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


Autoria(s): Arqueros Martínez, Fernando; Cortina, J.; Fernández, J.; Fonseca González, Mª Victoria; González, J. G.; Martínez, S.; Mirzoyan, R.; Moralejo, A.; Padilla, L.; Sánchez, J. A.
Data(s)

01/10/1996

Resumo

Data from the HEGRA air shower array are used to set an upper limit on the emission of gamma-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). 10^-13 cm^-2 sec^-1. The shock front of SNR G78.2 + 2.1 probably recently overtook the molecular cloud Gong 8 which then acts as a target for the cosmic rays produced within the SNR, thus leading to the expectation of enhanced gamma-radiation. Using a model of Drury, Aharonian and Völk which assumes that SNRs are the sources of galactic cosmic rays via first order Fermi acceleration, we calculated a theoretical prediction for the gamma-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 gamma-ray energies above 25 TeV. Possible reasons for this discrepancy are discussed.

Formato

application/pdf

Identificador

http://eprints.ucm.es/38102/1/FS%C3%A1nchez%20P%2001%20LIBRE.pdf

Idioma(s)

en

Publicador

EDP Sciencies

Relação

http://eprints.ucm.es/38102/

Direitos

info:eu-repo/semantics/openAccess

Palavras-Chave #Física de materiales
Tipo

info:eu-repo/semantics/article

PeerReviewed