J/A+A/427/387 QORG catalog of radio/X-ray sources (Flesch+, 2004)
An all-sky optical catalogue of radio / X-ray sources.
Flesch E., Hardcastle M.J.
<Astron. Astrophys. 427, 387 (2004)>
=2004A&A...427..387F 2004A&A...427..387F
ADC_Keywords: Surveys ; QSOs ; Radio sources ; X-ray sources
Keywords: catalogs - galaxies: active - galaxies: quasars: general
Description:
The QUASARS.ORG Catalogues align and overlay the year 2001/2 releases
of the ROSAT HRI, RASS, PSPC and WGA X-ray catalogues, the NVSS
(2002), FIRST (2003) and SUMSS (2003) radio catalogues, the Veron QSO
catalogue (2003) and various galaxy/star reference catalogues onto the
optical APM and USNO-A catalogues. These catalogues display calculated
percentage probabilities for each optical radio/X-ray associated
object of its likelihood of being a quasar, galaxy, star, or erroneous
radio/X-ray association.
The main Master catalogue (master.dat) displays all 501,761
radio/X-ray associated optical objects and known quasars which are
optically detected in APM/USNO-A. Up to six radio/X-ray catalog
identifications are presented for each optical object, plus any double
radio lobes (21,498 of these). These are superimposed (and laterally
fitted) onto a 670,925,779-object optical background which combines
APM and USNO-A data. The Free-Lunch catalogue is a concise
easy-to-read variant of the Master catalogue showcasing just one X-ray
and/or radio identification for each object. This catalogue is the
original version which was publicized to show astronomers that there
*is* a free lunch after all! There is also a subset catalogue of QSO
candidates, and a subset catalogue of known QSOs/galaxies/stars.
Objects presented in this catalogue are those optical APM/USNO-A
objects which are associated with X-ray/radio detections, or any
optically-found catalogued QSO/AGN/Bl Lac objects, with confidence
>40% of being a radio/X-ray emitting optical object. There are 501,761
objects included in all (including 48,285 catalogued quasars),
representing the 99.4% coverage of the sky available from the APM and
USNO-A.
Each object is shown as one line bearing the position in equatorial
coordinates, red and blue optical magnitudes (recalibrated) and PSF
class, calculated probabilities of the object being, separately, a
quasar, galaxy, star, or erroneous radio/X-ray association, any radio
identification from each of the NVSS, FIRST and SUMSS surveys,
including candidate double-lobe detections, any X-ray identification
from each of the ROSAT HRI, RASS, PSPC and WGA surveys, including
fluxes and field shifts of those identifications, plus, if already
catalogued, the object name and redshift where applicable.
The QORG catalogue and supporting data can be accessed from the
catalogue home page at http://quasars.org/qorg-data.htm
Questions or comments may be directed to
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
master.dat 475 501761 The Master catalogue, with comprehensive
listings of detections from 7 surveys.
Also lists 2 radio lobes if applicable.
freelunc.dat 131 501761 Same, but only 1 radio and/or 1 X-ray
detection presented per object.
knownobj.dat 131 119816 Already-catalogued QSOs, galaxies etc.,
with associations to radio/Xray sources.
qsocand.dat 104 86009 QSO candidates of 40%-100% confidence
of association with radio/X-ray sources.
