ADC/CDS Standard Document for Catalog:/journal_tables/ApJS/134/77/
ADC/CDS Standard Document for Catalog:| 1. Use the ADC Data Viewer Suite to visualize the data. |
|
| 2. Get the data files via anonymous FTP. (See Note.) |
|
J/ApJS/134/77 ASCA Galactic Plane Survey faint X-ray sources (Sugizak+, 2001)
================================================================================
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
================================================================================
ADC_Keywords: Galactic plane ; X-ray sources
Keywords: Galaxy: general - X-rays: general
Mission_Name: ASCA
Abstract:
The X-ray emission from the central region of the Galactic plane,
|l|<~45{deg} and |b|<~0.4{deg}, 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^-12.5^ergs/cm^2^/s and determined the intensity variations of the
GRXE as a function of the Galactic longitude with a spatial resolution
of about 1{deg}.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
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^-11^ergs/cm^2^/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 (2000) (2)
41- 47 F7.3 deg DEdeg Declination (2000) (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{deg}
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 N_H_ (10^22^cm^-2^), flux
(10^-12^ergs/cm^2^/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.
================================================================================
(End) Patricia Bauer [CDS] 08-Jun-2001