GX 17+2 is a bright Neutron Star Low Mass X-ray Binary. Albeit significant results were obtained ... more GX 17+2 is a bright Neutron Star Low Mass X-ray Binary. Albeit significant results were obtained from previous campaigns, many open points still remain in the understanding of such a source, in particular the origin (thermal or not) of the hard component and its behavior with the spectral state. INTEGRAL offers the opportunity to reduce these ambiguities. Com- bining data from JEM-X, IBIS and SPI to provide a complete soft to hard energy coverage, we report preliminary results based on the first year Core Pro- gram observations of GX 17+2 .
We report on a joint BeppoSAX/RossiXTE observation of the Z-type low mass X-ray binary Cyg X-2. T... more We report on a joint BeppoSAX/RossiXTE observation of the Z-type low mass X-ray binary Cyg X-2. The source was in the so-called high overall intensity state and in less than 24 hours went through all three branches of the Z-track. The continuum x-ray spectrum could be described by the absorbed sum of a soft thermal component, modeled as either a
ABSTRACT Broad-band observation of galactic X-ray binary pulsars is one of the main scientific go... more ABSTRACT Broad-band observation of galactic X-ray binary pulsars is one of the main scientific goal of the BeppoSAX mission. In this framework a key role is played by Pulse Phase Resolved Spectroscopy. In the paper we present some preliminary results on both phase-resolved spectra and pulse profile evolution with energy on two sources of this class, Cen X-3 and Her X-1.
During the INTEGRAL Core Programme observations most of the Galactic hard X- and Gamma-ray sky ha... more During the INTEGRAL Core Programme observations most of the Galactic hard X- and Gamma-ray sky has been surveyed. A particular emphasis has been dedicated to low mass X-ray binary sources such as X- ray bursters because almost 70% of them are located within 20 degrees off the Galactic Centre. We will present our first INTEGRAL results on a sample of X- Ray bursters obtained during the 2003 Core Program observations. This sample consists of at least 17 sources mainly detected during the Galactic Centre Deep Exposure. In the sample there are both transient and persistent sources with different characteristics. These observations cover a broader energy range in comparison to previous ones offering the possibility to better draw comparisons between this already established class of high energy emitters and Black Hole Candidates. Light curves and preliminary spectra are discussed.
arXiv:astro-ph/9711215v1 19 Nov 1997 ... M. Orlandini1, D. Dal Fiume1, F. Frontera1, G. Cusumano2... more arXiv:astro-ph/9711215v1 19 Nov 1997 ... M. Orlandini1, D. Dal Fiume1, F. Frontera1, G. Cusumano2, S. Del Sordo2, S. Giarrusso2, S. Piraino2, A. Segreto2, M. Guainazzi3, and L. Piro4 1 Istituto Tecnologie e Studio Radiazioni Extraterrestri (TeSRE), CNR, via Gobetti, 101, 40129 ...
The BeppoSAX Narrow Field Instruments observed the galactic source GS 1826-238 in October 1997, f... more The BeppoSAX Narrow Field Instruments observed the galactic source GS 1826-238 in October 1997, following a hard X-ray burst with a peak flux of about 100 mCrab detected by BATSE. Two short X-ray bursts (∼150 seconds) were detected up to 60 keV, ...
GX 17+2 is a bright Neutron Star Low Mass X-ray Binary. Albeit significant results were obtained ... more GX 17+2 is a bright Neutron Star Low Mass X-ray Binary. Albeit significant results were obtained from previous campaigns, many open points still remain in the understanding of such a source, in particular the origin (thermal or not) of the hard component and its behavior with the spectral state. INTEGRAL offers the opportunity to reduce these ambiguities. Com- bining data from JEM-X, IBIS and SPI to provide a complete soft to hard energy coverage, we report preliminary results based on the first year Core Pro- gram observations of GX 17+2 .
We report on a joint BeppoSAX/RossiXTE observation of the Z-type low mass X-ray binary Cyg X-2. T... more We report on a joint BeppoSAX/RossiXTE observation of the Z-type low mass X-ray binary Cyg X-2. The source was in the so-called high overall intensity state and in less than 24 hours went through all three branches of the Z-track. The continuum x-ray spectrum could be described by the absorbed sum of a soft thermal component, modeled as either a
ABSTRACT Broad-band observation of galactic X-ray binary pulsars is one of the main scientific go... more ABSTRACT Broad-band observation of galactic X-ray binary pulsars is one of the main scientific goal of the BeppoSAX mission. In this framework a key role is played by Pulse Phase Resolved Spectroscopy. In the paper we present some preliminary results on both phase-resolved spectra and pulse profile evolution with energy on two sources of this class, Cen X-3 and Her X-1.
During the INTEGRAL Core Programme observations most of the Galactic hard X- and Gamma-ray sky ha... more During the INTEGRAL Core Programme observations most of the Galactic hard X- and Gamma-ray sky has been surveyed. A particular emphasis has been dedicated to low mass X-ray binary sources such as X- ray bursters because almost 70% of them are located within 20 degrees off the Galactic Centre. We will present our first INTEGRAL results on a sample of X- Ray bursters obtained during the 2003 Core Program observations. This sample consists of at least 17 sources mainly detected during the Galactic Centre Deep Exposure. In the sample there are both transient and persistent sources with different characteristics. These observations cover a broader energy range in comparison to previous ones offering the possibility to better draw comparisons between this already established class of high energy emitters and Black Hole Candidates. Light curves and preliminary spectra are discussed.
arXiv:astro-ph/9711215v1 19 Nov 1997 ... M. Orlandini1, D. Dal Fiume1, F. Frontera1, G. Cusumano2... more arXiv:astro-ph/9711215v1 19 Nov 1997 ... M. Orlandini1, D. Dal Fiume1, F. Frontera1, G. Cusumano2, S. Del Sordo2, S. Giarrusso2, S. Piraino2, A. Segreto2, M. Guainazzi3, and L. Piro4 1 Istituto Tecnologie e Studio Radiazioni Extraterrestri (TeSRE), CNR, via Gobetti, 101, 40129 ...
The BeppoSAX Narrow Field Instruments observed the galactic source GS 1826-238 in October 1997, f... more The BeppoSAX Narrow Field Instruments observed the galactic source GS 1826-238 in October 1997, following a hard X-ray burst with a peak flux of about 100 mCrab detected by BATSE. Two short X-ray bursts (∼150 seconds) were detected up to 60 keV, ...
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