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See also:
http://quasars.org/qorg-data.htm : QORG home page
http://www.ast.cam.ac.uk/~apmcat : APM home page
https://www.usno.navy.mil/USNO : USNO home page
http://www.cv.nrao.edu/nvss : NVSS home page
http://sundog.stsci.edu : FIRST home page
http://www.xray.mpe.mpg.de/rosat/rra : HRI & PSPC home page
http://wgacat.gsfc.nasa.gov/wgacat/wgacat.html : WGA home page
http://www.xray.mpe.mpg.de/rosat/survey/rass-fsc : RASS-FSC home page
http://www.xray.mpe.mpg.de/rosat/survey/rass-bsc : RASS-BSC home page
http://www.astrop.physics.usyd.edu.au/SUMSS/index.html : SUMSS home page
http://www.obs-hp.fr/www/catalogues/veron2_11/veron2_11.html : Veron home page
http://leda.univ-lyon1.fr : Principal Galaxy Catalogue (LEDA) home page
http://www.sdss.org : Sloan Digital Sky Survey
http://www.2dfquasar.org : 2dF QSO Redshift Survey
http://www.mso.anu.edu.au/2dFGRS : 2dF Galaxy Redshift Survey
http://nedwww.ipac.caltech.edu : NED
http://cfa-www.harvard.edu/~huchra : CfA Redshift Catalogue
http://www-astro.physics.ox.ac.uk/~wjs/pscz.html : IRAS PSCz Redshift Survey
VII/221 : PSCz catalog (Saunders+, 2000)
VII/235 : Quasars and Active Galactic Nuclei (11th Ed.) (Veron+, 2003)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)
VIII/70 : Sydney University Molonglo Sky Survey (SUMSS) (Mauch+ 2003)
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)
Byte-by-byte Description of file: master.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension J2000 (hours) (G1)
3- 4 I2 min RAm Right Ascension J2000 (minutes)
5- 8 F4.1 s RAs Right Ascension J2000 (seconds)
9 A1 --- DE- Declination J2000 (sign)
10- 11 I2 deg DEd Declination J2000 (degrees) (G1)
12- 13 I2 arcmin DEm Declination J2000 (minutes)
14- 15 I2 arcsec DEs Declination J2000 (seconds)
17- 19 A3 --- Obj Nature of object and any association (G2)
20 A1 --- n_Rmag [(]
21- 24 F4.1 mag Rmag ?=0. Red optical magnitude (G3)
25 A1 --- --- [()]
26- 29 F4.1 mag Bmag ?=0. Blue optical magnitude (G3)
30 A1 --- --- [)]
31- 33 A3 --- Comm Comment on optical object (G4)
34 A1 --- Rpsf Red optical PSF class (G5)
36 A1 --- Bpsf Blue optical PSF class (G5)
38- 58 A21 --- Name ID from the literature, where existing.
59- 61 I3 % QSOpct ? Confidence that the radio/X-ray association
shows this object to be a quasar (G6)
62- 64 I3 % galpct ? Confidence (as above) that obj is galaxy (G6)
65- 67 I3 % starpct ? Confidence (as above) that obj is a star (G6)
68- 70 I3 % errpct ? Probability that this is a false association,
i.e., coincidental radio/X-ray & optical (G7)
71- 76 F6.3 --- z ? Redshift from the literature.
78- 98 A21 --- HRIID ID from the ROSAT HRI survey (Cat. IX/28)
99-103 I5 ct/h hrate ? Count rate of the HRI source (G9)
105-106 I2 arcsec hdist ? Distance from HRI detection to optical object
108-110 I3 deg htheta ? Angle (N thru E) from optical obj to detection
111-113 I3 % hconf ? Confidence that this is a true
association (G7)
115-130 A16 --- hfield HRI field ID of this detection.
131-133 I3 arcsec hrmove ? R.A. arcsecs of the HRI field shift (G10)
134-136 I3 arcsec hdmove ? Decl arcsecs of the HRI field shift (G10)
138-158 A21 --- RASSID ID from the ROSAT RASS survey (Cat. IX/10)
159-163 I5 ct/h rrate ? Count rate of the RASS source (G9)
165-166 I2 arcsec rdist ? Distance from RASS detection to optical object
168-170 I3 deg rtheta ? Angle (N thru E) from optical obj to detection
171-173 I3 % rconf ? Confidence that this is a true
association (G7)
175-190 A16 --- rfield RASS field ID of this detection.
191-193 I3 arcsec rrmove ? R.A. arcsecs of the RASS field shift (G10)
194-196 I3 arcsec rdmove ? Decl arcsecs of the RASS field shift (G10)
198-218 A21 --- PSPCID ID from the ROSAT PSPC survey (Cat. IX/30)
219-223 I5 ct/h prate ? Count rate of the PSPC source (G9)
225-226 I2 arcsec pdist ? Distance from PSPC detection to optical object
228-230 I3 deg ptheta ? Angle (N thru E) from optical obj to detection
231-233 I3 % pconf ? Confidence that this is a true
association (G7)
235-250 A16 --- pfield PSPC field ID of this detection.
251-253 I3 arcsec prmove ? R.A. arcsecs of the PSPC field shift (G10)
254-256 I3 arcsec pdmove ? Decl arcsecs of the PSPC field shift (G10)
258-278 A21 --- WGAID ID from the WGA (PSPC data) catalogue (IX/31)
279-283 I5 ct/h wrate ? Count rate of the WGA source (G9)
285-286 I2 arcsec wdist ? Distance from WGA detection to optical object
288-290 I3 deg wtheta ? Angle (N thru E) from optical obj to detection
291-293 I3 % wconf ? Confidence that this is a true
association (G7)
295-310 A16 --- wfield WGA field ID of this detection.
