J/ApJ/582/615 SHEEP survey (Nandra+, 2003)
SHEEP: the search for the high-energy extragalactic population.
Nandra K., Georgantopoulos I., Ptak A., Turner T.J.
<Astrophys. J. 582, 615 (2003)>
=2003ApJ...582..615N 2003ApJ...582..615N
ADC_Keywords: X-ray sources ;
Keywords: galaxies: active - galaxies: nuclei - surveys - X-rays: galaxies
Abstract:
We present the SHEEP survey for serendipitously detected hard X-ray
sources in ASCA GIS images. In a survey area of ∼40deg2, 69 sources
were detected in the 5-10keV band to a limiting flux of
∼10-13ergs/cm2/s. The number counts agree with those obtained by
the similar BeppoSAX High-Energy Large Area Survey (HELLAS), and both
are in close agreement with ASCA and BeppoSAX 2-10keV surveys.
Spectral analysis of the SHEEP sample reveals that the 2-10 and
5-10keV surveys do not sample the same populations, however, as we
find considerably harder spectra, with an average Γ∼1.0,
assuming no absorption.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 105 69 The SHEEP Sample
table2.dat 87 56 ROSAT Observations of SHEEP Sources
table3.dat 81 19 Catalog and Literature Identifications
table5.dat 86 8 Spectral Fits to Sources with S/N > 10
--------------------------------------------------------------------------------
See also:
J/MNRAS/327/771 : BeppoSAX HELLAS survey. II. (Fiore+, 2001)
J/A+A/370/900 : BeppoSAX HELLAS survey. IV (Vignali+, 2001)
J/ApJ/570/100 : BeppoSAX HELLAS survey. V. (La Franca+, 2002)
J/ApJ/518/656 : ASCA Large Sky Survey (Ueda+, 1999)
J/ApJS/133/1 : GIS catalog project : source catalog (Ueda+, 2001)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- SHEEP SHEEP designation(JHHMM.m+DDMM)
14- 15 I2 h RAh ASCA Right ascension (J2000)
17- 18 I2 min RAm ASCA Right ascension (J2000)
20- 23 F4.1 s RAs ASCA Right ascension (J2000)
25 A1 --- DE- ASCA Declination sign (J2000)
26- 27 I2 deg DEd ASCA Declination (J2000)
29- 30 I2 arcmin DEm ASCA Declination (J2000)
32- 33 I2 arcsec DEs ASCA Declination (J2000)
35- 38 F4.1 --- S/N Signal-to-noise ratio (equivalent sigma)
40- 43 F4.1 10-4ct/s Raw Total GIS2+GIS3 counts in the 5-10keV band
divided by total exposure (GIS2+GIS3)
45- 47 F3.1 10-4ct/s e_Raw rms uncertainty on Raw
49- 53 F5.1 10-4ct/s Rate Hard-band (5-10keV) count rate corrected to
on-axis value for a single GIS detector
55- 58 F4.1 10-4ct/s e_Rate rms uncertainty on Rate
60- 64 F5.2 --- HM Medium hardness ratio (HM=H-M/H+M) (1)
66- 69 F4.2 --- E_HM Error on HM (Upper limit)
71- 74 F4.2 --- e_HM Error on HM (Lower limit)
76- 80 F5.2 --- HS Soft hardness ratio (HS=H-S/H+S) (1)
82- 85 F4.2 --- E_HS Error on HS (Upper limit)
87- 90 F4.2 --- e_HS Error on HS (Lower limit)
92- 99 I8 --- Seq Sequence number in which this source
was detected
101-105 F5.1 ks ExpTime Total GIS+GIS3 exposure time for sequence
--------------------------------------------------------------------------------
Note (1): Hardness ratios:
HM = H-M/H+M and HS = H-S/H+S, where
M is the medium energy (2-5kev) band
