LEDAS  
Leicester Database and Archive Service
 
ARNIE Index
ARNIE Help
ARNIE Tutorial
Search...
All databases
All helpfiles
Line
Footer
E-mail

LMCXRAY: Help

LMCXRAY - LMC X-Ray Discrete Sources


Overview

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.

Catalog Bibcode

1991ApJ...374..475W

References

Wang, Q., Hamilton, T., Helfand, D. J., and Wu, X. 1991, ApJ, 374, 475.

Parameters

Name
The name is derived from the numeric designation given in the original reference and the prefix "LMC".

RA
The Right Ascension in sexagesimal units.

Dec
The Declination in sexagesimal units.

LII
The galactic longitude in degrees.

BII
The galactic latitude in degrees.

RA_B1950
Right Ascension in B1950 Equinox

Dec_B1950
Declination in B1950 Equinox

Count_Rate
The count rate in counts/s in the IPC broad-band of 0.16 to 3.5 keV.

Count_Rate_Error
The count rate error in counts/sec.

Hardness_Ratio
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).

SNR
The signal-to-noise ratio.

Source_Type
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
  

Alt_Name
An alternate designation for sources that were tabulated in the Long, Helfand, and Grabelsky (1981, ApJ, 248, 925) list of LMC X-ray sources.

Ext_Flag
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').

Comments
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.

Class
BROWSE classification type. The classification is based on the Source Type parameter.


Contact Person

Questions regarding the LMCXRAY database table can be addressed to the HEASARC User Hotline.
If you have any problems, please consult the help page or mail ledas-help@star.le.ac.uk
 
HOME
SEARCH
SERVICES INFO SOFTWARE ViZieR BLASTA DSS
ARCHIVES ASCA CHANDRA GINGA ROSAT ARNIE