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Discovery of a faint 437 s X-ray pulsar 1SAX J1452.8-5949
T. Oosterbroek, M. Orlandini, A. N. Parmar +6
A new pulsar, 1SAX J1452.8-5949, was discovered during a BeppoSAX galactic plane survey on 1999 July 20 at R.A.=14h 52m 49s, Dec=-59 49' 18'' (J2000) with a 90% confidence uncertai…
BeppoSAX spectroscopy of the Hercules X-1 short-on state
T. Oosterbroek, A. N. Parmar, D. Dal Fiume +4
We present results of a 5.7 day duration BeppoSAX observation of the short-on state of Her X-1 and a short observation during the decline of the preceding main-on state. The 0.1-10…
The broad-band spectrum of OAO1657-415 with BeppoSAX: In search of cyclotron lines
M. Orlandini, D. Dal Fiume, S. Del Sordo +4
We report on a 30 ks observation of the high-mass X-ray binary pulsar OAO1657-415 performed by BeppoSAX on September 1998. The wide band spectrum is well fit by both a cutoff power…
The broad band spectral properties of binary X-ray pulsars
D. Dal Fiume, M. Orlandini, S. Del Sordo +7
The X-ray telescopes on board BeppoSAX are an optimal set of instruments to observe bright galactic binary pulsars. These sources emit very hard and quite complex X-ray spectra tha…
Strong Field Gravity and X-Ray Observations of 4U1820-30
P. Kaaret, S. Piraino, P. F. Bloser +5
The behavior of quasi-periodic oscillations (QPOs) at frequencies near 1 kHz in the x-ray emission from the neutron star x-ray binary 4U1820-30 has been interpreted as evidence for…
Discovery of Microsecond Soft Lags in the X-Ray Emission of the Atoll Source 4U1636-536
Philip Kaaret, Santina Piraino, Eric C. Ford +1
Exploiting the presence of kilohertz quasi-periodic oscillations (QPOs) in the timing power spectrum, we find that the soft x-ray emission of the neutron-star X-ray binary and atol…
Hard X-Ray Radiation in the Coma Cluster Spectrum
R. Fusco-Femiano, D. Dal Fiume, L. Feretti +5
Hard X-ray radiation has been detected for the first time in the Coma cluster by BeppoSAX. Thanks to the unprecedented sensitivity of the Phoswich Detection System (PDS) instrument…