VII/252 SDSS-DR5 quasar catalog (Schneider+, 2007)
The Sloan Digital Sky Survey quasar catalog. IV. Fifth data release.
Schneider D.P., Hall P.B., Richards G.T., Strauss M.A., Vanden Berk D.E.,
Anderson S.F., Brandt W.N., Fan X., Jester S., Gray J., Gunn J.E.,
Subbarao M.U., Thakar A.R., Stoughton C., Szalay A.S., Yanny B., York D.G.,
Bahcall N.A., Barentine J., Blanton M.R., Brewington H., Brinkmann J.,
Brunner R.J., Castander F.J., Csabai I., Frieman J.A., Fukugita M.,
Harvanek M., Hogg D.W., Ivezic Z., Kent S.M., Kleinman S.J., Knapp G.R.,
Kron R.G., Krzesinski J., Long D.C., Lupton R.H., Nitta A., Pier J.R.,
Saxe D.H., Shen Y., Snedden S.A., Weinberg D.H., Wu J.
<Astron. J., 134, 102-117 (2007)>
=2007AJ....134..102S 2007AJ....134..102S
ADC_Keywords: QSOs ; Surveys ; Photometry, SDSS ; Redshifts
Keywords: catalogs ; quasars: general ; surveys
Abstract:
The fourth edition of the Sloan Digital Sky Survey (SDSS) Quasar
Catalog, made from the SDSS Fifth Data Release, contains 77,429
objects; this is an increase of over 30,000 entries since the previous
edition (Schneider et al., Cat. VII/243). The catalog consists of
the objects in the SDSS Fifth Data Release that have luminosities
larger than Mi=-22.0 (in a cosmology with Ho=70km.s-1.Mpc-1,
ΩM=0.3, and ΩΛ=0.7), have at least one emission
line with FWHM larger than 1000km.s-1 or have interesting or complex
absorption features, are fainter than i∼15.0, and have highly reliable
redshifts. The area covered by the catalog is about 5740deg2. The
quasar redshifts range from 0.08 to 5.41, with a median value of 1.48;
the catalog includes 891 quasars at redshifts greater than 4, of which
36 are at redshifts greater than 5. Approximately half of the catalog
quasars have i<19; nearly all have i<21. For each object the catalog
presents positions accurate to better than 0.2" rms per coordinate,
five-band (ugriz) CCD-based photometry with typical accuracy of
0.03mag, and information on the morphology and selection method. The
catalog also contains basic radio, near-infrared, and X-ray emission
properties of the quasars, when available, from other large-area
surveys. The calibrated digital spectra cover the wavelength region
3800-9200Å at a spectral resolution of about 2000; the spectra can
be retrieved from the public database using the information provided
in the catalog. The average SDSS colors of quasars as a function of
redshift, derived from the catalog entries, are presented in tabular
form. Approximately 96% of the objects in the catalog were discovered
by the SDSS.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
dr5qso.dat 472 77429 The SDSS Quasar Catalog IV, DR5
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See also:
II/276 : SDSS Photometric Catalog, Release 5 (Adelman-McCarthy+, 2007)
J/ApJ/680/169 : SDSS DR5 virial black hole masses (Shen+, 2008)
http://www.sdss.org : SDSSHome Page
Byte-by-byte Description of file: dr5qso.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- SDSS SDSS DR5 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- 54 F6.3 mag umag ?=0 SDSS BEST u band PSF magnitude (2)
56- 60 F5.3 mag e_umag Error in B-umag
62- 67 F6.3 mag gmag ?=0 SDSS BEST g band PSF magnitude (2)
69- 73 F5.3 mag e_gmag Error in B-gmag
75- 80 F6.3 mag rmag ?=0 SDSS BEST r band PSF magnitude (2)
82- 86 F5.3 mag e_rmag Error in B-rmag
88- 93 F6.3 mag imag ?=0 SDSS BEST i band PSF magnitude (2)
95- 99 F5.3 mag e_imag Error in B-imag
101-106 F6.3 mag zmag ?=0 SDSS BEST z band PSF magnitude (2)
108-112 F5.3 mag e_zmag Error in B-zmag
114-119 F6.3 mag Au Galactic absorption in u band (3)
121-126 F6.3 [cm-2] logHI Log of Galactic HI column density
128-133 F6.3 mag F20cm ?=0 FIRST Peak flux density (ABmag) at 20cm (4)
135-141 F7.3 --- w_F20cm The S/N ratio for FIRST flux
143-148 F6.3 arcsec sepR SDSS/FIRST separation
150-151 I2 --- fRo [0/1] FIRST flux at optical position but no
FIRST source flag (1=detectable flux)
153-154 I2 --- fR1 [0/1] FIRST source 2-30" from optical
position flag (1=source exists)
156-162 F7.3 [ct/s] logX ?=-9.000 RASS BSC/FSC full band count rate (5)
164-169 F6.3 --- w_logX The S/N ratio for RASS count rate
171-176 F6.3 arcsec sepX SDSS/RASS separation
178-183 F6.3 mag Jmag ?=0.000 2MASS J band magnitude (6)
185-189 F5.3 mag e_Jmag ?=0.000 Error in Jmag
191-196 F6.3 mag Hmag ?=0.000 2MASS H band magnitude (6)
198-202 F5.3 mag e_Hmag ?=0.000 Error in Hmag
