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Discovery of an Old, Nearby, and Overlooked Supernova Remnant Centered on the Southern Constellation Antlia Pneumatica
McCullough, P. R.; Fields, Brian D.; Pavlidou, Vasiliki
We report the discovery of a supernova remnant (SNR) with an angular diameter of 24°, centered on the southern constellation Antlia Pneumatica. The SNR is detected well in Hα and X-rays. Within the Antlia SNR's outline, a marginally significant feature is detected in the 1.8 MeV gamma-ray line of the radioisotope 26Al. At an estimated d…
Identifying Gamma-Ray Burst Remnants through Positron Annihilation Radiation
Loeb, Abraham; Furlanetto, Steven R.
We model the annihilation of relic positrons produced in a gamma-ray burst (GRB) after its afterglow has faded. We find that the annihilation signal from at least one GRB remnant in the Milky Way should be observable with future space missions such as the International Gamma-Ray Astrophysical Laboratory and the Energetic X-ray Imaging Survey Teles…
Emission of Positron Annihilation Line Radiation by Clusters of Galaxies
Loeb, Abraham; Furlanetto, Steven R.
Clusters of galaxies are enriched with positrons from jets of active galactic nuclei (AGNs) or from the interaction of cosmic rays with the intracluster gas. We follow the cooling of these positrons and show that their eventual annihilation with cluster electrons yields a narrow annihilation line. Unlike annihilation in the interstellar medium of …
Detectability and characteristics of the 2.223 MeV line emission from nearby X-ray binaries
Guessoum, N.; Jean, P.
We present an application and an improvement of the model of Jean & Guessoum (\cite{JG01}) for the production of the 2.223 MeV line resulting from the capture of neutrons in the atmosphere of the secondary in an X-ray binary system. In this model, the neutrons are produced in the accretion disk around the compact primary star and radiated in a…
PICsIT: a position sensitive detector for space applications
Di Cocco, G.; Malaguti, G.; Schiavone, F. +8 more
Pixellated Imaging CsI Telescope (PICsIT) is the high energy detector plane of Imager on Board INTEGRAL Satellite (IBIS), one of the main instruments on board the International Gamma-Ray Astrophysics Laboratory (INTEGRAL) satellite that will be launched in the year 2001. It consists of 4096 CsI(Tl) individual detector elements and operates in the …