311-313 I3 arcsec wrmove ? R.A. arcsecs of the WGA field shift (G10)
314-316 I3 arcsec wdmove ? Decl arcsecs of the WGA field shift (G10)
318-338 A21 --- FSID ID from the FIRST (VIII/71) or SUMSS (VIII/70)
radio catalogue.
339-343 I5 mJy fsrate ? Flux of the FIRST or SUMSS source (G9)
345-346 I2 arcsec fsdist ? Distance from FIRST/SUMSS detection to optical
348-350 I3 deg fstheta ? Angle (N thru E) from optical obj to detection
351-353 I3 % fsconf ? Confidence that this is a true
association (G7)
355-375 A21 --- NVSSID ID from the NVSS radio catalogue (VIII/65)
376-380 I5 mJy nrate ? Flux of the NVSS source (G9)
382-383 I2 arcsec ndist ? Distance from NVSS detection to optical object
385-387 I3 deg ntheta ? Angle (N thru E) from optical obj to detection
388-390 I3 % nconf ? Confidence that this is a true
association (G7)
392-412 A21 --- Lobe1ID FIRST/NVSS ID of a radio lobe for this object
413-417 I5 mJy lrate1 ? Flux of this lobe source (G9)
419-420 I2 arcsec ldist1 ? Distance from lobe detection to central object
422-424 I3 deg ltheta1 ? Angle (N thru E) from central obj to this lobe
425-427 I3 % lconf1 ? Confidence that this is a true
association (G7)
429-449 A21 --- Lobe2ID FIRST/NVSS ID of radio lobe #2 for this object
450-454 I5 mJy lrate2 ? Flux of this lobe source (G9)
456-457 I2 arcsec ldist2 ? Distance from lobe detection to central object
459-461 I3 deg ltheta2 ? Angle (N thru E) from central obj to this lobe
462-464 I3 % lconf2 ? Confidence that this is a true
association (G7)
466-467 A2 --- cat Source catalogue of name identification (G11)
469-470 A2 --- zcat Source catalogue of redshift value (G11)
472-474 I3 K denscat Sky density bin of this sky location (x1000)
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Byte-by-byte Description of file: freelunc.dat knownobj.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension J2000 (hours) (G1)
3- 4 I2 min RAm Right Ascension J2000 (minutes)
5- 8 F4.1 s RAs Right Ascension J2000 (seconds)
9 A1 --- DE- Declination J2000 (sign)
10- 11 I2 deg DEd Declination J2000 (degrees) (G1)
12- 13 I2 arcmin DEm Declination J2000 (minutes)
14- 15 I2 arcsec DEs Declination J2000 (seconds)
17- 19 A3 --- Obj Nature of object and any association (G2)
20 A1 --- --- [(]
21- 24 F4.1 mag Rmag ?=0. Red optical magnitude (G3)
25 A1 --- --- [()]
26- 29 F4.1 mag Bmag ?=0. Blue optical magnitude (G3)
30 A1 --- --- [)]
31- 33 A3 --- Comm Comment on optical object (G4)
34 A1 --- Rpsf Red optical PSF class (G5)
36 A1 --- Bpsf Blue optical PSF class (G5)
38- 58 A21 --- Name ID from the literature
59- 61 I3 % QSOpct ? Confidence that the radio/X-ray association
shows this object to be a quasar (G6)
62- 64 I3 % galpct ? Confidence (as above) that obj is galaxy (G6)
65- 67 I3 % starpct ? Confidence (as above) that obj is a star (G6)
68- 70 I3 % errpct ? Probability that this is a false association,
i.e., coincidental radio/X-ray & optical (G7)
71- 76 F6.3 --- z ? Redshift from the literature.
