Coded mask X-ray images of the Large Magellanic Cloud - Hard X-ray emission from EXO 053109-6609.2

Astronomy and Astrophysics – Astronomy

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Astronomical Spectroscopy, Magellanic Clouds, Spaceborne Astronomy, X Ray Astronomy, X Ray Imagery, X Ray Sources, Exosat Satellite, Luminosity, Spaceborne Telescopes, X Ray Telescopes

Scientific paper

Hard X-ray (2-32 keV) imaging observations of the Large Magellanic Cloud (LMC) with the University of Birmingham coded mask X-ray telescope (SL2 XRT) have detected significant high-energy flux from EXO 053109-6609.2, a source recently discovered at soft X-ray energies with Exosat. The conclusion reached by Brunner that the source has a very hard spectrum is confirmed. Assuming the source to be in the LMC, its luminosity in the 2-10 keV energy band is about 10 to the 37th erg/s. A comparison of the SL2 XRT flux with observations with other instruments shows that the source is highly variable on a time-scale of years or less. The spectral and temporal characteristics of this source are consistent with an identification as either a Be star/neutron star binary system or a background active galactic nucleus. Recent spectroscopic observations favor the former.

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