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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 108 68 HELAS sources detected by ROSAT
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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)
http://argos.mporzio.astro.it/hellas/ :
The High Energy LLarge Area Survey (HELLAS) Home Page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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 1990ARA&A..28..215D)
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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.
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History:
From electronic version of the journal
References:
Fiore et al.. Paper I 1999MNRAS.306L..55F 1999MNRAS.306L..55F
Fiore et al.. Paper II 2001MNRAS.327..771F 2001MNRAS.327..771F, Cat. J/MNRAS/327/771
Comastri et al., Paper III 2001MNRAS.327..781C 2001MNRAS.327..781C
La Franca et al., Paper V 2002ApJ...570..100L 2002ApJ...570..100L, Cat. J/ApJ/570/100
(End) James Marcout, Patricia Bauer [CDS] 28-Jan-2002