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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A relativistic bremsstrahlung/inverse Compton origin for 2EG J1857+0118 associated with supernova remnant W44
Astrophysical Journal, Volume 482, No. 2 PART I, Year 1997
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Description
We show that relativistic bremsstrahlung and inverse Compton scattering of radio-emitting electrons can easily account for the observed γ-ray spectrum of 2EG J1857+0118 if the field strength in the shell is below ∼30 μG. This source is located at the eastern border of the composite SNR W44, where the expanding radio shell is interacting with a dense molecular cloud. The nondetection of this remnant above 250 GeV implies a cutoff or steepening in the electron spectrum above ∼100 GeV. The E-1.66 spectrum of this radio/γ-ray-emitting electron component is too flat to have its origin in standard first-order Fermi acceleration, but electron injection into the shell by the pulsar PSR B1853+01 over the 2 × 104 yr lifetime may explain why the Crab-like radio spectrum (Sv ∝ v-0.33) is about the hardest of all shell-type remnants. The injected energy would be sufficient to account for the required energy of 6 × 1049 ergs if the initial spin-down power of PSR B1853+01 was about 10 times larger than the present spin-down power of the Crab pulsar. A steeper Fermi electron component may be present, but the observational data are not constraining enough to provide a meaningful limit on the presence of an additional ∼E-2 shell-type electron component. The predicted γ-ray contribution from high-energy proton-gas interactions is about 20% of the observed EGRET flux above 100 MeV, which confirms our conclusion that the γ-ray emission from W44 is dominated by a leptonic component. © 1997. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
de Jager, Ocker C.
South Africa, Potchefstroom
North-west University
Mastichiadis, Apostolos
Germany, Heidelberg
Max-planck-institut Für Kernphysik
Statistics
Citations: 29
Authors: 2
Affiliations: 2
Identifiers
Doi:
10.1086/304177
ISSN:
0004637X
e-ISSN:
15384357
Research Areas
Environmental