Emission of Positron Annihilation Line Radiation by Clusters of Galaxies | Zendy

Steven R. Furlanetto | Zendy; Abraham Loeb | Zendy

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Emission of Positron Annihilation Line Radiation by Clusters of Galaxies

Author(s) -

Steven R. Furlanetto,

Abraham Loeb

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/340384

Subject(s) - physics , positronium , annihilation , astrophysics , galaxy , annihilation radiation , positron , galaxy cluster , cluster (spacecraft) , cosmic ray , interstellar medium , line (geometry) , electron , nuclear physics , positron annihilation , geometry , mathematics , computer science , programming language

Clusters of galaxies are enriched with positrons from jets of active galacticnuclei (AGNs) or from the interaction of cosmic rays with the intracluster gas.We follow the cooling of these positrons and show that their eventualannihilation with cluster electrons yields a narrow annihilation line. Unlikeannihilation in the interstellar medium of galaxies, the line produced inclusters is not smeared by three-photon decay of positronium, becausepositronium formation is suppressed at the high (>~ 1 keV) temperature of thecluster electrons. We show that if AGN jets are composed of e^+e^- pairs, thenthe annihilation line from rich clusters within a distance of 100 Mpc might bedetectable with future space missions, such as INTEGRAL or EXIST.Comment: 39 pages, 11 figures, submitted to Ap

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