204-209 F6.3 mag Kmag ?=0.000 2MASS K band magnitude (6)
211-215 F5.3 mag e_Kmag ?=0.000 Error in Kmag
217-222 F6.3 arcsec sepH SDSS/2MASS separation
224-230 F7.3 mag iMAG Absolute i band magnitude (7)
232-237 F6.3 mag D(g-i) ?=-9.0 Offset of quasar (g-i) from
distribution (g-i) mode (8)
240 I1 --- Mph [0/1] Morphology flag (1=extended source)
243 I1 --- S1 [0/1] SCIENCEPRIMARY flag (1=SCIENCEPRIMARY)
246 I1 --- mode [0-3] SDSS MODE (blends, overlapping scans)
flag (9)
249 I1 --- utf [0/1] Uniform target selection flag (10)
251-261 I11 --- TflagB BEST target selection flag
264 I1 --- Lz [0/1] Low-z Quasar (color selection only)
target flag (1=targeted as Low-z Quasar)
267 I1 --- Hz [0/1] High-z Quasar (color selection only)
target flag (1=targeted as High-z Quasar)
270 I1 --- fR [0/1] FIRST target flag (1=targeted)
273 I1 --- fX [0/1] ROSAT target flag (1=targeted)
276 I1 --- fS [0/1] Serendipity target flag (1=targeted)
279 I1 --- f* [0/1] Star target flag (1=targeted)
282 I1 --- fG [0/1] Galaxy target flag (1=targeted)
284-288 I5 --- run SDSS Imaging Run Number for photometric
measurements
290-294 I5 d MJD-Im Modified Julian Date of imaging observation
296-300 I5 d MJD-Sp Modified Julian Date of spectroscopic
observation
302-305 I4 --- Pnum Spectroscopic Plate Number
307-310 I4 --- Fnum Spectroscopic Fiber Number
312-314 I3 --- rerun SDSS Photometric Processing Rerun Number
316-317 I2 --- Cam SDSS Camera Column Number
319-322 I4 --- Frame SDSS Frame Number
324-327 I4 --- Obj SDSS Object Number
329-339 I11 --- Tflag TARGET target selection flag
342 I1 --- LzT [0/1] Low-z Quasar (color selection only)
target flag (1=targeted as Low-z Quasar)
345 I1 --- HzT [0/1] High-z Quasar (color selection only)
target flag (1=targeted as High-z Quasar)
348 I1 --- fRT [0/1] FIRST target flag (1=targeted)
351 I1 --- fXT [0/1] ROSAT target flag (1=targeted)
354 I1 --- fST [0/1] Serendipity target flag (1=targeted)
357 I1 --- f*T [0/1] Star target flag (1=targeted)
360 I1 --- fGT [0/1] Galaxy target flag (1=targeted)
362-367 F6.3 mag uPSF ?=99.999 SDSS TARGET u band PSF magnitude (2)
369-373 F5.3 mag e_uPSF ?=9.999 Error in T-umag
375-380 F6.3 mag gPSF ?=99.999 SDSS TARGET g band PSF magnitude (2)
382-386 F5.3 mag e_gPSF ?=9.999 Error in T-gmag
388-393 F6.3 mag rPSF ?=99.999 SDSS TARGET r band PSF magnitude (2)
395-399 F5.3 mag e_rPSF ?=9.999 Error in T-rmag
401-406 F6.3 mag iPSF ?=99.999 SDSS TARGET i band PSF magnitude (2)
408-412 F5.3 mag e_iPSF ?=9.999 Error in T-imag
414-419 F6.3 mag zPSF ?=99.999 SDSS TARGET z band PSF magnitude (2)
421-425 F5.3 mag e_zPSF ?=9.999 Error in T-zmag
429-446 A18 --- SpOID The 64-bit integer Spectroscopic
Identification flag
448-472 A25 --- Prev Object Name if previously published (11)
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Note (1): In the HHMMSS.ss+DDMMSS.s (J2000; truncated coordinates) format.
Note (2): SDSS photometric measurements are asinh magnitudes (Lupton, Gunn,
and Szalay, 1999AJ....118.1406L 1999AJ....118.1406L) and are normalized (to ∼3% accuracy)
to the AB-magnitude system (Oke and Gunn, 1983ApJ...266..713O 1983ApJ...266..713O). Note
that the ugriz magnitudes are not corrected for Galactic absorption.
A "0.000" indicates that the value couldn't be retrieved from the SDSS
database.
Note (3): Where Ag, Ar, Ai, Az = 0.736, 0.534, 0.405, 0.287xAu.
Note (4): Where ABmag=-2.5log10[fnu/3631Jy].
Values of "0.000" or "-1.000" indicate no detection and
not in FIRST survey area, respectively.
Note (5): From ROSAT All Sky Survey Bright and Faint source catalogs.
A "-9.000" indicates no detection.
Note (6): All 2MASS data are from the 2MASS All-Sky Data Release Point
Source Catalog (PSC) 2003 March 25 (Cat. II/246). Note that 2MASS
measurements are Vega-based, not AB, magnitudes. A "0.000" value
indicates no detection.
Note (7): For H0=70.0, ΩM=0.300, ΩL=0.700, αQ=-0.50.
Note (8): Of quasars at this redshift. A value of -9.0 indicates too few
quasars at redshift to form mean relation. All colors corrected for
Galactic extinction.
Note (9): SDSS MODE flag as follows:
1 = Primary object
2 = Secondary observation
3 = Family observation
Note (10): Uniform target selection flag as follows:
0 = not selected with final algorithm
1 = selected with final algorithm
Note (11): An "SDSS" in this column indicates that the object is a
previously published SDSS discovery.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 02-May-2008