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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 89 185 List of the 185 galaxy candidates table3.dat 90 76 List of the 76 known AGN brighter than O(USNO)=16.5, located within 35" of a ROSAT-FSC source table4.dat 90 103 List of 103 QSO candidates identified with a ROSAT-FSC source and located in zone IVa.
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
Bytes Format Units Label Explanations
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
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
Byte-by-byte Description of file: table3.dat table4.dat
Bytes Format Units Label Explanations
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
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.
History: From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 13-Feb-2004
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