LMCXRAY - LMC X-Ray Discrete Sources
This database table contains 105 "discrete" (i.e., more compact than 1.25
arcminutes) and 9 "large-diameter" (detected using a detection circle
radius of 2 arcminutes) Einstein IPC X-ray sources in the direction of
the Large Magellanic Cloud (LMC) that are tabulated in Tables 2 and 4,
respectively, of Wang et al. (1991, ApJ, 374, 475). For full details
of the data processing and selection used to create this source catalog,
the above reference should be consulted.
Wang, Q., Hamilton, T., Helfand, D. J., and Wu, X. 1991, ApJ, 374, 475.
The name is derived from the numeric designation given in the original
reference and the prefix "LMC".
The Right Ascension in sexagesimal units.
The Declination in sexagesimal units.
The galactic longitude in degrees.
The galactic latitude in degrees.
Right Ascension in B1950 Equinox
Declination in B1950 Equinox
The count rate in counts/s in the IPC broad-band of 0.16 to 3.5 keV.
The count rate error in counts/sec.
The spectral hardness ratio, defined as [CR(hard)-CR(soft)]/CR(broad)
where CR(hard) is the count rate in the 0.8 to 3.5 keV band, CR(soft)
is the count rate in the 0.16 to 0.8 keV band, and CR(broad) is the
count rate in the 0.16 to 3.5 keV band (i.e., the tabulated count rate).
The signal-to-noise ratio.
A source-class identifier code:
1 = supernova remnant
2 = LMC binary system
3 = OB Association, H II filament, etc.
4 = no identification
5 = foreground galactic star
6 = background AGN
An alternate designation for sources that were tabulated in the Long,
Helfand, and Grabelsky (1981, ApJ, 248, 925) list of LMC X-ray sources.
A flag to indicate whether the source is compact, i.e., less than about 2.5'
in diameter ('Y'), or of large angular diameter, i.e., of several arc minutes
in diameter ('N').
Various comments and annotations concerning the X-ray properties and/or
optical and radio identifications of the sources. Unless otherwise noted
as "(LMC)", all stellar type designations (e.g., G2 V) refer to foreground
galactic stars. "HRI" implies a detection with the Einstein High Resolution
Imager, while "v" implies multiple IPC or IPC + HRI pointings suggesting
the source is variable.
BROWSE classification type. The classification is based on the Source Type
Questions regarding the LMCXRAY database table can be addressed to the
HEASARC User Hotline.
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