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2011MNRAS.411.1727C - Mon. Not. R. Astron. Soc., 411, 1727-1743 (2011/March-1)
Positron annihilation spectrum from the Galactic Centre region observed by SPI/INTEGRAL revisited: annihilation in a cooling ISM?
CHURAZOV E., SAZONOV S., TSYGANKOV S., SUNYAEV R. and VARSHALOVICH D.
Abstract (from CDS):
We show that the spectral shape of the annihilation radiation (the narrow 511-keV line and the associated ortho-positronium continuum) is surprisingly well described by a model of annihilation of hot positrons in a radiatively cooling interstellar medium (ISM). The model assumes that positrons are initially injected into a hot (∼106 K), volume-filling ISM, which is allowed to freely cool via radiative losses. The annihilation time in such a medium is longer than the cooling time for temperatures higher than a few 104 K. Thus, most of the positrons annihilate only after the gas has cooled down to ∼105 K, giving rise to annihilation emission characteristic of a warm, ionized ISM.
Abstract Copyright: 2010 The Authors Monthly Notices of the Royal Astronomical Society2010 RAS
Journal keyword(s): ISM: general - Galaxy: centre - gamma-rays: ISM
Simbad objects: 9
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