78- 98 A21 --- ID1 #1 radio / X-ray ID (G8)
99-103 I5 mJy/ct/h rate1 ? Flux / count rate of the #1 source (G9)
105-125 A21 --- ID2 #2 radio / X-ray ID (G8)
126-130 I5 ct/h rate2 ? Count rate per hour of the #2 source (G9)
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Byte-by-byte Description of fle: qsocand.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension J2000 (hours) (G1)
3- 4 I2 min RAm Right Ascension J2000 (minutes)
5- 8 F4.1 s RAs Right Ascension J2000 (seconds)
9 A1 --- DE- Declination J2000 (sign)
10- 11 I2 deg DEd Declination J2000 (degrees) (G1)
12- 13 I2 arcmin DEm Declination J2000 (minutes)
14- 15 I2 arcsec DEs Declination J2000 (seconds)
17- 19 A3 --- Obj R=radio association, X=X-ray association (G2)
20 A1 --- n_Rmag [(]
21- 24 F4.1 mag Rmag ?=0. Red optical magnitude (G3)
25 A1 --- --- [()]
26- 29 F4.1 mag Bmag ?=0. Blue optical magnitude (G3)
30 A1 --- --- [)]
31- 33 A3 --- Comm Comment on optical object (G4)
34 A1 --- Rpsf Red optical PSF class (G5)
36 A1 --- Bpsf Blue optical PSF class (G5)
38- 40 I3 % QSOpct Confidence that the radio/X-ray association
shows this object to be a quasar (G6)
41- 43 I3 % galpct Confidence (as above) that obj is galaxy (G6)
44- 46 I3 % starpct Confidence (as above) that obj is a star (G6)
47- 49 I3 % errpct Probability that this is a false association,
i.e., coincidental radio/xray & optical (G7)
51- 71 A21 --- ID1 #1 radio / X-ray ID (G8)
72- 76 I5 mJy/ct/h rate1 Flux / count rate of the #1 source (G9)
78- 98 A21 --- ID2 #2 radio / X-ray ID (G8)
99-103 I5 ct/h rate2 ? Count rate per hour of the #2 source (G9)
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Global notes:
Note (G1): The location is given as per the IAU recommended naming
convention, thus the location doubles as the name for each object.
When referring to a candidate from one of these quasars.org
catalogues, specify it as e.g., QORG J000108.1-373858.
Note (G2): Summarizes the identification (from the literature) and
radio/xray associations presented for this optical object.
Legend:
Q=QSO, G=galaxy, A=AGN, B=Bl Lac, S=star, U=unknown with redshift,
R=radio source, 2=Double-Lobed radio source, X=x-ray source
Note (G3): Magnitudes have been recalibrated from the original APM/USNO-A
values. Estimated accuracy of these values is 0.2 from true, B-R
to 0.1. However, USNO-A non-POSSI objects fainter than 18.5 can
have larger errors. Extended objects brighter than mag 13 can be
represented as far too bright. If image is absent in this color,
the plate depth is shown in parentheses.
Note (G4): Legend:
p = optical magnitudes are POSSI E and O.
(no p)= Not POSSI, so the magnitudes are UKST R and Bj.
v = variability over 1 magnitude detected across epochs for both red & blue
m = proper motion detected across epochs (nominally over 3 arcseconds).
? = inferred object, position and optical magnitudes are estimated only
for each colour where the PSF is marked as "n".
Note (G5): The APM provides PSF class, the USNO does not. Legend:
- = stellar PSF (from APM)
1 = fuzzy PSF (from APM)
2 = extended PSF. Can be galaxies, merged stars, etc.
n = no PSF available, usually USNO-sourced.
x = no image resolved (image fainter than plate depth, or confused, etc.)
Note (G6): Probability that object is a QSO/galaxy/star is evaluated
from the radio/X-ray association with catalogued QSOs/galaxies/stars.
There are four cross-categories, these being the PSF (stellar
appearance) of the optical object, its B-R color, the offset of the
optical and radio/X-ray positions, and the ratio of the radio/X-ray
flux to the optical flux (via magnitude), and the radio detections are
pooled separately from the X-ray detections. Candidates are compared
by these qualities to known objects, and the I.D. probabilities are
set by numerical prevalence of the known objects. These same
probabilities are also listed for the known objects, so that you may
judge for yourself the effectiveness of this method in correctly
determining the nature of the optical object. Note that the
probability of incorrect association (of the optical object to the
radio/X-ray detection) is listed in the fourth percentile column, and
that the four columns add to 100%. Thus the probability of incorrect
association is already built into the listed probabilities that the
object is a radio/X-ray QSO, galaxy, or star.
In this catalogue, a quasar is taken as any broad emission-line
object, so includes Seyfert-1 galaxies and many/most Bl Lacs. However,
known objects display object categories as defined in the Veron catalogue.
Note (G7): Confidence of association is based on whole-sky density of
optical objects of the listed PSF and B-R colors. Density of such
objects at x arcseconds from the radio detections is compared with
whole-sky density, same for X-ray. Ten times the density yields a
confidence of 90%, etc. Whole-sky object densities are sub-categorized
by galactic density subclasses to minimize local-sky bias to within
20% in most cases.
Also, see note (G6) above.
Note (G8): A radio detection is provided if available, same for an X-ray
detection. If both radio and X-ray detections are listed, the radio is
given first. Two radio detections displayed indicate that the second
is a lobe. See note (G2), above, for an E-Z guide to what detections
are listed.
