LMC X-4
Abstract
D. Dal Fiume, F. Frontera, and M. Orlandini, TESRE, Bologna; A. Santangelo, S. Del Sordo, IFCAI, Palermo; L. Piro, IAS, Frascati; A. Coletta, G. Celidonio, G. D'Andreta, G. Gandolfi, G. Spoliti, and D. Ricci, BeppoSAX, Rome; and J. M. Muller, SRON, Utrecht, report: "The BeppoSAX Wide Field Cameras detected five major flares from the x-ray pulsar LMC X-4 during Mar. 21.7882-21.7981 UT. The most prominent flare reached a flux level of about 300 mCrab (2-26 keV). The duration of each flare was about 100 s. The pre- /post-flaring flux level of LMC X-4 is estimated at about 28 mCrab (2-26 keV). The x-ray emission from LMC X-4 during flares is remarkably softer than in the pre-/post-flaring phases. Our detection is consistent both in shape and intensity with the earlier GINGA detection (Levine et al. 1991, Ap.J. 381, 101). There is no appreciable gamma-ray flux increase corresponding to the observed flares, with a 90-percent upper limit of 110 mCrab above 40 keV."
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- March 1997
- Bibcode:
- 1997IAUC.6608....2D