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J/A+A/330/108 ROSAT detected quasars. II. (Yuan+ 1998)
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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)
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ADC_Keywords: QSOs ; X-ray sources
Keywords: galaxies: active - quasars - X-rays: galaxies
Mission_Name: ROSAT
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-{sigma} error is smaller
than 0.5, otherwise we used the redshift-dependent mean value (see the
paper for details).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 133 846 ROSAT detected radio-quiet quasars
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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
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Bytes Format Units Label Explanations
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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
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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 {sigma} 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 {sigma} 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>
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Acknowledgements: Weimin Yuan <wey@rzg.mpg.de>
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(End) Patricia Bauer [CDS] 16-Dec-1997