Access to Astronomical Catalogues

← Click to display the menu
J/A+A/370/900       BeppoSAX HELLAS survey. IV               (Vignali+, 2001)

The BeppoSAX High Energy Large Area Survey. IV. On the soft X-ray properties of the hard X-ray-selected HELLAS sources. Vignali C., Comastri A., Fiore F., La Franca F. <Astron. Astrophys. 370, 900 (2001)> =2001A&A...370..900V
ADC_Keywords: X-ray sources Mission_Name: BeppoSAX Keywords: surveys - galaxies: active - galaxies: nuclei - galaxies: starburst - X-rays: galaxies Abstract: We present a comprehensive study of the soft X-ray properties of the BeppoSAX High-Energy Large Area Survey (HELLAS) sources. A large fraction (about 2/3) of the hard X-ray selected sources is detected by ROSAT. The soft X-ray colors for many of these objects, along with the 0.5-2keV flux upper limits for those undetected in the ROSAT band, do imply the presence of absorption. The comparison with the ROSAT Deep Survey sources indicates that a larger fraction of absorbed objects among the HELLAS sources is present, in agreement with their hard X-ray selection and the predictions of the X-ray background synthesis models. Another striking result is the presence of a soft (additional) X-ray component in a significant fraction of absorbed objects. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 108 68 HELAS sources detected by ROSAT
See also: J/A+A/362/799 : The BeppoSAX 2-10 keV Survey (Giommi+, 2000) J/MNRAS/327/771 : BeppoSAX HELLAS survey. II. (Fiore+, 2001) J/ApJ/570/100 : BeppoSAX HELLAS survey. V. (La Franca+, 2002) J/MNRAS/342/575 : BeppoSAX HELLAS survey. VI. (Ciliegi+, 2003) J/A+A/409/79 : HELLAS2XMM survey. IV. (Fiore+, 2003) : The High Energy LLarge Area Survey (HELLAS) Home Page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 A5 --- HELLAS Source identification 7- 8 I2 h RAh right ascension (J2000) 10- 11 I2 min RAm right ascension (J2000) 13- 16 F4.1 s RAs right ascension (J2000) 18 A1 --- DE- Declination sign (J2000) 19- 20 I2 deg DEd Declination (J2000) 22- 23 I2 arcmin DEm Declination (J2000) 25- 28 F4.1 arcsec DEs Declination (J2000) 30- 35 A6 --- Class Classification (1) 37- 41 F5.2 10-2ct/s CR Count Rate 43- 46 F4.2 10-2ct/s e_CR rms uncertainty on CD 48- 52 F5.2 10-16W/m2 F0-5-2keV Flux at 0.5-2keV 54- 59 F6.3 --- HR1 ? Hardness ratio 1 (2) 61- 65 F5.3 --- e_HR1 ? rms uncertainty on HR1 66 A1 --- n_HR1 [+] +: HRI data 68- 73 F6.3 --- HR2 ? Hardness ratio 2 (2) 75- 79 F5.3 --- e_HR2 ? rms uncertainty on HR2 80 A1 --- n_HR2 [+] +: HRI data 82- 90 A9 --- ROR ROR number 92- 95 F4.1 arcmin Off-axis ? Off-axis angle 96- 97 A2 --- n_Off-axis [++ ] ++: RASS 99-102 F4.1 ks Texp Exposure time 104-108 F5.2 10+20cm-2 NHgal ? Galactic hydrogen column density from Dickey & Lockman (1990ARA&A..28..215D)
Note (1): Class *: star 1: broad-line AGN 3 red: broad-line QSO with a red continuum 1.8-2: narrow-line AGN ELG: emission-line galaxy BL Lac: BL Lac object RLQ: radio-loud quasar RadGal: radio-galaxy Cl.: cluster Note (2): Hardness ratios: HR1=(b-a)/(b+a) and HR2=(d-c)/(d+c) where a=0.1-0.4keV, b=0.5-2keV, c=0.5-0.9keV and d=0.9-2keV channels.
History: From electronic version of the journal References: Fiore et al.. Paper I 1999MNRAS.306L..55F Fiore et al.. Paper II 2001MNRAS.327..771F, Cat. J/MNRAS/327/771 Comastri et al., Paper III 2001MNRAS.327..781C La Franca et al., Paper V 2002ApJ...570..100L, Cat. J/ApJ/570/100
(End) James Marcout, Patricia Bauer [CDS] 28-Jan-2002
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