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

C. Prosch; E. Feigl; R. Plaga; F. Arqueros; J. Cortina; J. Fernandez; P. Fernandez; V. Fonseca; B. Funk; J. C. Gonzalez; V. Haustein; G. Heinzelmann; A. Karle; H. Krawczynski; F. Krennrich; M. Kühn; A. Lindner; E. Lorenz; N. Magnussen; S. Martinez; V. Matheis; M. Merck; H. Meyer; R. Mirzoyan; H. Möller; A. Moralejo; N. Müller; L. Padilla; J. Prahl; W. Rhode; M. Samorski; J. A. Sanchez; H. Sander; D. Schmele; W. Stamm; H. Wahl; S. Westerhoff; B. Wiebel-Sooth; M. Willmer

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

C. Prosch
, E. Feigl
, R. Plaga
, F. Arqueros
, J. Cortina
, J. Fernandez
, P. Fernandez
, V. Fonseca
, B. Funk
, J. C. Gonzalez
, V. Haustein
, G. Heinzelmann
, A. Karle
, H. Krawczynski
, F. Krennrich
, M. Kühn
, A. Lindner
, E. Lorenz
, N. Magnussen
, S. Martinez

V. Matheis, M. Merck, H. Meyer, R. Mirzoyan, H. Möller, A. Moralejo, N. Müller, L. Padilla, J. Prahl, W. Rhode, M. Samorski, J. A. Sanchez, H. Sander, D. Schmele, W. Stamm, H. Wahl, S. Westerhoff, B. Wiebel-Sooth, M. Willmer

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

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)· 10^-13 cm^-2 sec^-1. 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 Volk 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 25 TeV. Possible reasons for this discrepancy are discussed.

Original language	English
Pages (from-to)	275-280
Number of pages	6
Journal	Astronomy and Astrophysics
Volume	314
Issue number	3
State	Published - Oct 1 1996

Keywords

Cosmic rays
Gamma rays: observations
ISM: G 78.2+2.1
ISM: supernova remnants

Cite this

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., Kühn, M., Lindner, A., Lorenz, E., Magnussen, N., ... Willmer, M. (1996). Search for very high energy γ radiation from the radio bright region DR4 of the SNR G78.2+2.1. Astronomy and Astrophysics, 314(3), 275-280.

@article{8967a43749fd4211b08a55c81d27821c,

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

abstract = "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)· 10-13 cm-2 sec-1. 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 Volk 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 25 TeV. Possible reasons for this discrepancy are discussed.",

keywords = "Cosmic rays, Gamma rays: observations, ISM: G 78.2+2.1, ISM: supernova remnants",

author = "C. Prosch and E. Feigl and R. Plaga and F. Arqueros and J. Cortina and J. Fernandez and P. Fernandez and V. Fonseca and B. Funk and Gonzalez, \{J. C.\} and V. Haustein and G. Heinzelmann and A. Karle and H. Krawczynski and F. Krennrich and M. K{\"u}hn and A. Lindner and E. Lorenz and N. Magnussen and S. Martinez and V. Matheis and M. Merck and H. Meyer and R. Mirzoyan and H. M{\"o}ller and A. Moralejo and N. M{\"u}ller and L. Padilla and J. Prahl and W. Rhode and M. Samorski and Sanchez, \{J. A.\} and H. Sander and D. Schmele and W. Stamm and H. Wahl and S. Westerhoff and B. Wiebel-Sooth and M. Willmer",

year = "1996",

month = oct,

day = "1",

language = "English",

volume = "314",

pages = "275--280",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

number = "3",

}

Prosch, C, Feigl, E, Plaga, R, Arqueros, F, Cortina, J, Fernandez, J, Fernandez, P, Fonseca, V, Funk, B, Gonzalez, JC, Haustein, V, Heinzelmann, G, Karle, A, Krawczynski, H, Krennrich, F, Kühn, M, Lindner, A, Lorenz, E, Magnussen, N, Martinez, S, Matheis, V, Merck, M, Meyer, H, Mirzoyan, R, Möller, H, Moralejo, A, Müller, N, Padilla, L, Prahl, J, Rhode, W, Samorski, M, Sanchez, JA, Sander, H, Schmele, D, Stamm, W, Wahl, H, Westerhoff, S, Wiebel-Sooth, B & Willmer, M 1996, 'Search for very high energy γ radiation from the radio bright region DR4 of the SNR G78.2+2.1', Astronomy and Astrophysics, vol. 314, no. 3, pp. 275-280.

TY - JOUR

T1 - Search for very high energy γ radiation from the radio bright region DR4 of the SNR G78.2+2.1

AU - Prosch, C.

AU - Feigl, E.

AU - Plaga, R.

AU - Arqueros, F.

AU - Cortina, J.

AU - Fernandez, J.

AU - Fernandez, P.

AU - Fonseca, V.

AU - Funk, B.

AU - Gonzalez, J. C.

AU - Haustein, V.

AU - Heinzelmann, G.

AU - Karle, A.

AU - Krawczynski, H.

AU - Krennrich, F.

AU - Kühn, M.

AU - Lindner, A.

AU - Lorenz, E.

AU - Magnussen, N.

AU - Martinez, S.

AU - Matheis, V.

AU - Merck, M.

AU - Meyer, H.

AU - Mirzoyan, R.

AU - Möller, H.

AU - Moralejo, A.

AU - Müller, N.

AU - Padilla, L.

AU - Prahl, J.

AU - Rhode, W.

AU - Samorski, M.

AU - Sanchez, J. A.

AU - Sander, H.

AU - Schmele, D.

AU - Stamm, W.

AU - Wahl, H.

AU - Westerhoff, S.

AU - Wiebel-Sooth, B.

AU - Willmer, M.

PY - 1996/10/1

Y1 - 1996/10/1

N2 - 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)· 10-13 cm-2 sec-1. 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 Volk 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 25 TeV. Possible reasons for this discrepancy are discussed.

AB - 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)· 10-13 cm-2 sec-1. 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 Volk 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 25 TeV. Possible reasons for this discrepancy are discussed.

KW - Cosmic rays

KW - Gamma rays: observations

KW - ISM: G 78.2+2.1

KW - ISM: supernova remnants

UR - https://www.scopus.com/pages/publications/0000877155

M3 - Article

AN - SCOPUS:0000877155

SN - 0004-6361

VL - 314

SP - 275

EP - 280

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 3

ER -

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

Abstract

Keywords

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