Publications (45)
The failed state transition of the ATOLL source GRS 1724-308
A. Tarana, F. Capitanio, M. Cocchi
The 2004-2012 X-ray time history of the NS LMXB GRS 1724-308 shows, along with the episodic brightenings associated to the low-high state transitions typical of the ATOLL sources,…
Turmoil on the accretion disk of GRO J1655-40
E. Kuulkers, J. J. M. in 't Zand, R. Cornelisse +7
During the 1996/1997 outburst of the X-ray transient GRO J1655-40 the Wide Field Cameras onboard BeppoSAX observed the system with nearly continuous coverage during some stages of…
First IBIS results on the high energy emission of Cyg X-2
L. Natalucci, M. Del Santo, P. Ubertini +4
The bright low-mass X-ray binary Cyg X-2 was in the field of view of the IBIS telescope during the early Cygnus region observations, executed during the INTEGRAL Performance Verifi…
Long term BeppoSAX-WFC monitoring of GRS 1758-258
M. Cocchi, M. J. S. Smith, J. M. Muller +5
Following a series of deep observations of the Galactic Bulge region performed with the Wide Field Cameras on board BeppoSAX, it has been possible to study throughout a long time p…
Observations of Eddington-limited type-I X-ray bursts from 4U 1812-12
M. Cocchi, A. Bazzano, L. Natalucci +5
During more than 3 years (August 1996-October 1999) monitoring of a 40x40 degree sky region around the Galactic Centre by the Wide Field Cameras on board BeppoSAX, a total of 8 typ…
X-ray spectropolarimetry of the bright atoll Serpens X-1
F. Ursini, A. Gnarini, S. Bianchi +11
We present simultaneous X-ray polarimetric and spectral observations of the bright atoll source Ser~X-1 carried out with the Imaging X-ray Polarimetry Explorer (IXPE), NICER, and N…
Discovery of the X-ray burster SAX J1752.3-3138
M. Cocchi, A. Bazzano, L. Natalucci +5
During a 50 ks monitoring observation of the Galactic bulge performed in September 1999 by the Wide Field Cameras on board the BeppoSAX satellite, an X-ray burst was detected from…
Photospheric radius expansion X-ray bursts as standard candles
E. Kuulkers, P. R. den Hartog, J. J. M. in 't Zand +3
We examined the maximum bolometric peak luminosities during type I X-ray bursts from the persistent or transient luminous X-ray sources in globular clusters. We show that for about…
Detection of X-ray bursts in the globular cluster NGC 6652
J. J. M. in 't Zand, F. Verbunt, J. Heise +5
Two type I X-ray bursts were detected from a position consistent with the transient X-ray source in NGC 6652 with the Wide Field Camera of the BeppoSAX satellite, strongly suggesti…
X-ray polarimetry and spectroscopy of the neutron star low-mass X-ray binary GX 9+9: an in-depth study with IXPE and NuSTAR
F. Ursini, R. Farinelli, A. Gnarini +101
We report on a comprehensive analysis of simultaneous X-ray polarimetric and spectral data of the bright atoll source GX 9+9 with the Imaging X-ray Polarimetry Explorer (IXPE) and…
Two spectral states of the transient X-ray burster SAX J1747.0-2853
L. Natalucci, A. Bazzano, M. Cocchi +4
The neutron star binary SAX J1747.0-2853, located in the Galactic Center region at about 0.5 deg from Sgr A* and at a distance of 9 kpc, has been observed in outburst four times (1…
A half-a-day long thermonuclear X-ray burst from KS 1731-260
E. Kuulkers, J. J. M. in 't Zand, M. H. van Kerkwijk +7
We report on an approximately twelve hour long X-ray flare from the low-mass X-ray binary KS 1731-260. The flare has a rise time of less than 13 min and declines exponentially with…
X-ray bursts from 1RXS J170930.2-263927 = XTE J1709-267
M. Cocchi, A. Bazzano, L. Natalucci +5
We report evidence of type-I X-ray bursting activity from the transient 1RXS J170930.2-263927 when it was in outburst early 1997. This identifies the source as a probable low-mass…
Polarised light from accreting low mass X-ray binaries
F. Capitanio, A. Gnarini, S. Fabiani +5
Thanks to IXPE , the X-ray spectro-polarimeter launched at the end of 2021, X-ray polarimetry has finally become an extraordinary tool in investigating the physics of accretion in…
A new X-ray outburst in the globular cluster NGC 6440: SAX J1748.9-2021
J. J. M. in 't Zand, F. Verbunt, T. E. Strohmayer +8
For the second time in 27 years a bright transient X-ray source has been detected coincident with the globular cluster NGC 6440. It was found to be active in August, 1998, with the…
SAX J1810.8-2609: an X-ray bursting transient
