Journal
ASTRONOMY & ASTROPHYSICS
Volume 448, Issue 3, Pages 873-880Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20053744
Keywords
gamma-rays : observations; pulsars : individual : PSR b0540-69; X-rays : binaries; X-rays : galaxies; Magellanic Clouds
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Two observation campaigns in 2003 and 2004 with the INTEGRAL satellite have provided the first sensitive survey of the Large Magellanic Cloud with an imaging instrument in the hard X-ray range ( 15 keV - 10 MeV). The high energy flux and long-term variability of the black hole candidate LMC X -1 was measured for the first time without contamination by the nearby (similar to 25') young pulsar PSR B0540 - 69. We studied the accreting pulsar LMC X - 4 by constraining the size of the hard X-ray emitting region (<= 3 x 10(10) cm) from analysis of its eclipses and by measuring its spin period (13.497 +/- 0.005 s) in the 20 - 40 keV band. As it was in a soft state during the first observation and possibly in an extremely low state in the second one, LMC X - 3 was not detected. Thanks to the large field of view of the IBIS instrument, we could also study other sources falling serendipitously in the observed sky region around the LMC: the Galactic low mass X-ray binary EXO 0748 - 676, the accreting pulsar SMC X-1 in the Small Magellanic Cloud, and the Active Galactic Nucleus IRAS 04575 - 7537. In addition we discovered five new hard X-ray sources, two of which most likely belong to the LMC.
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