Emission of Positron Annihilation Line Radiation by Clusters of Galaxies
arXiv:astro-ph/0201313 · doi:10.1086/340384
Abstract
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 galaxies, the line produced in clusters is not smeared by three-photon decay of positronium, because positronium formation is suppressed at the high (>~ 1 keV) temperature of the cluster electrons. We show that if AGN jets are composed of e^+e^- pairs, then the annihilation line from rich clusters within a distance of 100 Mpc might be detectable with future space missions, such as INTEGRAL or EXIST.
39 pages, 11 figures, submitted to ApJ
References in corpus (10)
- Galaxy Number Counts from the Sloan Digital Sky Survey Commissioning Data
- Cosmic Ray Electrons in Groups and Clusters of Galaxies: Primary and Secondary Populations from a Numerical Cosmological Simulation
- Intergalactic Magnetic Fields from Quasar Outflows
- The New Emerging Model for the Structure of Cooling Cores in Clusters of Galaxies
- Cosmic Ray Protons Accelerated at Cosmological Shocks and Their Impact on Groups and Clusters of Galaxies
- XMM-Newton observations of M87 and Its X-Ray Halo
- The BL Lac heart of Centaurus A
- COSMOCR: A Numerical Code for Cosmic Ray Studies in Computational Cosmology
- The Centaurus A Northern Middle Lobe as a Buoyant Bubble
- Is the Supernova Remnant RX J1713.7-3946 a Hadronic Cosmic Ray Accelerator ?
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- Disentangling the gamma-ray emission of NGC1275 and that of the Perseus cluster
- Can observations of 511 keV line from the M31 galaxy shed light on the AGN jet composition?
- The Search for Celestial Positronium via the Recombination Spectrum