M. Cocchi, A. Bazzano, L. Natalucci +5
We report on the BeppoSAX/WFC observation of a strong type-I X-ray burst from the recently discovered transient source SAX J1810.8-2609. The observed event showed evidence of photo…
First broad band study of the mysterious source 1E 1743.1-2843
M. Del Santo, L. Sidoli, A. Bazzano +4
In the last years, the persistent source 1E 1743.1-2843 has been observed in the X-rays, but never above 20 keV. In previous works, it was stressed that a possible high energy emis…
The INTEGRAL LMXRB Monitoring Programme
A. Paizis, T. J. -L. Courvoisier, O. Vilhu +21
Our collaboration is responsible for the study of a sample of 72 low mass X-ray binaries (LMXRB) using the INTEGRAL Core Programme data. In this paper we describe the monitoring pr…
Spectral states and transient behaviour of a sample of X-ray bursters observed by BeppoSax
L. Natalucci, A. Bazzano, F. Capitanio +3
During observation campaigns of the Galactic Bulge region, BeppoSAX detected a total of 21 new X-ray bursters in about 6 years of operation. These sources are mostly transient and…
X-ray and soft gamma-ray behaviour of the Galactic source 1E 1743.1-2843
M. Del Santo, L. Sidoli, A. Bazzano +4
The X-ray persistent source 1E 1743.1-2843, located in the Galactic Centre region, has been detected by all X-ray telescope above 2 keV, whereas it is not visible in the soft X-ray…
Discovery of the neutron star nature of SLX 1737-282
J. J. M. in 't Zand, F. Verbunt, E. Kuulkers +7
SLX 1737-282 is a persistent moderately bright X-ray source 1.2 deg from the Galactic center. X-ray observations with the Wide Field Cameras on BeppoSAX have for the first time rev…
BeppoSAX observations of the nearby low-mass X-ray binary and fast transient SAX J1819.3-2525
J. J. M. in 't Zand, E. Kuulkers, A. Bazzano +7
SAX J1819.3-2525 is a nearby X-ray transient which exhibited a fast and large X-ray outburst on Sep. 15, 1999 (Smith et al. 1999). The Wide Field Cameras and the Narrow Field Instr…
Wide band observations of the new X-ray burster SAX J1747.0-2853 during the March 1998 outburst
L. Natalucci, A. Bazzano, M. Cocchi +4
We report on our discovery and follow-up observations of the X-ray source SAX J1747.0-2853 detected in outburst on 1998, March 10 with the BeppoSAX Wide Field Cameras in the energy…
Broad-band X-ray measurements of GS 1826-238
J. J. M. in 't Zand, J. Heise, E. Kuulkers +3
The broad band X-ray spectrum of the low-mass X-ray binary (LMXB) GS1826-238 was measured with the narrow-field instruments on BeppoSAX on April 6 and 7, 1997. The spectrum is cons…
Discovery of type-I X-ray bursts from GRS 1741.9-2853
M. Cocchi, A. Bazzano, L. Natalucci +4
For the first time X-ray bursts have been detected from a sky position consistent with the one of GRS 1741.9-2853, a GRANAT transient source located only ~10' from the Galactic Cen…
Wide band observations of the X-ray burster GS 1826-238
M. Cocchi, R. Farinelli, A. Paizis +1
GS 1826-238 is a well-studied X-ray bursting neutron star in a low mass binary system. Thermal Comptonisation by a hot electron cloud is a widely accepted mechanism accounting for…
X-Ray Polarization from the Atoll 4U 1735-44 Suggests a Low Inclination
M. A. DÃaz Teodori, A. Bobrikova, A. Gnarini +17
X-ray polarimetry is a new tool capable of probing the geometry of accretion onto weakly magnetized neutron stars. Here we present the first X-ray spectropolarimetric results from…
SAX J1810.8-2609: A New Hard X-ray Bursting Transient
L. Natalucci, A. Bazzano, M. Cocchi +5
The transient X-ray source SAX J1810.8-2609 was discovered on 1998, March 10 with the Wide Field Cameras on board the BeppoSAX satellite, while observing the Galactic Bulge in the…
"Clocked" Bursts From GS 1826-238
M. Cocchi, A. Bazzano, L. Natalucci +5
We report on the long term monitoring of the GINGA transient source GS 1826-238 performed with the BeppoSAX Wide Fiels Camera (WFC) instrument, during four different observing camp…
The first outburst of SAX J1808.4-3658 revisited
J. J. M. in 't Zand, R. Cornelisse, E. Kuulkers +8
Data of the 1996 outburst of the single-known accreting millisecond pulsar SAX J1808.4-3658, taken with the Wide Field Cameras (WFCs) on BeppoSAX, are revisited with more complete…
Six years of BeppoSAX Wide Field Cameras observations of nine galactic type-I X-ray bursters
R. Cornelisse, J. J. M. in 't Zand, F. Verbunt +7
