Search Publications
Measurement of Mass and Spin of Black Holes with QPOs
Aschenbach, B.
There are now four low mass X-ray binaries with black holes which show twin resonant-like HFQPOs. Similar QPOs might have been found in Sgr A*. I review the power spectral density distributions of the three X-ray flares and the six NIR flares published for Sgr A* so far, in order to look for more similarities than just the frequencies between the …
Obscured Sources and Supergiant Fast X-ray Transients: New Classes of High Mass X-ray Binaries
Chaty, S.
A new type of high-energy binary systems has been revealed by the INTEGRAL satellite. These sources are in the course of being unveiled by means of multi-wavelength optical, near-and mid-infrared observations. Among these sources, two distinct classes are appearing: the first one is constituted of intrinsically obscured high-energy sources, of whi…
INTEGRAL and Swift Observations of Blazars in Outburst
Ghisellini, G.; Pian, E.; Foschini, L.
The blazars 3C 454.3, PKS 0537-441 and PKS 2155-304 are traditionally known to be among the most active sources of this class. They emit at all frequencies, up to gamma-rays, and are good probes of multiwavelength nuclear variability. The first two also have luminous broad emission line regions. We have recently monitored them with various facilit…
Soft Gamma Repeaters: New Results and Surprises from Swift, INTEGRAL, and the Interplanetary Network
Hurley, K.
The history and observational properties of the soft gamma repeaters are reviewed. Over the past decades, we have gone from viewing these objects as a special class of cosmic gamma-ray burst, to seeing them as one manifestation of magnetars. There is now a solid body of multi-wavelength observations, as well as some more controversial properties. …
X-Ray Spectroscopy of SN1006 with Suzaku
Yamaguchi, H.; Koyama, K.; Bamba, A.
We report the Suzaku results on the structures of the thermal plasmas and non-thermal emissions from SN 1006, a type Ia supernova remnant. Clear evidence for a type Ia SNR is found in the metal abundances of the ejecta. Stringent constraint on the maximum electron energy and the synchrotron loss time are given from the non-thermal spectrum.
Spectral Analysis of LMC-X2 with XMM/Newton
Robba, N. R.; Iaria, R.; di Salvo, T. +2 more
We present the results of the analisys of an archival observation of LMC X-2 performed with XMM/Newton. The spectra of this source has never been analyzed with a high precision instrument before. The spectrum of the source can be fitted with a blackbody with a temperature 1.5 keV plus a disk blackbody at 0.8 keV. We argue that the emission of this…
New Results on Cataclysmic Variables Observed by INTEGRAL
Gális, R.; Hudec, R.; Šimon, V. +1 more
The results of investigations of cataclysmic variables and related objects with the ESA INTEGRAL satellite mostly within the Core Programme are presented and discussed. It is evident that the INTEGRAL satellite serves as an efficient tool to study some of these objects, especially those containing a magnetic white dwarf.
X-Ray and Optical Followup of Gamma-Ray (up to TeV) Sources
Masetti, N.
The imaging capabilities of the INTEGRAL and HESS observatories allow the study of hard X-ray and TeV sources with unprecedented positional accuracy. Here I review the multiwavelength followup studies which are currently being performed on the unidentified sources detected by these facilities in order to unveil their actual nature.
Microquasars: A Brief Overview and a Snapshot of GRS 1915+105 with INTEGRAL
Rodriguez, J.; Hannikainen, D. C.
Microquasars, sources of relativistic motion, have generated a lot of interest since their discovery. In this paper we shall briefly review some general properties of microquasars, and then focus on some recent observations of one of the more notorious microquasars, GRS 1915+105.
High Resolution and Broad Band Spectra of Low Mass X-ray Binaries: a Comparison between Black Holes and Neutron Stars
Iaria, Rosario; Di Salvo, Tiziana; Burderi, Luciano +1 more
A common question about compact objects in high energy astrophysics is whether it is possible to distinguish black hole from neutron star systems with some other property that is not the mass of the compact object. Up to now a few characteristics have been found which are typical of neutron stars (like quasi periodic oscillations at kHz frequencie…