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J/ApJ/708/427      Type 2 AGNs with double-peaked [OIII] lines      (Liu+, 2010)

Type 2 active galactic nuclei with double-peaked [O III] lines: narrow-line region kinematics or merging supermassive black hole pairs? Liu X., Shen Y., Strauss M.A., Greene J.E. <Astrophys. J., 708, 427-434 (2010)> =2010ApJ...708..427L
ADC_Keywords: Redshifts ; Galaxies, spectra ; Active gal. nuclei Keywords: black hole physics - cosmology: observations - galaxies: active - quasars: general - surveys Abstract: We present a sample of 167 type 2 active galactic nuclei (AGNs) with double-peaked [OIII]4959,5007 narrow emission lines, selected from the Seventh Data Release of the Sloan Digital Sky Survey. The double-peaked profiles can be well modeled by two velocity components, blueshifted and redshifted from the systemic velocity. Half of these objects have a more prominent redshifted component. In cases where the Hβ emission line is strong, it also shows two velocity components whose line-of-sight (LOS) velocity offsets are consistent with those of [OIII]. The relative LOS velocity offset between the two components is typically a few hundred km/s, larger by a factor of ∼1.5 than the line full width at half maximum of each component. The offset correlates with the host stellar velocity dispersion σ*. The host galaxies of this sample show systematically larger σ*, stellar masses, and concentrations, and older luminosity-weighted mean stellar ages than a regular type 2 AGN sample matched in redshift, [OIII]5007 equivalent width, and luminosity; they show no significant difference in radio properties. These double-peaked features could be due to narrow-line region kinematics, or binary black holes. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 73 167 The sample of type-2 AGNs
See also: II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) J/A+A/534/A110 : Type-2 AGN from XMM-COSMOS bolometric output (Lusso+, 2011) J/A+A/510/A56 : zCOSMOS type-2 AGN (Bongiorno, 2010) J/MNRAS/399/1206 : SWIRE/SDSS quasars. II. Type 2 AGN (Hatziminaoglou+, 2009) J/ApJ/705/L76 : AGNs with double-peaked [OIII] lines (Wang+, 2009) J/AJ/136/2373 : Type 2 quasars from SDSS (Reyes+, 2008) J/ApJ/549/155 : [OIII] emission in a sample of AGNs (Nagao+, 2001) : SDSS home page : MPA-JHU SDSS DR7 home page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 19 A19 --- SDSS SDSS designation ( 21- 24 I4 --- Plate Spectroscopic plate number 26- 28 I3 --- Fiber Fiber identification 30- 34 I5 d MJD Modified Julian Date 35 A1 --- f_SDSS [f] Flag on SDSS J130128.76-005804.3 (1) 37- 42 F6.4 --- z Redshift from the specBS pipeline (2) 44- 46 I3 km/s sigma ?=0 Host stellar velocity dispersion (3) 48- 50 I3 km/s FWHM1 ?=0 Blueshifted [OIII] component FWHM (4) 52- 54 I3 km/s FWHM2 ?=0 Redshifted [OIII] component FWHM (4) 56- 59 I4 km/s VOIII1 ?=0 Blueshifted [OIII] component velocity offset (5) 61- 63 I3 km/s VOIII2 ?=0 Redshifted [OIII] component velocity offset (5) 65- 68 I4 km/s VHb1 ?=0 Blueshifted Hβ component velocity offset (6) 70- 73 I4 km/s VHb2 ?=0 Redshifted Hβ component velocity offset (6)
Note (1): The plate-MJD-fiber found in the SDSS-DR7 for this object is: 293-51994-016 and not 293-51689-007 as found in the paper; table corrected at CDS. Note (2): Our parent sample is the MPA-JHU SDSS DR7 galaxy sample drawn from the SDSS DR7 spectroscopic database (Abazajian et al. 2009, Cat. II/294); those include objects spectrally classified as galaxies by the specBS pipeline (Adelman-McCarthy et al. 2008, Cat. II/282) or quasars that are targeted as galaxies (Strauss et al. 2002AJ....124.1810S; Eisenstein et al. 2001AJ....122.2267E) and have redshifts z<0.7. We adopt redshifts z and stellar velocity dispersions σ* from the specBS pipeline. We have checked the accuracy of the redshift by refitting the stellar continuum with galaxy templates (Liu et al. 2009ApJ...702.1098L), as well as comparing multiple epoch spectra of the same objects. See section 2.1 for further details. Note (3): The typical uncertainty is ∼15km/s. A zero is given if the quantity is unmeasurable. Note (4): The typical statistical error is ∼10km/s. A zero is given if the quantity is unmeasurable. Note (5): The typical statistical error is ∼5km/s. A zero is given if the quantity is unmeasurable. Note (6): The typical statistical error is generally a few times larger than in [OIII] since Hβ is weaker than [OIII]. A zero is given if the quantity is unmeasurable.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 01-Feb-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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