Constraints on the cosmic rays in the small magellanic cloud

P. Sreekumar; D. L. Bertsch; B. L. Dingus; C. E. Fichtel; R. C. Hartman; S. D. Hunter; G. Kanbach; D. A. Kniffen; Y. C. Lin; J. R. Mattox; H. A. Mayer-Hasselwander; P. F. Michelson; C. Von Montigny; P. L. Nolan; K. Pinkau; E. J. Schneid; R. G. Stone; D. J. Thompson

doi:10.1103/PhysRevLett.70.127

Constraints on the cosmic rays in the small magellanic cloud

P. Sreekumar^*, D. L. Bertsch, B. L. Dingus, C. E. Fichtel, R. C. Hartman, S. D. Hunter, G. Kanbach, D. A. Kniffen, Y. C. Lin, J. R. Mattox, H. A. Mayer-Hasselwander, P. F. Michelson, C. Von Montigny, P. L. Nolan, K. Pinkau, E. J. Schneid, R. G. Stone, D. J. Thompson

^*Corresponding author for this work

Manipal Centre for Natural Sciences, Manipal

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

70 Citations (Scopus)

Abstract

Observations of the Small Magellanic Cloud using the Energetic Gamma Ray Experiment Telescope on the Compton Observatory yield an upper limit (95% confidence) for gamma-ray emission >100 MeV of 0.5×10-7 photon/cm2 s. The expected flux if the cosmic rays are universal rather than galactic in origin, is (2.4-0.5)×10-7 photon/cm2 s, only a third of which arise from cosmic ray electron interactions. Hence, the bulk of the cosmic ray energy density is almost certainly not metagalactic, and therefore galactic in origin.

Original language	English
Pages (from-to)	127-129
Number of pages	3
Journal	Physical Review Letters
Volume	70
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.70.127
Publication status	Published - 1993

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.70.127

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Sreekumar, P., Bertsch, D. L., Dingus, B. L., Fichtel, C. E., Hartman, R. C., Hunter, S. D., Kanbach, G., Kniffen, D. A., Lin, Y. C., Mattox, J. R., Mayer-Hasselwander, H. A., Michelson, P. F., Von Montigny, C., Nolan, P. L., Pinkau, K., Schneid, E. J., Stone, R. G., & Thompson, D. J. (1993). Constraints on the cosmic rays in the small magellanic cloud. Physical Review Letters, 70(2), 127-129. https://doi.org/10.1103/PhysRevLett.70.127

@article{ac6e457b87d64c2993ef17fc511e633d,

title = "Constraints on the cosmic rays in the small magellanic cloud",

abstract = "Observations of the Small Magellanic Cloud using the Energetic Gamma Ray Experiment Telescope on the Compton Observatory yield an upper limit (95\% confidence) for gamma-ray emission >100 MeV of 0.5×10-7 photon/cm2 s. The expected flux if the cosmic rays are universal rather than galactic in origin, is (2.4-0.5)×10-7 photon/cm2 s, only a third of which arise from cosmic ray electron interactions. Hence, the bulk of the cosmic ray energy density is almost certainly not metagalactic, and therefore galactic in origin.",

author = "P. Sreekumar and Bertsch, \{D. L.\} and Dingus, \{B. L.\} and Fichtel, \{C. E.\} and Hartman, \{R. C.\} and Hunter, \{S. D.\} and G. Kanbach and Kniffen, \{D. A.\} and Lin, \{Y. C.\} and Mattox, \{J. R.\} and Mayer-Hasselwander, \{H. A.\} and Michelson, \{P. F.\} and \{Von Montigny\}, C. and Nolan, \{P. L.\} and K. Pinkau and Schneid, \{E. J.\} and Stone, \{R. G.\} and Thompson, \{D. J.\}",

year = "1993",

doi = "10.1103/PhysRevLett.70.127",

language = "English",

volume = "70",

pages = "127--129",

journal = "Physical Review Letters",

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Sreekumar, P, Bertsch, DL, Dingus, BL, Fichtel, CE, Hartman, RC, Hunter, SD, Kanbach, G, Kniffen, DA, Lin, YC, Mattox, JR, Mayer-Hasselwander, HA, Michelson, PF, Von Montigny, C, Nolan, PL, Pinkau, K, Schneid, EJ, Stone, RG & Thompson, DJ 1993, 'Constraints on the cosmic rays in the small magellanic cloud', Physical Review Letters, vol. 70, no. 2, pp. 127-129. https://doi.org/10.1103/PhysRevLett.70.127

TY - JOUR

T1 - Constraints on the cosmic rays in the small magellanic cloud

AU - Sreekumar, P.

AU - Bertsch, D. L.

AU - Dingus, B. L.

AU - Fichtel, C. E.

AU - Hartman, R. C.

AU - Hunter, S. D.

AU - Kanbach, G.

AU - Kniffen, D. A.

AU - Lin, Y. C.

AU - Mattox, J. R.

AU - Mayer-Hasselwander, H. A.

AU - Michelson, P. F.

AU - Von Montigny, C.

AU - Nolan, P. L.

AU - Pinkau, K.

AU - Schneid, E. J.

AU - Stone, R. G.

AU - Thompson, D. J.

PY - 1993

Y1 - 1993

N2 - Observations of the Small Magellanic Cloud using the Energetic Gamma Ray Experiment Telescope on the Compton Observatory yield an upper limit (95% confidence) for gamma-ray emission >100 MeV of 0.5×10-7 photon/cm2 s. The expected flux if the cosmic rays are universal rather than galactic in origin, is (2.4-0.5)×10-7 photon/cm2 s, only a third of which arise from cosmic ray electron interactions. Hence, the bulk of the cosmic ray energy density is almost certainly not metagalactic, and therefore galactic in origin.

AB - Observations of the Small Magellanic Cloud using the Energetic Gamma Ray Experiment Telescope on the Compton Observatory yield an upper limit (95% confidence) for gamma-ray emission >100 MeV of 0.5×10-7 photon/cm2 s. The expected flux if the cosmic rays are universal rather than galactic in origin, is (2.4-0.5)×10-7 photon/cm2 s, only a third of which arise from cosmic ray electron interactions. Hence, the bulk of the cosmic ray energy density is almost certainly not metagalactic, and therefore galactic in origin.

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JF - Physical Review Letters

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Constraints on the cosmic rays in the small magellanic cloud

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