1996A&A...314..275P

Query : 1996A&A...314..275P

1996A&A...314..275P - Astronomy and Astrophysics, volume 314275-280 (1996/10-1)

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

PROSCH C., FEIGL E., PLAGA R., ARQUEROS F., CORTINA J., FERNANDEZ J., FERNANDEZ P., FONSECA V., FUNK B., GONZALEZ J.C., HAUSTEIN V., HEINZELMANN G., KARLE A., KRAWCZYNSKI H., KRENNRICH F., KUEHN M., LINDNER A., LORENZ E., MAGNUSSEN N., MARTINEZ S., MATHEIS V., MERCK M., MEYER H., MIRZOYAN R., MOELLER H., MORALEJO A., MUELLER N., PADILLA L., PRAHL J., RHODE W., SAMORSKI M., SANCHEZ J.A., SANDER H., SCHMELE D., STAMM W., WAHL H., WESTERHOFF S., WIEBEL-SOOTH B. and WILLMER M.

Abstract (from CDS):

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)x10–13cm–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.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: observations - cosmic rays - ISM: supernova remnants - ISM: individual: G 78.2+2.1 (GRS G078.20 +02.10)

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME gam Cyg SNR SNR 20 20 17.100 +40 26 09.00           ~ 247 2
2 PSR J2021+4026 Psr 20 21 30.496 +40 26 53.56           ~ 300 2

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