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Swings between rotation and accretion power in a binary millisecond pulsar
Observations of accretion-powered, millisecond X-ray pulsations from a neutron star previously seen as a rotation- powered radio pulsar show the evolutionary link between accretion and rotation-powered millisecond pulsars, but also that some systems can swing between the two states on very short timescales.
SN 2003lw and GRB 031203: A Bright Supernova for a Faint Gamma-Ray Burst
Optical and near-infrared observations of the gamma-ray burst GRB 031203, at z = 0.1055, are reported. A very faint afterglow is detected superposed onto the host galaxy in our first infrared JHK
The 0.1-100 keV Spectrum of Centaurus X-3: Pulse Phase Spectroscopy of the Cyclotron Line and Magnetic Field Structure
We report spectral and temporal analysis of the X-ray pulsar Centaurus X-3 out of eclipse observed by BeppoSAX. The broadband spectrum (0.12-100 keV) is well described by an absorbed power law
The Broadband Spectrum of MXB 1728–34 Observed by BeppoSAX
We report on the results of a broadband (0.1-100 keV) spectral analysis of the bursting atoll source MXB 1728-34 (4U 1728-34) observed by the BeppoSAX satellite. Three bursts were present during this
The Discovery of a State-Dependent Hard Tail in the X-Ray Spectrum of the Luminous Z Source GX 17+2
We report results of a BeppoSAX (0.1-200 keV) observation of the Z-type low-mass X-ray binary GX 17+2. The source was on the so-called horizontal and normal branches. Energy spectra were selected
The 0.1-100 keV Spectrum of LMC X-4 in the High State: Evidence for a High-Energy Cyclotron Absorption Line
We report the spectral analysis of the X-ray pulsar LMC X-4 in its high state, out of eclipse, observed by BeppoSAX. During this observation no coherent pulsations are detected. The primary continuum
Black Hole Binaries and X-Ray Transients
We consider transient behavior in low-mass X-ray binaries (LMXBs). We show that if this results from a disk instability, the secondary star must be significantly evolved when mass transfer starts,
Magnetic-driven Orbital Evolution of an Accreting Millisecond Pulsar: Witnessing the Banquet of a Hidden Black Widow
We report here on the orbital evolution of the accreting millisecond pulsar SAX J1808.4{3658. In particular, we nd for this source the rst estimate of the orbital period derivative in an accreting
Probing the inner region of Cygnus X-1 in the low/hard state through its x-ray broadband spectrum.
We present the broadband X-ray spectrum of Cyg X-1 in the low/hard state as observed by the instruments on board BeppoSAX. The spectrum spans from 0.1 to 200 keV, allowing the total accretion
An XMM-Newton Study of the 401 Hz Accreting Pulsar SAX J1808.4–3658 in Quiescence
SAX J1808.4-3658 is a unique source, being the first low-mass X-ray binary showing coherent pulsations at a spin period comparable to that of millisecond radio pulsars. Here we present an XMM-Newton