Search for very high energy γ radiation from the radio bright region DR4 of the SNR G78.2+2.1.

Details Search for very high energy γ radiation from the radio bright region DR4 of the SNR G78.2+2.1. Search for very high energy γ radiation from the radio bright region DR4 of the SNR G78.2+2.1.

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...314..275p&link_type=abstract

Astronomy and Astrophysics, v.314, p.275-280

Astronomy and Astrophysics

Astrophysics

18

Gamma Rays: Observations, Cosmic Rays, Ism: Supernova Remnants, Ism: Individual: G 78.2+2.1

Scientific paper

Data from the HEGRA air shower array are used to set an upper limit on the emission of γ-radiation above 25(18)TeV from the direction of the radio bright region DR4 within the SNR G78.2+2.1 of 2.5(7.1)x10^-13^cm^-2^/s. The shock front of SNR G78.2+2.1 probably recently overtook the molecular cloud Cong 8 which then acts as a target for the cosmic rays produced within the SNR, thus leading to the expectation of enhanced γ-radiation. Using a model of Drury, Aharonian and Voelk which assumes that SNRs are the sources of galactic cosmic rays via first order Fermi acceleration, we calculated a theoretical prediction for the γ-ray flux from the DR4 region and compared it with our experimental flux limit. Our `best estimate' value for the predicted flux lies a factor of about 18 above the upper limit for γ-ray energies above 25TeV. Possible reasons for this discrepancy are discussed.

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