J/A+A/414/487 Optically bright AGN in ROSAT-FSC (Veron-Cetty+, 2004)
Optically bright active galactic nuclei in the ROSAT-Faint Source Catalogue.
Veron-Cetty M.-P., Balayan S.K., Mickaelian A.M., Mujica R., Chavushyan V.,
Hakopian S.A., Engels D., Veron P., Zickgraf F.-J., Voges W., Xu D.-W.
<Astron. Astrophys., 414, 487-496 (2004)>
=2004A&A...414..487V 2004A&A...414..487V
ADC_Keywords: QSOs ; Active gal. nuclei ; X-ray sources ; Photometry ; Redshifts
Keywords: quasars: general - X-rays: galaxies - galaxies: Seyfert
Abstract:
To build a large, optically bright, X-ray selected AGN sample we have
correlated the ROSAT-FSC (IX/29) catalogue of X-ray sources with the
USNO (I/252) catalogue limited to objects brighter than O=16.5 and
then with the APS (VII/214) database. Each of the 3212 coincidences
was classified using the slitless Hamburg spectra. 493 objects were
found to be extended and 2719 starlike. Using both the extended
objects and the galaxies known from published catalogues we built up a
sample of 185 galaxies with O(APS)<17.0mag, which are high-probability
counterparts of RASS-FSC X-ray sources. 130 galaxies have a redshift
from the literature and for another 34 we obtained new spectra. The
fraction of Seyfert galaxies in this sample is 20%. To select a
corresponding sample of 144 high-probability counterparts among the
starlike sources we searched for very blue objects in an APS-based
color-magnitude diagram. Forty-one were already known AGN and for
another 91 objects we obtained new spectra, yielding 42 new AGN,
increasing their number in the sample to 83. This confirms that
surveys of bright QSOs are still significantly incomplete. On the
other hand we find that, at a flux limit of 0.02ct/s and at this
magnitude, only 40% of all QSOs are detected by ROSAT.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 85 185 List of the 185 galaxy candidates
table3.dat 85 76 List of the 76 known AGN brighter than O(USNO)=16.5,
located within 35" of a ROSAT-FSC source
table4.dat 84 103 List of 103 QSO candidates identified with a
ROSAT-FSC source and located in zone IVa.
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See also:
IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)
I/252 : The USNO-A2.0 Catalogue (Monet+ 1998)
VII/214 : APS Galaxies in the North Galactic Pole (Cabanela, 1999)
J/A+AS/115/235 : The Hamburg/ESO survey for bright QSOs. II. (Reimers+, 1996)
J/A+A/358/77 : Hamburg/ESO survey for bright QSOs. III. (Wisotzki+, 2000)
J/A+AS/128/507 : The Hamburg Quasar Survey. II. (Engels+ 1998)
J/A+AS/134/483 : The Hamburg Quasar Survey. III. (Hagen+ 1999)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Optical right ascension (J2000)
4- 5 I2 min RAm Optical right ascension (J2000)
7- 11 F5.2 s RAs Optical right ascension (J2000)
13 A1 --- DE- Optical declination sign (J2000)
14- 15 I2 deg DEd Optical declination (J2000)
17- 18 I2 arcmin DEm Optical declination (J2000)
20- 23 F4.1 arcsec DEs Optical declination (J2000)
25- 28 F4.1 arcsec Sep Separation between the ROSAT and USNO positions
30- 34 F5.3 ct/s Xcr X-ray count rate
36- 40 F5.2 [10-7W] logLX ? 0.1-2.4keV X-ray luminosity
42- 45 F4.1 mag O(USNO) ? USNO O magnitude
47- 51 F5.2 mag O(APS) ? APS O magnitude
53- 57 F5.3 --- z ? Redshift
59- 63 A5 --- Class Classificiation (1)
65- 67 A3 --- Obs [1,2 ] Observations code (2)
70- 89 A20 --- Name Name
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Note (1): Notes on the classification:
abs = galaxies with absorption lines only
em = emission line galaxies, but too weak to make a classification
possible
C = stands for Composite spectrum
S or S? = the object is certainly an AGN, but the lines are too weak for
a more precise classification
Note (2): Observations as follows:
1 = Byurakan Astrophysical Observatory (BAO) observations, made on
3-10 March, 2002, with the 2.6-m telescope using the
SCORPIO spectral camera
2 = Observatoire de Haute Provence (OHP) observations, made on
15-19 April 2002, with The 1.93-m telescope and the
spectrograph CARELEC
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Byte-by-byte Description of file: table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh USNO right ascension (J2000)
4- 5 I2 min RAm USNO right ascension (J2000)
7- 11 F5.2 s RAs USNO right ascension (J2000)
13 A1 --- DE- USNO declination sign (J2000)
14- 15 I2 deg DEd USNO declination (J2000)
17- 18 I2 arcmin DEm USNO declination (J2000)
20- 23 F4.1 arcsec DEs USNO declination (J2000)
25- 28 F4.1 arcsec Sep Separation between the ROSAT and USNO positions
30- 34 F5.3 ct/s Xcr X-ray count rate
36- 39 F4.1 mag O(USNO) ? USNO O magnitude
41- 45 F5.2 mag O(APS) ? APS O magnitude
47- 51 F5.2 mag O-E ? APS O-E colour index
53- 57 F5.3 --- z ? Redshift
59- 63 F5.1 mag OMAG ? Absolute magnitude, computed by using the
O(USNO) magnitude (H0=50km/s/Mpc)
65- 67 A3 --- Type Classificiation (1)
69 I1 --- Obs [1/2]? Observations code, in table4.dat only (2)
71- 90 A20 --- Name Name
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Note (1): Classification as follows:
Bl = BL Lac object
Q = QSO
S1 = Seyfert 1 galaxy
S1n = Narrow Line Seyfert 1
DA, DN, WD = white dwarfs
* = stars
CV = cataclysmic variable
Note (2): Observations as follows:
1 = Guillermo Haro Astrophysical Observatory (OAGH) observations,
carried out during three observing runs (May and August 2002 and
May 2003) with the 2.1-m telescope
2 = Observatoire de Haute Provence (OHP) observations, made on
September 2003 with the OHP 1.93-m telescope.
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 13-Feb-2004