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J/A+A/307/33 X-ray quasar spectra (Schartel+ 1996)
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Redshift dependence of soft X-ray quasar spectra
Schartel N., Walter R., Fink H.H., Truemper J.
<Astron. Astrophys. 307, 33 (1996)>
=1996A&A...307...33S (SIMBAD/NED BibCode)
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ADC_Keywords: QSOs ; X-ray sources
Keywords: X-rays: galaxies - quasars: general
Mission_Name: ROSAT
Description:
The analysis of the X-ray spectra of a sample of 102 X-ray bright
quasars observed with ROSAT during the all-sky survey confirmed for
the soft (0.1-2.4)keV energy range that the power law photon indices
of radio-loud and radio-quiet quasars differ significantly from each
other: <{GAMMA}>_rl_=2.23+/-0.07; <{GAMMA}>_rq_=2.54+/-0.04. These
mean indices are found to be significantly steeper than those
determined for the harder (0.3-3.5)keV energy band of the Einstein
Observatory/IPC and the medium energy (2-10...20)keV bands of the
EXOSAT/ME and Ginga/LAC experiments for identical subsets of quasars.
The comparison yielded a tendency of the harder the energy range
covered by the experiment the flatter the average spectral indices.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 69 102 The sample, ordered by redshift and grouped to
redshift bins
table2 62 102 Spectral characteristics
table3 104 102 Best fit parameters
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See also:
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1996)
Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 3 I3 --- No Sequential number
4 A1 --- Type [ql] q: Radio-quiet quasar
l: radio-loud quasar
6- 17 A12 --- QSO Quasar name
19- 20 I2 h RAh Right ascension (1950)
22- 23 I2 min RAm Right ascension (1950)
25- 28 F4.1 s RAs Right ascension (1950)
30 A1 --- DE- Declination sign
31- 32 I2 deg DEd Declination (1950)
34- 35 I2 arcmin DEm Declination (1950)
37- 38 I2 arcsec DEs Declination (1950)
40- 44 F5.3 --- z Redshift
46- 50 F5.2 mag Vmag V magnitude
52- 56 F5.1 mag MVmag Absolute V magnitude
58- 62 F5.2 10-7W log(nuLnu) Optical luminosity (1)
64- 69 F6.3 --- alphaRO ? Radio to optical fluxes ratio
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Note (1): The optical luminosity was calculated using the calibration
log({nu}L_{nu})=-0.4M_V_ + 35.357 +0.4F_{nu}_E(B-V)
for {nu}=5.45x10^14^Hz or lambda=5500A
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 3 I3 --- No Sequential number
4 A1 --- Type [ql] q: radio-quiet quasar, l: radio-loud quasar
6- 17 A12 --- QSO Quasar name
19- 23 I5 s Exp Exposure
25- 28 F4.2 ct/s Count Count rate
30- 33 F4.2 ct/s e_Count rms uncertainty on Count
35- 38 F4.2 --- HR1 Hardness ratio 1 (1)
40- 43 F4.2 --- e_HR1 rms uncertainty on HR1
45- 49 F5.2 --- HR2 Hardness ratio 2 (1)
51- 54 F4.2 --- e_HR2 rms uncertainty on HR2
56- 58 I3 --- b b parameter (1)
60- 62 I3 --- c c parameter (1)
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Note (1): HR1=(B-A)/(A+B) and HR2=(D-C)/(D+C)
where A = count rate in PHA range 11-41 (~0.1-0.4keV)
B = count rate in PHA range 52-201 (~0.5-2.0keV)
C = count rate in PHA range 52-90 (~0.5-0.9keV)
D = count rate in PHA range 91-201 (~0.9-2.0keV)
(PHA = Pulse Height Amplitude)
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 3 I3 --- No Sequence number
4 A1 --- Type [ql] q: radio-quiet quasar
l: radio-loud quasar
6- 17 A12 --- QSO Quasar name
19- 23 F5.1 10+20cm-2 N(H) Hydrogen column density
25- 29 F5.1 10+20cm-2 E_N(H) Error in N(H) (upper limit)
31- 35 F5.1 10+20cm-2 e_N(H) Error in N(H) (lower limit)
37- 40 F4.2 --- Gamma Photon index
42- 46 F5.2 --- E_Gamma Error in Gamma (upper limit)
48- 51 F4.2 --- e_Gamma Error in Gamma (lower limit)
53- 57 F5.2 10+20cm-2 N(H)Gal Galactic hydrogen column density
58 A1 --- n_N(H)Gal [a] a: from Elvis et al. (1989)
60- 63 F4.2 --- GammaGal Galactic photon index
65- 68 F4.2 --- E_GammaGal Error in GammaGal (upper limit)
70- 73 F4.2 --- e_GammaGal Error in GammaGal (lower limit)
75- 79 F5.2 10-11mW/m2 F1-24 ROSAT band (0.1-2.4)keV flux
81- 84 F4.2 10-11mW/m2 e_F1-24 rms uncertainty on F1-24
86- 90 F5.3 10-11mW/m2 log(nuFnu) Spectral flux density at 2 keV
92- 96 F5.3 10-11mW/m2 e_log(nuFnu) rms uncertainty on nuFnu
98-102 F5.2 10-7W log(nuLnu) Luminosity at 2 keV
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Courtesy: Roland WALTER <Roland.Walter@obs.unige.ch>
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(End) Patricia Bauer [CDS] 11-Sep-1996