Mathematics – Probability
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999head....4.1503o&link_type=abstract
American Astronomical Society, HEAD meeting #4, #15.03; Bulletin of the American Astronomical Society, Vol. 31, p.712
Mathematics
Probability
Scientific paper
The 38 s X-ray binary pulsar OAO1657--415 shows one of the hardest spectra among X-ray pulsars, without any evidence of steepening at high (>10 keV) energy. The high energy instruments aboard BeppoSAX, namely HPGSPC and PDS, are the best suited to detect high energy cutoff in hard sources. Indeed, a 30 ksec observation of OAO1657--415 detected for the first time a change of slope in its spectrum, at ~ 15 keV. The wide band spectrum is well fit by both a cutoff power law, or a power law modified by a high energy cutoff. The two models are equivalent. The inclusion of a cyclotron resonance feature (CRF) at 36 keV significantly improves the chi (2) for the cutoff model (Probability of Chance Improvement (PCI) 1.3x 10(-5) ), while the PCI for the power law plus high energy cutoff model is moderately high (4.5%). The statistical significance of our data is not sufficient to constrain the CRF width but by fixing its value to a canonical value of 10 keV, the relation between CRF energy and its FWHM (explained in terms of Doppler broadening of the electrons responsible of the CRF) is fulfilled.
dal Fiume Daniele
Del Sordo Stefano
Frontera Filippo
Orlandini Mauro
Parmar Arvind N.
No associations
LandOfFree
Hunting for Cyclotron Lines with BeppoSAX: OAO1657--415 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Hunting for Cyclotron Lines with BeppoSAX: OAO1657--415, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hunting for Cyclotron Lines with BeppoSAX: OAO1657--415 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-889407