We present an overview of BeppoSAX Wide Field Cameras observations of the nine most frequent type-I X-ray bursters in the Galactic center region. Six years of observations (from 19…
Discovery of the X-ray transient SAX J1808.4-3658, a likely low mass X-ray binary
J. J. M. in 't Zand, J. Heise, J. M. Muller +4
We report the discovery of a fairly bright transient during observations with the Wide Field Cameras on board the BeppoSAX satellite in September 1996. It was detected at a peak in…
Two separate spectral substates within Low-Hard States of NS-LMXBs
M. Cocchi
The whole BeppoSAX archive was screened for observations of Neutron Star (NS) Low-Mass X-ray Binaries, in order to characterise the X-ray properties of this class of sources when o…
Bright X-ray bursts from 1E 1724-3045 in Terzan 2
M. Cocchi, A. Bazzano, L. Natalucci +4
During about 3 years wide field monitoring of the Galactic Center region by the WFC telescopes on board the BeppoSAX satellite, a total of 14 type-I X-ray bursts were detected from…
Burst-properties as a function of mass accretion rate in GX 3+1
P. R. den Hartog, J. J. M. in 't Zand, E. Kuulkers +6
GX 3+1 is a low-mass X-ray binary that is persistently bright since its discovery in 1964. It was found to be an X-ray burster twenty years ago proving that the compact object in t…
Accretion geometry of the neutron star low mass X-ray binary Cyg X-2 from X-ray polarization measurements
R. Farinelli, S. Fabiani, J. Poutanen +92
We report spectro-polarimetric results of an observational campaign of the bright neutron star low-mass X-ray binary Cyg X-2 simultaneously observed by IXPE, NICER and INTEGRAL. Co…
X-ray spectral evolution of SAX J1747.0-2853 during outburst activity and confirmation of its transient nature
N. Werner, J. J. M. in 't Zand, L. Natalucci +6
SAX J1747.0-2853 is an X-ray transient which exhibited X-ray outbursts yearly between 1998 and 2001, and most probably also in 1976. The outburst of 2000 was the longest and bright…
ORIGIN: Metal Creation and Evolution from the Cosmic Dawn
J. W. den Herder, L. Piro, T. Ohashi +156
ORIGIN is a proposal for the M3 mission call of ESA aimed at the study of metal creation from the epoch of cosmic dawn. Using high-spectral resolution in the soft X-ray band, ORIGI…
INTEGRAL high energy behaviour of 4U 1812-12
A. Tarana, A. Bazzano, P. Ubertini +5
The low mass X-ray binary system 4U 1812-12 was monitored with the INTEGRAL observatory in the period 2003-2004 and with BeppoSAX on April 20, 2000. We report here on the spectral…
A new bursting X-ray transient: SAX J1750.8-2900
L. Natalucci, R. Cornelisse, A. Bazzano +5
We have analysed in detail the discovery measurements of the X-ray burster SAX J1750.8-2900 by the Wide Field Cameras on board BeppoSAX in spring 1997, at a position ~1.2 degrees o…
Discovery of SAX J1753.5-2349 and SAX J1806.5-2215: two X-ray bursters without detectable steady emission
J. J. M. in 't Zand, J. Heise, J. M. Muller +4
We report the discovery with BeppoSAX-WFC of two new X-ray sources that were only seen during bursts: SAX J1753.5-2349 and SAX J1806.5-2215. For both sources, no steady emission wa…
Bursts from GS 1826-238: a clocked thermonuclear flashes generator
P. Ubertini, A. Bazzano, M. Cocchi +4
The transient X-ray source GS 1826-238 was monitored during five different observing periods between August 1996 and October 1998 with the BeppoSAX Wide Field Camera instrument in…
New insights on the puzzling LMXB 1RXS J180408.9-342058: the intermediate state, the clocked type-I X-ray bursts and much more
A. Marino, M. Del Santo, M. Cocchi +7
1RXS J180408.9--342058 is a low mass X-ray binary hosting a neutron star, which shows X-ray activity at very different mass-accretion regimes, from very faint to almost the Eddingt…
BeppoSAX Wide Field Cameras observations of six type I X-ray bursters
R. Cornelisse, F. Verbunt, J. J. M. in 't Zand +7
We have discovered three certain (SAX J1324.5-6313, 2S 1711-339 and SAX J1828.5-1037) and two likely (SAX J1818.7+1424 and SAX J2224.9+5421) new thermonuclear X-ray burst sources w…
The nature of the X-ray transient SAX J1711.6-3808
J. J. M. in 't Zand, C. B. Markwardt, A. Bazzano +8
SAX J1711.6-3808 is an X-ray transient in the Galactic bulge that was active from January through May of 2001 and whose maximum 1-200 keV luminosity was measured to be 5X10-9 erg/s…