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J/A+A/330/108       ROSAT detected quasars. II. (Yuan+ 1998)

Broad band energy distribution of ROSAT detected quasars. II. Radio-quiet objects Yuan W., Brinkmann W., Siebert J., Voges W. <Astron. Astrophys. 330, 108 (1998)> =1998A&A...330..108Y (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; X-ray sources Mission_Name: ROSAT Keywords: galaxies: active - quasars - X-rays: galaxies Description: We have compiled a sample of all radio-quiet quasars or quasars without radio detection from the Veron-Cetty - Veron catalogue (1993, VV93, Cat. VII/166) detected by ROSAT in the ALL-SKY SURVEY (RASS, Voges 1992, in Proc. of the ISY Conference `Space Science', ESA ISY-3, ESA Publications, p.9, See Cat. IX/10), as targets of pointed observations, or as serendipitous sources from pointed observations publicly available from the ROSAT point source catalogue (ROSAT-SRC, Voges et al. 1995, Cat. IX/11). For all sources we used the results of the Standard Analysis Software System (SASS, Voges et al. 1992, in Proc. of the ISY Conference `Space Science', ESA ISY-3, ESA Publications, p.223), employing the most recent processing for the Survey data (RASS-II, Voges et al. 1996, Cat. IX/10). The total number of quasars is 846. 69 of the radio-quiet objects with radio detections have already been presented in a previous paper (Brinkmann, Yuan, & Siebert 1997, Cat. J/A+A/319/413) using the RASS-I results. 17 objects were found to be radio-loud from recent radio surveys and were marked in the table. When available, the power law photon indices and the corresponding absorption column densities (NH) were estimated from the two hardness ratios given by the SASS, both with free fitted NH and for Galactic absorption. The unabsorbed X-ray flux densities in the ROSAT band (0.1-2.4keV) were calculated from the count rates using the energy to counts conversion factor for power law spectra and Galactic absorption. As the photon index we used the value obtained for the individual source if the estimated 1-σ error is smaller than 0.5, otherwise we used the redshift-dependent mean value (see the paper for details). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 133 846 ROSAT detected radio-quiet quasars
See also: VII/188 : Quasars and Active Galactic Nuclei (7th Ed.) (Veron+ 1996) IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1996) IX/11 : ROSAT Source Catalog (Voges+ 1994) J/A+A/319/413 : ROSAT detected quasars. I. (Brinkmann+ 1997) Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
1- 9 A9 --- IAU IAU name of the object 11 A1 --- n_IAU *[ *%?!] A flag for classification 12- 29 A18 --- VV93 Alternative name from VV93 (Cat. VII/166) 31- 32 I2 h RAh Right Ascension J2000 (hours) 34- 35 I2 min RAm Right Ascension J2000 (minutes) 37- 40 F4.1 s RAs Right Ascension J2000 (seconds) 42 A1 --- DE- Declination J2000 (Sign or blank) 43- 44 I2 deg DEd Declination J2000 (degrees) 46- 47 I2 arcmin DEm Declination J2000 (') 49- 50 I2 arcsec DEs Declination J2000 (") 52- 56 F5.3 --- z *? Redshift 58- 62 F5.2 mag Vmag *? Magnitude from VV93 (Cat. <VII/166>) 64- 69 F6.2 10-12mW/m2 FX Unabsorbed X-ray flux density (0.1-2.4keV) 71- 75 F5.2 10-12mW/m2 e_FX *Error of X-ray flux density 77- 80 F4.2 --- Gfree *? X-ray photon index (free fitted NH) 82- 85 F4.2 --- E_Gfree *? Positive error of photon index Gfree 87- 90 F4.2 --- e_Gfree *? Negative error of photon index Gfree 92- 96 F5.1 10+20cm-2 NH ? X-ray absorbing column density 98-101 F4.1 10+20cm-2 E_NH *? Positive error of column density 103-106 F4.1 10+20cm-2 e_NH *? Negative error of column density 108-111 F4.2 --- Ggal *? X-ray photon index (Galactic absorption) 113-116 F4.2 --- E_Ggal *? Positive error of photon index Ggal 118-121 F4.2 --- e_Ggal *? Negative error of photon index Ggal 123-127 F5.2 10+20cm-2 NHgal *? Galactic column density 129-130 A2 --- Com *[S P] Notes on the X-ray detection 132-133 A2 --- Ref *? Reference for the quoted spectral index
Note on n_IAU: *: object selected in other wave bands (X-ray, etc.) than in optical %: object found to be radio-loud in recent radio surveys (PMN, NVSS) ?: identification of the X-ray source is uncertain (see text) !: the X-ray flux might be contaminated by a nearby source Note on z: A '0' as the 3rd decimal is mostly an artifact of the machine readable form of the catalogue. See the printed version of VV93 (Cat. VII/166>) for the appropriate values. Note on Vmag: See the printed version of VV93 (Cat. VII/166>) for the appropriate values. Note on e_FX:: One σ statistical errors from count rates only Note on Gfree: Spectral photon index in the ROSAT energy band for a power law fit (S=C*E**(-Gamma)) with free fitted absorption Note on E_Gfree, e_Gfree, E_NH, e_NH, E_Ggal and e_Ggal: One σ errors. If no error is given, the value of the error is unphysically large. Note on Ggal: Spectral photon index in the ROSAT energy band for a power law fit (S=C*E**(-Gamma)) with fixed Galactic absorption Note on NHgal: Galactic column density from Dickey & Lockman (1990ARA&A..28..215D), see the paper. Note on Com: S: detected in RASS; P: detected in pointed observations Note on Ref: BJ: Bechtold J. et al., 1994AJ....108..374B LA: Laor A. et al., 1997ApJ...477...93L RD: Reimers D. et al., 1995A&A...296L..49R SN: Schartel N. et al., 1996, Cat. J/A+A/307/33 UM: Ulrich M. et al., 1996ApJ...457...77U VC: Vignali C. et al., 1997MmSAI..68..141V WT: Wang T. et al., 1996, Cat. J/A+A/309/81
Acknowledgements: Weimin Yuan
(End) Patricia Bauer [CDS] 16-Dec-1997
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