J/ApJ/716/866 SDSS search for binary AGN (Smith+, 2010)
A search for binary active galactic nuclei: double-peaked [O III] AGNs in the
Sloan Digital Sky Survey.
Smith K.L., Shields G.A., Bonning E.W., McMullen C.C., Rosario D.J.,
Salviander S.
<Astrophys. J., 716, 866-877 (2010)>
=2010ApJ...716..866S 2010ApJ...716..866S
ADC_Keywords: Active gal. nuclei ; Redshifts ; Radio sources ; Spectroscopy
Keywords: black hole physics - galaxies: active - quasars: general
Abstract:
We present active galactic nuclei (AGNs) from the Sloan Digital Sky
Survey (SDSS) having double-peaked profiles of [OIII]5007,4959 and
other narrow emission lines, motivated by the prospect of finding
candidate binary AGNs. These objects were identified by means of a
visual examination of 21592 quasars at z<0.7 in SDSS Data Release 7
(DR7). Of the spectra with adequate signal-to-noise, 148 spectra
exhibit a double-peaked [OIII] profile. Of these, 86 are Type 1 AGNs
and 62 are Type 2 AGNs. Only two give the appearance of possibly being
optically resolved double AGNs in the SDSS images, but many show close
companions or signs of recent interaction. Radio-detected quasars are
three times more likely to exhibit a double-peaked [OIII] profile than
quasars with no detected radio flux, suggesting a role for jet
interactions in producing the double-peaked profiles. Of the 66
broad-line (Type 1) AGNs that are undetected in the FIRST survey, 0.9%
show double-peaked [OIII] profiles.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 59 148 Double-peaked AGNs
table2.dat 46 52 Radio flux and luminosity
table3.dat 29 78 λ5007 component fluxes
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See also:
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
J/ApJ/708/427 : Type 2 AGNs with double-peaked [OIII] lines (Liu+, 2010)
J/A+A/510/A56 : zCOSMOS type-2 AGN (Bongiorno, 2010)
J/ApJ/705/L76 : AGNs with double-peaked [OIII] lines (Wang+, 2009)
J/ApJ/693/1554 : Double QSOs: merger scenarios (Foreman+, 2009)
J/ApJ/614/91 : Black hole mass and accretion rate of AGNs (Wu+, 2004)
J/ApJ/549/155 : [OIII] emission in a sample of AGNs (Nagao+, 2001)
http://www.sdss.org/ : SDSS home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SDSS SDSS-DR7 name (JHHMMSS.ss+DDMMSS.s)
20 A1 --- f_SDSS [*] *: image available in Figure 3 of the paper
22- 26 F5.3 --- z SDSS-DR7 redshift
28- 31 I4 km/s Vel Rest-frame velocity separation of the two peaks
of [OIII]5007
33- 37 F5.2 [10-7W] logL Optical continuum luminosity from the SDSS
spectrum log(νLν)
39- 41 F3.1 --- Type [1/2] AGN type
43 A1 --- Q [m/g] Quality flag of the double peak (g=good
or m=marginal) (1)
45- 51 F7.5 --- zr Redshift of the red peak of λ5007
53- 59 F7.5 --- zh ? Host galaxy redshift
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Note (1): "Marginal" objects are questionable cases due to low S/N, bad sky
subtraction, and most often, failure of λ4959 to reproduce
the intensity ratio of the components in λ5007.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- SDSS SDSS-DR7 name (JHHMMSS.ss+DDMMSS.s)
21- 25 F5.3 --- z SDSS-DR7 redshift
27- 33 F7.2 mJy Snu Observed 20cm flux density from FIRST
35- 39 F5.2 [10-7W/Hz] logLnu Source specific luminosity at 6cm rest
wavelength (assuming Lν∝ν-0.7)
41- 44 F4.2 --- logR Radio loudness parameter R (Kellermann et al.
1989AJ.....98.1195K 1989AJ.....98.1195K)
46 I1 --- Type [1/2] AGN type
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SDSS SDSS-DR7 name (JHHMMSS.ss+DDMMSS.s)
21- 24 I4 10-20W/m2 Fr Flux of the red component of the 5007Å
emission line (in 10-17erg/cm2/s)
26- 29 I4 10-20W/m2 Fb Flux of the blue component of the 5007Å
emission line (in 10-17erg/cm2/s)
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 31-May-2012