6 papers · 1 filter
Phase-resolved spectra of the millisecond pulsar SAX J1808.4-3658
Marek Gierlinski, Chris Done, Didier Barret
We analyze the RXTE observations of the April 1998 outburst of SAX J1808.4-3658. We show that the soft blackbody component of the X-ray spectrum is from the hotspot on the neutron…
On the Origin of the MeV Gamma-Ray Background
F. W. Stecker, M. H. Salamon, C. Done
In this paper, we suggest a new hypothesis for explaining the spectrum of the extragalactic MeV gamma-ray background as observed by COMPTEL and SMM. We propose that both the flux l…
An unstable inner disk in Cyg X-1 ?
Chris Done, Piotr T. Zycki
We present the first significant detection of relativistic smearing of the X-ray reflection spectrum from the putative accretion disk in the low/hard state of Cyg X--1. The ionizat…
On accretion flow in Soft X-ray Transients
P. T. Zycki, C. Done, D. A. Smith
We have analyzed archival Ginga data of a number of Soft X-ray Transient sources and modelled them in an attempt to constrain the geometry and physical properties of accretion. Our…
The X-ray emission of the polar BL Hydri
G. Matt, R. Barcaroli, T. Belloni +8
We report on the analysis of the ASCA and BeppoSAX X-ray observations of the polar system BL Hyi. Emission from both poles is apparent in both observations; the emission from the s…
BeppoSAX observations of the long period polar system V1309 Ori
D. de Martino, R. Barcaroli, G. Matt +8
We present BeppoSAX observations of the peculiar long period polar system V1309 Ori (RXJ0515.6+0105). The source was detected simultaneously at soft and, for the first time, at har…