42 F9.5 deg RAdeg Right Ascension (J2000)
44- 52 F9.5 deg DEdeg [-87.14/-0.00042] Declination (J2000)
54- 62 F9.6 --- z [-0.4/4.44]?=-9.999 Spectroscopic redshift
64- 66 A3 --- Type Galaxy type (1)
68- 72 F5.1 --- SNRV [-62.9/159.6] Signal-to-Noise in V-arm
74- 78 F5.1 --- SNRR [-29.5/151.2] Signal-to-Noise in R-arm
80- 85 F6.4 --- Prob1 [0.0068/0.13] Likelihood to be a Type 1 AGN
87- 92 F6.4 --- Prob2 [0.005/0.4] Likelihood to be a Type 2 AGN
94- 99 F6.4 --- ProbAGN [0.03/0.5] Likelihood to be an AGN
101-114 F14.6 --- FHb [-200954/4058112] Hβ line flux (2)
116-132 F17.6 --- FHa [-672203662/10949476]? Hα line flux (2)
134-148 F15.6 --- FO5007 [-4482324/8070737] [OIII]5007Å line flux (2)
150-163 F14.6 --- FO6300 [-401264/320594] The [OI]6300Å line flux (2)
165-182 F18.6 --- FN6584 [-1145406696/201548864]? The [NII]6584Å
line flux (2)
184-199 F16.6 --- FS6716 [-20292590/628402]? [SII]6716Å line flux (2)
201-216 F16.6 --- FS6731 [-20292590/759599]? [SII]6731Å line flux (2)
218-231 F14.6 --- e_FHb [0/1293890] Uncertainty in FHb
233-246 F14.6 --- e_FHa [0/3819862] Uncertainty in FHa
248-260 F13.6 --- e_FO5007 [0/669668] Uncertainty in FO5007
262-275 F14.6 --- e_FO6300 [0/3819862] Uncertainty in FO6300
277-290 F14.6 --- e_FN6584 [0/3819862] Uncertainty in FN6584
292-305 F14.6 --- e_FS6716 [0/3819862] Uncertainty in FS6716
307-320 F14.6 --- e_FS6731 [0/3819862] Uncertainty in FS6731
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Note (1): Where "Emi" indicates an emission line galaxy and a blanks indicates
a galaxy with no emission lines.
Note (2): The flux values are not absolute fluxes due to the un-flux-calibrated
spectra. Therefore, the reported fluxes should only be used as ratios.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- 6dFGS Target 6dF identifier (gHHMMSSs-DDMMSS;
<6dFGS gJHHMMSS.s+DDMMSS> in Simbad)
17- 25 F9.5 deg RAdeg Right Ascension (J2000)
27- 35 F9.5 deg DEdeg [-87.13/-0.009] Declination (J2000)
37- 45 F9.6 --- z [-0.09/4.7]?=-9.999 Spectroscopic redshift
47- 62 A16 --- 2MASS 2MASS identifier, if available
(HHMMSSss+DDMMSSs; J2000)
64- 69 F6.4 --- Prob1 [0.1/0.11] Likelihood to be a Type 1 AGN
71- 76 F6.4 --- Prob2 [0.1921] Likelihood to be a Type 2 AGN (1)
78- 83 F6.4 --- ProbAGN [0.3005] Likelihood to be an AGN
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Note (1): satisfying Kewley et al. (2001ApJ...556..121K 2001ApJ...556..121K) criteria.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDs] 17-May-2022