Access to Astronomical Catalogues

← Click to display the menu
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 (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) and the ∼50 AGNs in the Ultrasoft Survey of Cordova et al. (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:
FileName Lrecl Records Explanations
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
Byte-by-byte Description of file: table1a
Bytes Format Units Label Explanations
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
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
Byte-by-byte Description of file: table1b
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: table1c
Bytes Format Units Label Explanations
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
History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 06-Jun-1997
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact