J/AJ/133/313 AGN from RASS and SDSS DR5 (Anderson+, 2007)
A large, uniform sample of x-ray-emitting active galactic nuclei from the ROSAT All Sky and Sloan Digital Sky Surveys: the Data Release 5 sample. Anderson S.F., Margon B., Voges W., Plotkin R.M., Syphers D., Haggard D., Collinge M.J., Meyer J., Strauss M.A., Agueros M.A., Hall P.B., Homer L., Ivezic Z., Richards G.T., Richmond M.W., Schneider D.P., Stinson G., Vanden Berk D.E., York D.G. <Astron. J., 133, 313-329 (2007)> =2007AJ....133..313A
ADC_Keywords: Surveys ; QSOs ; X-ray sources; Photometry ; Redshifts Keywords: catalogs - quasars: general - surveys; X-rays Abstract: We describe further results of a program aimed at yielding ∼104 fully characterized optical identifications of ROSAT X-ray sources. Our program employs X-ray data from the ROSAT All Sky Survey (RASS) and both optical imaging and spectroscopic data from the Sloan Digital Sky Survey (SDSS). RASS/SDSS data from 5740deg2 of sky spectroscopically covered in SDSS Data Release 5 provide an expanded catalog of 7000 confirmed quasars and other active galactic nuclei (AGNs) that are probable RASS identifications. Again, in our expanded catalog the identifications as X-ray sources are statistically secure, with only a few percent of the SDSS AGNs likely to be randomly superposed on unrelated RASS X-ray sources. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 108 6224 Observed Parameters of Broad-Line RASS/SDSS AGN table2.dat 116 6224 Derived Parameters of Broad-Line RASS/SDSS AGN table3.dat 108 515 Observed Parameters of RASS/SDSS AGN Having Narrower Permitted Emission table4.dat 116 515 Derived Parameters of RASS/SDSS AGN Having Narrower Permitted Emission table5.dat 108 266 Observed Parameters of RASS/SDSS BL Lac Candidates table6.dat 116 266 Derived Parameters of RASS/SDSS BL Lac Candidates
See also: II/276 : The SDSS Photometric Catalog, Release 5 (Adelman-McCarthy+, 2007) IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999) IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000) J/AJ/126/2209 : X-ray AGN from RASS and SDSS (Anderson+, 2003) Byte-by-byte Description of file: table.dat
Bytes Format Units Label Explanations
1- 15 A15 --- RASS RASS X-ray source name, HHMMSS.s+DDMMSS (G1) 17- 34 A18 --- SDSS SDSS optical counterpart name, HHMMSS.ss+DDMMSS.s (G1) 36- 40 F5.2 mag umag SDSS u band PSF magnitude 42- 46 F5.2 mag gmag SDSS g band PSF magnitude 48- 52 F5.2 mag rmag SDSS r band PSF magnitude 54- 58 F5.2 mag imag SDSS i band PSF magnitude 60- 64 F5.2 mag zmag SDSS z band PSF magnitude 66 I1 --- St [3/6] SDSS imaging morphology parameter (6=stellar/unresolved, 3=extended/resolved) 68- 72 F5.3 --- z ? Redshift 74- 79 F6.4 ct/s CRate X-ray count rate (3) 81- 84 I4 s Exp The X-ray exposure time 86- 90 F5.2 --- HR1 The X-ray hardness ratio 1 (4) 92- 96 F5.2 --- HR2 The X-ray hardness ratio 2 (4) 98-101 I4 --- L The X-ray source detection likelihood 103-108 F6.2 10-16W/m2 FX Absorbed X-ray flux (5)
Note (3): In the 0.1-2.4keV broadband, corrected for vignetting. Note (4): The usual ROSAT PSPC HR1 hardness ratio defined as HR1=(B-A)/(B+A), where A = count rate in pulse height amplitude (PHA) range 11-41, and B = count rate in PHA range 52-201. The usual ROSAT PSPC HR2 hardness ratio defined as HR2=(D-C)/(D+C), where C = count rate in PHA range 52-90, and D = count rate in PHA range 91-201. Note (5): In the 0.1-2.4keV band and in units of 10-13erg/s/cm2. Assuming a power-law X-ray spectrum with energy index αx=1.5, typical of low redshift quasars in the RASS PSPC bandpass (e.g., see Schartel et al. 1996MNRAS.283.1015S).
Byte-by-byte Description of file: table.dat
Bytes Format Units Label Explanations
1- 15 A15 --- RASS RASS X-ray source name, HHMMSS.s+DDMMSS (G1) 17- 34 A18 --- SDSS SDSS optical counterpart name, HHMMSS.ss+DDMMSS.s (G1) 36- 40 F5.2 mag g0mag SDSS g band PSF magnitude (2) 42- 46 F5.3 --- z ? Redshift 48- 53 F6.2 10-16W/m2 FXcor Corrected X-ray flux (3) 55- 59 F5.2 [10-7W] logLX ? Log of broadband (0.1-2.4kev) X-ray luminosity in units of erg/s (4) 61- 65 F5.2 [10-7W/Hz] LogL2500 ? Log of 2500Å monochromatic optical luminosity in units of erg/s/Hz (4) 67- 71 F5.2 [10-7W/Hz] logL2keV ? Log of 2keV monochromatic X-ray luminosity in units of erg/s/Hz (4) 73- 76 F4.2 --- alpha Slope of a hypothetical power law from 2500Å to 2keV 78-116 A39 --- Comm Additional comment (5)
Note (2): Extinction corrected according to the reddening maps of Schlegel, Finkbeiner, & Davis (1998ApJ...500..525S). Note (3): Corrected for absorption within the Galaxy, with X-ray absorbing columns estimated using the NH column density measures of the Stark et al. (1992) 21cm maps. In units of 10-13erg/s/cm2. Note (4): We adopt values of H0=70 km/s/Mpc, ΩM=0.3, and ΩΛ=0.7. In converting from corrected broadband (X-ray 0.1-2.4kev, and optical g-band) fluxes to luminosities, we again assume an X-ray power-law spectrum with energy index αx=1.5, and an optical power-law with energy index αo=0.5. Note (5): For example noting selected objects that are radio sources, listing an alternate name (shortened, if needed, to the first 20 characters) taken from NED for about 10% of the quasars, and noting the ∼1.5% of the cases where two of our cataloged AGN fall within the same RASS error circle. (The latter are denoted by `ambigID' in the comments).
Global notes: Note (G1): From position (J2000) using RA/Dec nomenclature.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 11-Dec-2008
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