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J/AJ/131/84        AGNs and host galaxies information       (Vanden Berk+, 2006)

Spectral decomposition of broad-line AGNs and host galaxies. Vanden Berk D.E., Shen J., Yip C.-W., Schneider D.P., Connolly A.J., Burton R.E., Jester S., Hall P.B., Szalay A.S., Brinkmann J. <Astron. J., 131, 84-99 (2006)> =2006AJ....131...84V
ADC_Keywords: Active gal. nuclei ; QSOs ; Photometry, SDSS Keywords: galaxies: active - quasars: general - surveys - techniques: spectroscopic Abstract: Using an eigenspectrum decomposition technique, we separate the host galaxy from the broad-line active galactic nucleus (AGN) in a set of 4666 spectra from the Sloan Digital Sky Survey (SDSS), from redshifts near zero up to about 0.75. The decomposition technique uses separate sets of galaxy and quasar eigenspectra to efficiently and reliably separate the AGN and host spectroscopic components. The technique accurately reproduces the host galaxy spectrum, its contributing fraction, and its classification. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 285 11647 AGN and host galaxy information
See also: II/259 : The SDSS Photometric Catalog, Release 3 (Abazajian+ 2005) VII/243 : SDSS quasar catalog. III. (Schneider+, 2005) J/AJ/122/503 : SDSS u*g*r*i*z* photometry and redshift of QSOs (Anderson+ 2001) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 18 A18 --- SDSSJ Object Designation (1) 20- 29 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) 31- 40 F10.6 deg DEdeg Declination in decimal degrees (J2000) 42- 47 F6.4 --- z Redshift 49- 52 I4 --- Plate Spectroscopic Plate Number 54- 56 I3 --- Fib Spectroscopic Fiber Number 58- 62 I5 d MJD Modified Julian Date of spectroscopic observation 64 A1 --- r/u [ru] resolved/unresolved Morphology 65- 74 A10 --- --- [nresolved ] 76- 80 F5.2 --- S/Ni Average Spectroscopic (S/N)/pix in i band 82- 87 F6.3 mag gmag.p The g band Point Spread Function magnitude 89- 93 F5.3 mag e_gmag.p The error in gmagPSF 95-100 F6.3 mag rmag.p The r Point Spread Function magnitude 102-106 F5.3 mag e_rmag.p The error in rmagPSF 108-113 F6.3 mag imag.p The i Point Spread Function magnitude 115-119 F5.3 mag e_imag.p The error in imagPSF 121-126 F6.3 mag gmagSp The g band Spectroscopic magnitude 128-133 F6.3 mag rmagSp The r band Spectroscopic magnitude 135-140 F6.3 mag imagSp The i band Spectroscopic magnitude 142-147 F6.3 mag gmag The g band Cmodel magnitude 149-153 F5.3 mag e_gmag The error in gmagCmod 155-160 F6.3 mag rmag The r band Cmodel magnitude 162-166 F5.3 mag e_rmag The error in rmagCmod 168-173 F6.3 mag imag The i band Cmodel magnitude 175-179 F5.3 mag e_imag The error in imagCmod 181-186 F6.3 mag Ag The g band Galactic absorption 188-193 F6.3 mag Ar The r band Galactic absorption 195-200 F6.3 mag Ai The i band Galactic absorption 202-207 F6.2 mag gMAG ?=0 The g band AGN component absolute mag. (2) 209-214 F6.2 mag rMAG ?=0 The r band AGN component absolute mag. (2) 216-221 F6.2 mag gMAG.H ?=0 The g band Host Galaxy absolute mag. (2) 223-228 F6.2 mag rMAG.H ?=0 The r band Host Galaxy absolute magnitude (2) 230-235 F6.2 mag gMAGc Correction applied g band AGN absolute magnitude (2) 237-242 F6.2 mag rMAGc Correction applied r band AGN absolute magnitude (2) 244-249 F6.2 mag gMAG.Hc ?=-99.00 Correction applied to g band Host absolute magnitude (2) 251-256 F6.2 mag rMAG.Hc ?=-99.00 Correction applied to r band Host absolute magnitude (2) 258-261 F4.2 --- Fl.H Flux fraction from 4160-4210 Angstroms from Host Galaxy (2) 263-267 F5.1 deg phi AGN first classification angle (2) (3) 269-273 F5.1 deg theta AGN second classification angle (2) (3) 275-279 F5.1 deg phi.H Host Galaxy first classification angle (2) (3) 281-285 F5.1 deg theta.H Host Galaxy second classification angle (2) (3)
Note (1): Where name is SDSSJ J2000; truncated coordinates. Note (2): Default values, set to zeros, are given for entries with a non-physical spectroscopic decomposition. Note (3): Following Connolly et al. (1995AJ....110.1071C), we define two angles, called classification angles, which are formed from the first three galaxy eigencoefficients: φ=tan-1(a2/a1) θ=cos-1(a3)
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 17-Aug-2006
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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