J/ApJ/434/54 Spectral properties of X-ray-selected AGNs (Thompson+ 1994)
A statistical analysis of the broadband 0.1 to 3.5keV spectral properties of
X-ray-selected active galactic nuclei.
Thompson R.J., Cordova F.A.
<Astrophys. J. 434, 54 (1994)>
=1994ApJ...434...54T 1994ApJ...434...54T (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; X-ray sources
Keywords: galaxies: active - X-rays: galaxies
Abstract:
We survey the broadband spectral properties of ∼500 X-ray-selected
active galactic nuclei (AGNs) observed with the Einstein Observatory.
Included in this survey are the ∼450 AGNs in the Extended Medium
Sensitivity Survey of Gioia et al. (1990ApJS...72..567G 1990ApJS...72..567G) and the ∼50
AGNs in the Ultrasoft Survey of Cordova et al. (1992ApJS...81..661C 1992ApJS...81..661C).
We present a revised version of the latter sample, based on the post
publication discovery of a software error in the Einstein Rev-1b
processing. We find that the mean spectral index of the AGNs between
0.1 and 0.6keV is softer, and the distribution of indices wider, than
previous estimates based on analyses of the X-ray spectra of optically
selected AGNs. A subset of these AGNs exhibit flux variability, some
on timescales as short as 0.05-days. A correlation between radio and
hard X-ray luminosity is confirmed, but the data do not support a
correlation between the radio and soft X-ray luminosities, or between
radio loudness and soft X-ray spectral slope. Evidence for physically
distinct soft and hard X-ray components is found, along with the
possibility of a bias in previous optically selected samples toward
selection of AGNs with flatter X-ray spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1a 92 67 Revised Ultrasoft Survey (RUSS) Sources
table1b 91 67 RUSS X-Ray data
table1c 56 67 RUSS X-ray luminosities
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Byte-by-byte Description of file: table1a
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Source name
14 A1 --- n_Seq [*] Note (1)
15- 18 I4 --- Seq IPC sequence
20- 21 I2 --- SRC Source number
23- 24 I2 h RAXh X-ray right ascension (1950)
26- 27 I2 min RAXm X-ray right ascension (1950)
29- 32 F4.1 s RAXs X-ray right ascension (1950)
34 A1 --- DEX- X-ray declination sign
35- 36 I2 deg DEXd X-ray declination (1950)
38- 39 I2 arcmin DEXm X-ray declination (1950)
41- 44 F4.1 arcsec DEXs X-ray declination (1950)
46- 47 I2 h RAh Optical right ascension (1950)
49- 50 I2 min RAm Optical right ascension (1950)
52- 55 F4.1 s RAs Optical right ascension (1950)
57 A1 --- DE- Optical declination sign
58- 59 I2 deg DEd Optical declination (1950)
61- 62 I2 arcmin DEm Optical declination (1950)
64- 65 I2 arcsec DEs Optical declination (1950)
67- 70 F4.2 --- z Redshift
72- 76 F5.2 mag Vmag V magnitude
78- 81 F4.2 10+20cm-2 NH Hydrogen column density
83- 86 I4 --- RECO IPC RECO value (2)
88- 92 F5.2 arcmin Dits Off-axis distance
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Note (1): *: source that satisfy our criteria for being "truly" soft, i.e.
being free from shadowing by the detector support ribs and having
good counting statistics (R1 +1σ<0.6)
Note (2): Measure of the amount of shadowing by the detector support ribs,
Harnden et al., 1984, Smithsonian Astrophys. Obs. Spec. Rep. No. 393
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Byte-by-byte Description of file: table1b
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Source name, as in table1a
14- 19 F6.3 --- R1 Counts in colour ratio R1
21- 25 F5.3 --- e_R1 rms uncertainty on R1
27- 34 F8.3 --- R2 Counts in colour ratio R2 (C3/C2)
36- 48 E13.3 --- e_R2 rms uncertainty on R2
49- 55 F7.3 --- C1 Counts ratio at the energy band C1=0.16-0.56keV
57- 62 F6.3 --- e_C1 rms uncertainty on C1
64- 70 F7.3 --- C2 Counts ratio at the energy band C2=0.56-1.08keV
72- 77 F6.3 --- e_C2 rms uncertainty on C2
79- 84 F6.3 --- C3 Counts ratio at the energy band C3=1.08-3.5keV
86- 91 F6.3 --- e_C3 rms uncertainty on C3
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Byte-by-byte Description of file: table1c
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Source name, as in table1a
14- 18 F5.3 ct/s IPC IPC counts
20- 24 F5.3 ct/s e_IPC rms uncertainty on IPC
26- 30 F5.2 solLum L1s ? Soft-component luminosity for the 10eV
rest-frame model
32- 36 F5.2 solLum L2s ? Soft-component luminosity for the 7.85eV
observed-frame model
38 A1 --- l_Lh Limit flag on Lh
39- 43 F5.2 solLum Lh Hard-component luminosity from the
observer-frame model
45- 49 F5.2 solLum L0.2keV ? Monochromatic 0.2keV luminosity
51 A1 --- l_L2.0keV Limit flag on L2.0keV
52- 56 F5.2 solLum L2.0keV Monochromatic 2.0keV luminosity
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 06-Jun-1997