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Detailed Description of J/ApJS/134/77 :
ASCA Galactic Plane Survey faint X-ray sources (Sugizak+, 2001)
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Note : this is the description file of the original catalog.
This HTML page corresponds well to the original description, but some minor
changes in the format may have been introduced in the FITS output
files in order to allow for arithmetic operations on quantities
such as coordinates and times. h:m:s and d:m:s units are normally
converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the
units; the value given in the HTML files supersedes the value indicated in the ReadMe
file for this catalogue.
J/ApJS/134/77 ASCA Galactic Plane Survey faint X-ray sources (Sugizak+, 2001)
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Faint X-ray sources resolved in the ASCA galactic plane survey and
their contribution to the galactic ridge X-ray emission.
Sugizaki M., Mitsuda K., Kaneda H., Matsuzaki K., Yamauchi S., Koyama K.
<Astrophys. J. Suppl. Ser. 134, 77 (2001)>
=2001ApJS..134...77S
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ADC_Keywords: Galactic plane ; X-ray sources
Mission_Name: ASCA
Keywords: Galaxy: general - X-rays: general
Abstract:
The X-ray emission from the central region of the Galactic plane,
|l|<~45° and |b|<~0.4°, was studied in the 0.710keV energy
band with a spatial resolution of ~3' with the Advanced Satellite for
Cosmology and Astrophysics (ASCA) observatory. We developed a new
analysis method for the ASCA data to resolve discrete sources from the
extended Galactic ridge X-ray emission (GRXE). We successfully
resolved 163 discrete sources with an X-ray flux down to
10-12.5ergs/cm2/s and determined the intensity variations of the
GRXE as a function of the Galactic longitude with a spatial resolution
of about 1°.
File Summary:
FileName Lrecl Records Explanations
× 80 . This file
× ReadMe 80 . This file
× table2.dat 200 163 Source List of the ASCA Galactic Plane Survey
× table5.dat 148 10 Summary of 10 Relatively Bright X-Ray Sources with
F>10-11ergs/cm2/s in the Resolved Sources
See also:
J/ApJ/518/656 : ASCA Large Sky Survey (Ueda+, 1999)
IX/13 : The 2E Catalogue (Harris+ 1994)
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
VII/211 : A Catalogue of Galactic Supernova Remnants (Green 1998)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1 A1 --- n_AXJ [*] Note on ASCA name (1)
2- 16 A15 --- AXJ ASCA Name
18- 24 F7.3 deg GLON [-90/90] Galactic longitude
26- 31 F6.3 deg GLAT Galactic latitude
33- 39 F7.3 deg RAdeg Right ascension (J2000) (2)
41- 47 F7.3 deg DEdeg Declination (J2000) (2)
49- 54 F6.1 ct/ks F1 ? Flux at 0.7-2keV, in ct/ks/GIS (3)
55 A1 --- --- [/]
56- 60 F5.1 --- e_F1 ? Detection significance of F1, see Eq.6
62- 67 F6.1 ct/ks F3 ? Flux at 0.7-7keV, in ct/ks/GIS (3)
68 A1 --- --- [/]
69- 73 F5.1 --- e_F3 ? Detection significance of F3, see Eq.6
75- 80 F6.1 ct/ks F2 ? Flux at 2-10keV, in ct/ks/GIS (3)
81 A1 --- --- [/]
82- 85 F4.1 --- e_F2 ? Detection significance of F2, see Eq.6
87- 91 F5.2 10-15W/m2 Flux ? Flux in 0.7-10 keV (PL parameter) (4)
93- 97 F5.2 --- Gamma ? Photon-law index (PL parameter) (4)
99-102 F4.2 --- e_Gamma ? Error in Gamma (lower limit)
104-107 F4.2 --- E_Gamma ? Error in Gamma (upper limit)
109-113 F5.2 10+22cm-2 NH ? Absorption hydrogen column density
115-119 F5.2 10+22cm-2 e_NH ? Error in NH (lower limit)
121-125 F5.2 10+22cm-2 E_NH ? Error in NH (upper limit)
127-131 F5.2 --- ChiNu2 ? Reduced {chi}{nu}2 for 10 degrees
of freedom (not {chi}{nu} as stated
in the paper)
133-200 A68 --- Id Identification (5)
Note (1): The asterisk on a source name denotes reduced accuracy because
the source location is near the edge of the field of view.
Note (2): Uncertainty of the position coordinates is ~1.0'=0.016°
Ueda et al., 1999, Cat. J/ApJ/518/656
Note (3): Flux obtained from image fitting analysis are shown in
counts/ks/GIS (countrate for a single GIS detector -- ASCA has two
GISs), a count rate observed at the GIS nominal position, for each
energy band. Blanks mean no source candidates in the energy band.
Note (4): Best-fit parameters of a power-law model, photon index Gamma,
absorption column density NH (1022cm-2), flux
(10-12ergs/cm2/s) in 0.7-10keV and reduced {Chi}.{Chi}{nu} for
10 degrees of freedom, are shown for the sources with the significance
above 5{sigma}. All errors represent 90% confidence limits.
Blanks in the errors mean that the best-fit power-law model is
unacceptable within a 97% confidence limit ({Chi}{nu}<2).
Note (5): Identified catalog sources within the position determination
accuracy of 1' in the Einstein IPC X-ray Source Catalog (2E, Cat.
IX/13), the ROSAT All-Sky Survey Bright Source Catalog (1RXS, Cat.
IX/10), the Green Galactic SNR Catalogue (G, Cat. VII/211), and
catalogues of optical stars in SIMBAD database (SIM).
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 15 A15 --- AXJ ASCA name
17- 21 F5.2 --- Gamma Photon index (1)
23- 26 F4.2 --- E_Gamma ? Error in Gamma (upper limit)
28- 31 F4.2 --- e_Gamma ? Error in Gamma (lower limit)
33- 37 F5.2 10+22cm-2 NH Absorption column density
39- 42 F4.2 10+22cm-2 E_NH ? Error in NH (upper limit)
44- 47 F4.2 10+22cm-2 e_NH ? Error in NH (lower limit)
49- 52 F4.1 10-15W/m2 Flux Flux in he 0.7-10keV band
54 A1 --- f_Flux [O] Flux variability with a confidence
above 99%
56-148 A93 --- Id Identification and References
Note (1): Best-fit values of power-law model, extracted from table2.dat
History:
From electronic version of the journal
* 18-Dec-2001: thanks to checks by Stephen A. Drake
(drake@olegacy.gsfc.nasa.gov), explanations of the flux parameters
were corrected, as well as errors on Gamma and NH, and error in the
definition of the ChiNu2 parameter.
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(End) Patricia Bauer [CDS] 08-Jun-2001