J/ApJ/518/656 ASCA Large Sky Survey (Ueda+, 1999)
logN-logS relations and spectral properties of sources from the ASCA Large Sky
Survey: their implications for the origin of the cosmic X-ray background (CXB)
Ueda Y., Takahashi T., Inoue H., Tsuru T., Sakano M., Ishisaki Y.,
Ogasaka Y., Makishima K., Yamada T., Akiyama M., Ohta K.
<Astrophys. J. 518, 656 (1999)>
=1999ApJ...518..656U 1999ApJ...518..656U (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; X-ray sources
Mission_Name: ASCA
Keywords: diffuse radiation - galaxies: active - galaxies: statistics -
X-rays: galaxies
Abstract:
We carried out the first wide-area unbiased survey with the ASCA
satellite in the 0.7-10keV band around a north Galactic-pole region
covering a continuous area of 7deg2 (Large Sky Survey; LSS). To make
the best use of ASCA's capabilities, we developed a new
source-detection method in which the complicated detector responses
are fully taken into account. Applying this method to the entire LSS
data independently in the total (0.7-7keV), hard (2-10keV), and soft
(0.7-2keV) bands, we detected 107 sources altogether, with sensitivity
limits of 6x10-14 (0.7-7keV), 1x10-13 (2-10keV), and
2x10-14ergs/s/cm2 (0.7-2keV), respectively. A complete list of the
detected sources is presented.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 105 107 The source list in the LSS field
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- AX Source name (AX JHHMM.m+DDMM)
16 A1 --- n_AX [e] Note (5)
18- 25 F8.4 deg RAdeg Right ascension (J2000) (1)
27- 33 F7.4 deg DEdeg Declination (J2000) (1)
35- 38 F4.1 --- GISStot GIS (Gas Imaging Spectrometer)
total (0.7-7keV) band significance
39 A1 --- --- [/]
40- 43 F4.1 --- SISStot ? SIS (Solid-state Imaging Spectrometer)
total (0.7-7keV) band significance (2)
45- 48 F4.1 --- GISShard GIS hard (2-10KeV) band significance
49 A1 --- --- [/]
50- 53 F4.1 --- SISShard ? SIS hard (2-10KeV) band significance (2)
55- 58 F4.1 --- GISSsoft GIS soft (0.7-2keV) band significance
59 A1 --- --- [/]
60- 63 F4.1 ---- SISSsoft ? SIS soft (0.7-2keV) band significance (2)
65- 68 F4.1 ct/ks GISCRtot GIS total (0.7-7keV) band count-rate (3)
69 A1 --- --- [/]
70- 73 F4.1 ct/ks SISCRtot ? SIS total (0.7-7keV) band count-rate (2) (3)
75- 78 F4.1 ct/ks GISCRhard GIS hard (2-10KeV) band count-rate
79 A1 --- --- [/]
80- 83 F4.1 ct/ks SISCRhard ? SIS hard (2-10KeV) band count-rate (2) (3)
85- 88 F4.1 ct/ks GISCDsoft GIS soft (0.7-2keV) band count-rate (3)
89 A1 --- --- [/]
90- 93 F4.1 ct/ks SISCDsoft ? SIS soft (0.7-2keV) band count-rate (2) (3)
95- 99 F5.2 --- GAMMA Spectrum photon index (4)
101-104 F4.2 --- e_GAMMA rms uncertainty on GAMMA
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Note (1): Typical position uncertainty is about 0.7' in radius.
Note (2): Band significances are expressed in σ.
No value means out of FOV (only for the SIS).
Note (3): Vignetting-corrected count rate at the reference position in the XRT
coordinate (8.5'offset for the GIS and 7.0' offset for the SIS)
integrated within a radius of 6' (GIS) and 4' (SIS).
Note (4): The best-fit photon index obtained by the simultaneous fitting of the
GIS and the SIS spectra in the 0.7-10keV range, assuming a power law
with the Galactic absorption (1.1x1020cm-2). Error is a
1σ statistical error for a single parameter.
Note (5): Corresponds to the LSS hardest source. The position is taken from
results of deep X-ray observations by Sakano et al. 1998.
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History: From ApJ electronic version
(End) James Marcout, Patricia Bauer [CDS] 14-Sep-1999