J/ApJS/219/1 Catalog of Type-1 AGNs from SDSS-DR7 (Oh+, 2015)
A new catalog of type 1 AGNs and its implications on the AGN unified model.
Oh K., Yi S.K., Schawinski K., Koss M., Trakhtenbrot B., Soto K.
<Astrophys. J. Suppl. Ser., 219, 1 (2015)>
=2015ApJS..219....1O 2015ApJS..219....1O (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Redshifts ; X-ray sources ; Equivalent widths
Keywords: galaxies: active; galaxies: nuclei; galaxies: Seyfert;
galaxies: statistics; methods: data analysis; quasars: general
Abstract:
We have recently identified a substantial number of type 1 active
galactic nuclei (AGNs) featuring weak broad-line regions (BLRs) at
z<0.2 from detailed analysis of galaxy spectra in the Sloan Digital
Sky Survey Data Release 7. These objects predominantly show a stellar
continuum but also a broad Hα emission line, indicating the
presence of a low-luminosity AGN oriented so that we are viewing the
central engine directly without significant obscuration. These
accreting black holes have previously eluded detection due to their
weak nature. The newly discovered BLR AGNs have increased the number
of known type 1 AGNs by 49%. Some of these new BLR AGNs were detected
with the Chandra X-ray Observatory, and their X-ray properties confirm
that they are indeed type 1 AGNs. Based on our new and more complete
catalog of type 1 AGNs, we derived the type 1 fraction of AGNs as a
function of [OIII]λ5007 emission luminosity and explored the
possible dilution effect on obscured AGNs due to star formation. The
new type 1 AGN fraction shows much more complex behavior with respect
to black hole mass and bolometric luminosity than has been suggested
previously by the existing receding torus model. The type 1 AGN
fraction is sensitive to both of these factors, and there seems to be
a sweet spot (ridge) in the diagram of black hole mass and bolometric
luminosity. Furthermore, we present the possibility that the Eddington
ratio plays a role in determining opening angles.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 83 84 X-ray properties of type 1 AGNs
table9.dat 109 5553 Properties of type 1 AGNs
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See also:
B/chandra : The Chandra Archive Log (CXC, 1999-2014)
IX/45 : The Chandra Source Catalog, Release 1.1 (Evans+ 2012)
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
J/A+A/549/A119 : Black-hole masses of type-1 AGNs (Caccianiga+, 2013)
J/ApJ/778/188 : z<0.4 sources from Chandra/SDSS (Trichas+, 2013)
J/ApJ/772/26 : AGN with WISE. II. The NDWFS Bootes field (Assef+, 2013)
J/MNRAS/423/600 : Type-1 low-z AGN emission properties (Stern+, 2012)
J/ApJ/728/58 : Swift-BAT survey of AGNs (Burlon+, 2011)
J/ApJ/711/284 : Galaxy Zoo: AGN host galaxies (Schawinski+, 2010)
J/ApJ/667/131 : Mass function of active black holes (Greene+, 2007)
J/MNRAS/371/703 : MILES library of empirical spectra (Sanchez-Blazquez+, 2006)
J/AJ/131/84 : AGNs and host galaxies information (Vanden Berk+, 2006)
J/AJ/126/1750 : Seyfert population in SSRS2 (Maia+, 2003)
http://wwwmpa.mpa-garching.mpg.de/SDSS/DR7/ : The MPA-JHU analysis of SDSS DR7
http://gem.yonsei.ac.kr/~ksoh/wordpress : The OSSY database
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 18 I18 --- objID SDSS-DR7 object identifier
20- 24 I5 --- obsID Chandra observation identifier
26- 34 F9.5 deg RAdeg Right Ascension from Chandra (J2000)
36- 44 F9.5 deg DEdeg Declination from Chandra (J2000)
46- 52 F7.5 --- z [0.02/0.2] Redshift
54- 57 I4 ct Ct Chandra counts
59- 63 F5.3 ct/s CRate [0.001/0.6] Chandra count rate
65- 69 F5.2 [10-7W] logL [41/44.2] Log Chandra 2-10 keV luminosity;
in erg/s
71- 74 F4.2 [10-7W] E_logL [0.01/0.23] Upper limit error in logL (2)
76- 79 F4.2 [10-7W] e_logL [0.01/0.45] Lower limit error in logL (2)
81- 83 A3 --- Note Source note(s) (3)
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Note (2): Errors are estimated with the 90% confidence region for a
single interesting parameter.
Note (3): Note as follows:
N = discrimination flag for newly identified type 1 AGN;
3 = previously confirmed source;
p = the photon pileup fraction greater than 10%.
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 18 I18 --- objID SDSS-DR7 object identifier
20- 28 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
30- 38 F9.5 deg DEdeg Declination in decimal degrees (J2000)
40- 46 F7.5 --- z [0.01/0.2] Redshift
48- 55 F8.2 [10-7W] logLOIII [38.5/43.3]?=-9999 Log [OIII] line
luminosity (1)
57- 63 F7.1 km/s FWHM [1028/20254] Broad Hα Full-Width
at Half-Maximum
65- 71 F7.1 km/s e_FWHM [4/42900] Error in FWHM
73- 77 F5.1 0.1nm EW [8.5/834] Broad Hα equivalent width;
Angstroms
79- 83 F5.2 [10-7W] logLHa [40.5/43.4] Log broad Hα line
luminosity (1)
85- 88 F4.2 [Msun] logMbh [6.1/9.3] Log Blackhole mass (2)
90- 93 F4.2 [Msun] E_logMbh [0/1.7] Upper limit error in logMbh
95- 98 F4.2 [Msun] e_logMbh [0/1.1] Lpper limit error in logMbh
100-104 F5.2 [10-7W] logLbol [42/47]?=-9.99 Log bolometric luminosity (1)
106-109 A4 --- Note Source note (3)
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Note (1): In ergs/s. Bolometric luminosity derived from the method developed by
Heckman et al. (2004ApJ...613..109H 2004ApJ...613..109H).
Note (2): Derived from the method developed by Greene & Ho
(2005ApJ...630..122G 2005ApJ...630..122G).
Note (3): Note as follows:
N = newly identified type 1 AGN;
X = identified with Chandra X-ray data;
3 = a SDSS SpecClass 3 object;
H = identified by Hao et al. (2005AJ....129.1795H 2005AJ....129.1795H)
G = Greene & Ho (2007ApJ...667..131G 2007ApJ...667..131G).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 31-Aug-2015