Physics
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dmap.conf..340b&link_type=abstract
DARK MATTER IN ASTROPARTICLE AND PARTICLE PHYSICS. Proceedings of the 6th International Heidelberg Conference. Held 24-28 Septem
Physics
Integral, Gamma-Ray Sources, Compact Objects, Stellar Evolution, Absorption, Agn, Grb, Positronium
Scientific paper
Selected scientific highlights are presented from the first 5 years of observations of the gamma-ray sky by ESA's INTEGRAL space telescope. Its unprecedented angular resolution and sensitivity at high energies (≳ 20 keV) has allowed INTEGRAL to detect around 500 objects, many of which are new. Sources that have been classified are predominantly represented by active galactic nuclei (AGN) and X-ray binaries (XRBs) whereby a compact object (a supermassive black hole in AGN, usually a neutron star in XRBs) accretes matter from a large disk (AGN) or from a stellar companion (XRBs, often mediated by a disk). Together with unclassified sources, they account for nearly all of the diffuse Galactic background emission. Furthermore, INTEGRAL has created an all-sky map of the 511 keV distribution helping to identify potential dark matter sites. The distribution of Al-26 follows massive star-forming regions and reflects the rotation of the Galaxy. Gamma-ray bursts (GRBs) are detected in the wide field of view (FOV) at a rate of 1 per month, but INTEGRAL's design also enables it to detect GRBs outside its FOV. Previously rare, XRBs with supergiant companions are an emerging class. This underscores INTEGRAL's ability to peer through the dust that enshrouds these sources and which made them invisible to previous X-ray surveys. Their increasing numbers (as well as those of other classes) offer larger samples on which to perform statistical analyses. A synthetic view of populations of γ-ray sources is instrumental for highlighting signatures of stellar and galactic evolution. In addition, it permits a speculation on the nature of the roughly 100 sources that remain unclassified.
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