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Title: Recombining plasma in the gamma-ray-emitting mixed-morphology supernova remnant 3C 391

A group of middle-aged mixed-morphology (MM) supernova remnants (SNRs) interacting with molecular clouds (MCs) has been discovered to be strong GeV gamma-ray emitters by the Large Area Telescope (LAT) on board the Fermi Gamma-Ray Space Telescope (Fermi-LAT). The recent observations of the Suzaku X-ray satellite have revealed that some of these interacting gamma-ray-emitting SNRs, such as IC443, W49B, W44, and G359.1-0.5, have overionized plasmas. 3C 391 (G31.9+0.0) is another Galactic MM SNR interacting with MCs. It was observed in GeV gamma rays by Fermi-LAT as well as in the 0.3-10.0 keV X-ray band by Suzaku. In this work, 3C 391 was detected in GeV gamma rays with a significance of ∼18σ and we showed that the GeV emission is point-like in nature. The GeV gamma-ray spectrum was shown to be best explained by the decay of neutral pions assuming that the protons follow a broken power-law distribution. We revealed radiative recombination structures of silicon and sulfur from 3C 391 using Suzaku data. In this paper, we discuss the possible origin of this type of radiative plasma and hadronic gamma rays.
Authors:
;  [1] ; ; ;  [2] ; ;  [3]
  1. TUBITAK Space Technologies Research Institute, ODTU Campus, 06531 Ankara (Turkey)
  2. Saha Institute of Nuclear Physics, Kolkata, West Bengal 700064 (India)
  3. Physics Department, Bogazici University, Bebek, 34342 Istanbul (Turkey)
Publication Date:
OSTI Identifier:
22365572
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 790; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DECAY; DISTRIBUTION; EMISSION; GALAXIES; GAMMA RADIATION; GAMMA SPECTRA; GEV RANGE; KEV RANGE; PIONS NEUTRAL; PLASMA; RECOMBINATION; SILICON; SPACE; SUPERNOVA REMNANTS; TELESCOPES; X RADIATION