S is the soft (0.7-2keV) band
H is the hard (5-10keV) band
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- SHEEP SHEEP designation
14- 24 A11 --- Seq ROSAT sequence or catalog
26- 30 F5.2 ks ExpTime ROSAT exposure time
32- 35 F4.1 arcmin theta ? Off-axis angle
37- 52 A16 --- RXJ ROSAT designation
54- 57 F4.2 arcmin Offset ? Offset from ACSA position
59 A1 --- l_Rate Limit flag on Rate
60- 66 F7.5 ct/s Rate PSPC or HRI count rate in the 0.1-2keV band
68- 74 F7.5 ct/s e_Rate ? rms uncertainty on Rate
76- 79 F4.1 10+21cm-2 NH Galactic hydrogen column density
81 A1 --- l_Flux Limit flag on Flux
82- 87 F6.2 10-16W/m2 Flux Flux in the 0.1-2keV band
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- SHEEP SHEEP designation
14- 34 A21 --- Name Other name from NED
36- 37 I2 h RAh NED Right ascension (J2000)
39- 40 I2 min RAm NED Right ascension (J2000)
42- 45 F4.1 s RAs NED Right ascension (J2000)
47 A1 --- DE- NED Declination sign (J2000)
48- 49 I2 deg DEd NED Declination (J2000)
51- 52 I2 arcmin DEm NED Declination (J2000)
54- 55 I2 arcsec DEs NED Declination (J2000)
57- 64 A8 --- Class Classification (1)
66- 70 F5.3 --- z ? Redshfit
72- 74 F3.1 arcmin Offset Offset from ROSAT position
76 A1 --- Radio [YN] Known radio source ?
78 A1 --- IR [YN] Known infrared source ?
80- 81 I2 --- Ref Reference code (2)
--------------------------------------------------------------------------------
Note (1): Classification:
Cl = cluster
G = galaxy
QSO = quasi-stellar object
Sy = Seyfert galaxy
Note (2): References:
(1) Maddox et al., 1990MNRAS.243..692M 1990MNRAS.243..692M
(2) Foltz et al., 1993AJ....105...22F 1993AJ....105...22F
(3) Veron-Cetty & Veron, 1996, Cat. J/A+AS/115/97
(4) Wisotzki et al., 2000, Cat. J/A+A/358/77
(5) Newberg et al., 1999, Cat. J/ApJS/123/377
(6) Cutri et al. 2000 (2MASS second incremental release);
(7) Fiore et al., 1999MNRAS.306L..55F 1999MNRAS.306L..55F
(8) Young & Curie, 1998, Cat. J/A+AS/127/367
(9) Becker et al., 1995ApJ...450..559B 1995ApJ...450..559B
(10) Mason et al., 2000, Cat. J/MNRAS/311/456
(11) Zwicky & Herzog, 1963, Cat. VII/49
(12) Takase & Miyauchi-Isobe, 1985, Cat. VII/150
(13) Boyle, Wiles, & Elvis, 1997MNRAS.285..511B 1997MNRAS.285..511B
(14) Falco et al., 1999, Cat. J/PASP/111/438
(15) Johnston et al., 1995, Cat. J/AJ/110/880
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- SHEEP SHEEP designation
15- 17 F3.1 10+21cm-2 NH Galactic hydrogen column density
19- 21 F3.1 10+21cm-2 E_NH Error on NH (Upper limit)
23- 25 F3.1 10+21cm-2 e_NH Error on NH (Lower limit)
28- 31 F4.2 ---- Sp-Index Spectral index Sp-Index
33- 36 F4.2 ---- E_Sp-Index Error on Sp-Index (Upper limit)
38- 41 F4.2 --- e_Sp-Index Error on Sp-Index (Lower limit)
44- 47 F4.2 10-15W/m2 FX(2-10) Flux in the 2-10keV band
50- 53 F4.2 10-15W/m2 FX(5-10) Flux in the 5-10keV band
56- 60 F5.1 --- Chi2 Chi2 value
61 A1 --- --- [/]
62- 64 I3 --- DOF Degrees of freedom
66- 86 A21 ---- Name Other name
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 26-Mar-2003