Search Publications
The MEGA Project for Medium Energy Gamma-ray Astronomy
Hartmann, D. H.; Ajello, M.; Di Cocco, G. +22 more
The Medium Energy Gamma-ray Astronomy (MEGA) telescope concept will soon be proposed as a MIDEX mission. This mission would enable a sensitive all-sky survey of the medium-energy gamma-ray sky (0.4 50 MeV) and bridge the huge sensitivity gap between the COMPTEL and OSSE experiments on the Compton Gamma Ray Observatory and the visionary Advanced Co…
Millisecond Pulsar Population in the Galactic Center and High Energy Contributions
Wang, Wei
We propose that there possibly exists a population of millisecond pulsars in the Galactic center region. Millisecond pulsars (MSPs) could emit GeV gamma-rays through synchrotron-curvature radiation as predicted by outer gap models. In the same time, the compact wind nebulae around millisecond pulsars can emit X-rays though synchrotron radiation an…
Magnetars' Giant Flares: the Case of SGR 1806 20
Mereghetti, Sandro; Turolla, Roberto; Tiengo, Andrea +4 more
We report on the properties of the SGR 1806 20's Giant Flare occurred on 2004 December 27th, with particular interest on the pre and post flare intensity/hardness correlated variability. We show that these findings are consistent with the picture of a twisted internal magnetic field which stresses the star solid crust, until the latter is not able…
Search for Dark Matter with GLAST
Morselli, Aldo
The detection of gamma-rays, antiprotons and positrons due to pair annihilation of dark matter particles in the Milky Way halo is a viable techniques to search for supersymmetric dark matter candidates. In particular the EGRET team has seen a convincing signal for a strong excess of emission from the Galactic center that has no simple explanation …
Cataclysmic Variables Observed with INTEGRAL
Simon, Vojtech; Hudec, René; Munz, Filip +1 more
We discuss selected results of observations of cataclysmic variables (CVs) and related objects by the instruments IBIS (far X-ray and gamma-ray imager) and OMC (Optical Monitoring Camera) onboard INTEGRAL. We concentrate on the analysis of the time behaviour of the intermediate polar (IP) V1223 Sgr, seen simultaneously by IBIS and OMC in a state w…
Unveiling the Nature of INTEGRAL Sources Through Optical Spectroscopy
Masetti, Nicola
Since its launch on October 2002 the INTEGRAL satellite is performing an deep survey of the hard X-ray sky with unprecedented sensitivity and positional accuracy. This allowed pinpointing, through positional cross-correlation with catalogs at longer wavelengths, possible optical/near-infrared candidates for the hard X-ray sources of still unknown …
High-Energy Astrophysics and the Virtual Observatory
Padovani, Paolo
The Virtual Observatory (VO) will revolutionise the way we do Astronomy by allowing easy access to all astronomical data and by making the handling and analysis of datasets at various locations across the globe much simpler and faster. I report here on the need for the VO and its status in Europe, concentrating on the recently started EURO-VO proj…
Blazars and INTEGRAL
Pian, E.; Hudec, R.; Kubánek, P. +1 more
We refer to analysis of the ESA INTEGRAL satellite data for specific class of active galactic nuclei - blazars. These objects represent promising sources to be observed by INTEGRAL, especially during their active states. Suitable strategy for the future analysis is proposed and discussed.
Microquasars: What do radio and X-ray observations tell us?
Wu, Kinwah; Rodriguez, Jérôme; Vilhu, Osmi +4 more
Microquasars, or X-ray binaries exhibiting radio jets, have been observed extensively at all wavelengths for the past decade or so. Primarily, they have been observed in the X-ray regimes and the radio. In this paper we review the radio and the X-ray behavior of the first two superluminal microquasars, GRS 1915+105 and GRO J1655-40. We show how GR…
INTEGRAL reveals a new class of obscured high mass X-ray binaries: focus on IGR J16318-4848
Chaty, Sylvain; Filliatre, Philippe
The X-ray source IGR J16318-4848 is the first source discovered by INTEGRAL on 2003, January 29, exhibiting a very high column density. On 2003, February, 23-25 we triggered a Target of Opportunity (ToO) program using the EMMI (optical) and SOFI (near-infrared, NIR) instruments on the New Technology Telescope of the European Southern Observatory (…