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TOPIC: Gamma-Ray Binaries

Blobrana

L

Posts: 131433

Date: Oct 23 09:11 2012

RE: Gamma-Ray Binaries	Permalink

Title: First LOFAR Observations of Gamma-Ray Binaries Authors: Benito Marcote, Marc Ribó, Josep M. Paredes, John Swinbank, Jess Broderick, Rob Fender, Sera Markoff, Ralf Wijers A few binary systems display High Energy (100 MeV - 100 GeV) and/or Very High Energy (> 100 GeV) gamma-ray emission. These systems also display non-thermal radio emission that can be resolved with long-baseline radio interferometers, revealing the presence of outflows. It is expected that at very low frequencies the synchrotron radio emission covers larger angular scales than has been reported up to now. Here we present preliminary results of the first deep radio observations of the gamma-ray binary LS I +61 303 with LOFAR, which is sensitive to extended structures on arcsecond to arcminute scales. Read more (165kb, PDF) __________________

Blobrana

L

Posts: 131433

Date: Oct 12 22:59 2012

Gamma-ray binary systems	Permalink

Title: Binaries with the eyes of CTA Authors: J.M. Paredes, W. Bednarek, P. Bordas, V. Bosch-Ramon, E. De Cea del Pozo, G. Dubus, S. Funk, D. Hadasch, D. Khangulyan, S. Markoff, J. Moldon, P. Munar-Adrover, S. Nagataki, T. Naito, M. de Naurois, G. Pedaletti, O. Reimer, M. Ribo, A. Szostek, Y. Terada, D.F. Torres, V. Zabalza, A.A. Zdziarski, for the CTA Consortium The binary systems that have been detected in gamma rays have proven very useful to study high-energy processes, in particular particle acceleration, emission and radiation reprocessing, and the dynamics of the underlying magnetized flows. Binary systems, either detected or potential gamma-ray emitters, can be grouped in different subclasses depending on the nature of the binary components or the origin of the particle acceleration: the interaction of the winds of either a pulsar and a massive star or two massive stars; accretion onto a compact object and jet formation; and interaction of a relativistic outflow with the external medium. We evaluate the potentialities of an instrument like the Cherenkov telescope array (CTA) to study the non-thermal physics of gamma-ray binaries, which requires the observation of high-energy phenomena at different time and spatial scales. We analyse the capability of CTA, under different configurations, to probe the spectral, temporal and spatial behaviour of gamma-ray binaries in the context of the known or expected physics of these sources. CTA will be able to probe with high spectral, temporal and spatial resolution the physical processes behind the gamma-ray emission in binaries, significantly increasing as well the number of known sources. This will allow the derivation of information on the particle acceleration and emission sites qualitatively better than what is currently available. Read more (1214kb, PDF) __________________

Blobrana

L

Posts: 131433

Date: Jan 17 03:03 2012

Gamma-Ray Binaries	Permalink

Title: Revealing Gamma-Ray Binaries Authors: I. F. Mirabel Recent ground based and space telescopes that detect high energy photons from a few up to hundreds of gigaelectron volts (GeV) have opened a new window on the universe. However, because of the relatively poor angular resolution of these telescopes, a large fraction of the thousands of sources of gamma-rays observed remains unknown. Compact astrophysical objects are among those high energy sources, and in the Milky Way there is a particular class called "Gamma-Ray Binaries". Read more (365kb, PDF) __________________

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