Note (G9): If following a radio detection (i.e. from FIRST, NVSS or SUMSS),
then this figure is the peak flux in mJy. If the first detection is an
X-ray detection, then this figure is the countrate in counts/hour.
Values are from their respective source catalogues. Values over 99999
are displayed as 99999.
Note (G10): Radio and X-ray surveys are comprised of a set of single
observations each of which cover a defined swath (field) of sky, but
with some uncertainty as to the precise location. The ground-based
FIRST, NVSS and SUMSS radio surveys have very little uncertainty, but
the ROSAT-satellite-based HRI, RASS, PSPC and WGA surveys typically
have positional uncertainty up to 15 arcseconds for the HRI and 5-25
arcseconds for the others. A "best fit" between the detections and the
optical background is used to precisely fix the astrometry of each
field. This catalogue achieves that by weighing the individual objects
in the optical background (see #7 above) and using likelihood
algorithms to determine the best candidates, using the
670,925,779-object HGU optical catalogue as the control.
The correctness of the technique is seen with any number of spot
checks such as the HRI NGC3628 field US700009H.N1 which has been
shifted RA +5.8 arcsec (positive is eastwards) and decl -14 arcsec
(negative is southwards) to become well-aligned with 5 known quasars
in the field.
Note (G11): Source catalogues for names and redshifts are as follows:
2G: 2dFGRS, 2dF Galaxy Redshift Survey
Colless, M., et al. 2001, Cat. VII/226
2Q: 2dF QSO Redshift Survey (2QZ)
Croom S.M., et al. 2001, Cat. VII/223
3C: 3CRR ,online 3CRR catalogue at http://www.3crr.dyndns.org
Laing R.A., Riley J.M., Longair M.S., 1983MNRAS.204..151L 1983MNRAS.204..151L
6D: 6dF Galaxy Redshift Survey Early Data Release
Wakamatsu et al. 2002, IAU Regional Assembly, ASP Conf. Proc., in press
6Q: 6dF QSO Redshift Survey (6QZ), Croom S.M. et al. 2003, MNRAS, submitted
CF: CfA Redshift Catalogue, Huchra J. P., et al. 1996, Cat VII/193
CN: Common Name Cross Index, Smith, W.B., 1996 unpublished, Cat. <IV/22 >
CV: Atlas of Cataclysmic Variables, Downes, R. A., et al. 2001, Cat. V/110
EN: ENEAR, Redshift-Distance Survey of Nearby Early-Type Galaxies
Wegner, G., et al., 0308357, submitted to AJ.
GC: General Catalogue of Variable Stars (Vol 1) with Improved Coordinates
Samus, N.N., et al. 2002, Cat. J/other/PAZh/28/201
HD: Henry Draper Extension Charts, Nesterov V.V. et al. 1995, Cat. III/182
LB: Large Bright Quasar Survey
Hewett P.C., Foltz C.B., Chaffee F.H. 1995, Cat. J/AJ/109/1498
LC: Las Campanas Redshift Survey, Shectman et al. 1996, Cat. VII/203
NE: NASA/IPAC Extragalactic Database (NED)
NL: revised New Luyten Two-Tenths catalogue of high proper-motion stars
Salim, S., Gould, A. 2003, Cat. J/ApJ/582/1011
PG: Principal Galaxy Catalogue, Lyon-Meudon Extragalactic Database (LEDA)
Paturel, G., Bottinelli, L., Gouguenheim, L. , See Cat. VII/237
PS: IRAS PSCz Redshift Survey, Saunders, W., et al. 2000, Cat. VII/221
SD: SDSS, the Sloan Digital Sky Survey (SDSS Data Release 1)
Abazajian, K., et al. 2003, AJ, submitted; 0305492
TY: Tycho, Hog et al. 2000, Cat. I/259
UG: Catalogue of Arcsecond Positions of UGC Galaxies
Cotton W.D., Condon J.J. 1999, Cat. J/ApJS/125/409
VE: Catalogue of Quasars and Active Nuclei, 11th edition,
Veron-Cetty, M.-P., Veron, P. 2003, Cat. VII/235
WD: Spectroscopically Identified White Dwarfs
McCook G.P., Sion E.M. 1999, Cat. III/235
YL: Yale, the Bright Star Catalogue, 5th Revised Ed.
Hoffleit E.D., Warren Jr. W.H., 1991, Cat. V/50
ZW: Updated Zwicky Catalog, Falco E.E., et al 1999, Cat. J/PASP/111/438
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Acknowledgements: Eric Flesch
If using this catalogue in published research, please add a small
acknowledgement.
(End) Patricia Vannier [CDS] 22-Jul-2004