SIMBAD references

1999A&AS..139..277H - Astron. Astrophys., Suppl. Ser., 139, 277-295 (1999/October-2)

A ROSAT PSPC catalogue of X-ray sources in the LMC region.


Abstract (from CDS):

We analyzed more than 200 ROSAT PSPC observations in a 10 by 10 degree field centered on the Large Magellanic Cloud (LMC) and performed between 1990 and 1994 to derive a catalogue of X-ray sources. The list contains 758 sources with their X-ray properties. From cross-correlations of the PSPC catalogue with the SIMBAD data base and literature searches we give likely identifications for 144 X-ray sources based on positional coincidence, but taking into account X-ray properties like hardness ratios and source extent. 46 known sources are associated with supernova remnants (SNRs) and candidates in the LMC, most of them already detected by previous X-ray missions. Including the new candidates from Haberl & Pietsch (1999A&A...344..521H) based on variability studies of the sources in our PSPC catalogue, the number of X-ray binaries in the LMC increased to 17 and that of the supersoft sources (SSSs) to 9. The remaining ∼50% of the identified sources comprise mainly foreground stars (up to 57) and background extragalactic objects (up to 15). The often distinguished X-ray properties of the different source types were used for a first classification of new, unknown X-ray sources. Eight new PSPC sources are classified as SNRs from their hardness ratios and one promising new SNR candidate with extended X-ray emission is found further north than all known SNRs. Three soft X-ray sources have hardness ratios compatible to those of the known SSSs. A selection on hardness ratios and X-ray to optical flux ratio further suggests 27 foreground stars and 3 AGN.

Abstract Copyright:

Journal keyword(s): catalogues - galaxies: magellanic clouds - galaxies: stellar content - X-rays: galaxies - X-rays: stars

VizieR on-line data: <Available at CDS (J/A+AS/139/277): table1.dat + tables 4,5,6,7,8,9,12 + refs>

Nomenclature: Table 1: [HP99] NNNN N=758 among (Nos 1-1367).

Simbad objects: 814

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