Detection of high-energy gamma-ray emission from the BL Lacertae object Markarian 421 by the EGRET telescope on the Compton Observatory

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

doi:10.1086/186671

Detection of high-energy gamma-ray emission from the BL Lacertae object Markarian 421 by the EGRET telescope on the Compton Observatory

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

^*Corresponding author for this work

Manipal Centre for Natural Sciences, Manipal

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

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Abstract

Gamma radiation in the energy range from 50 MeV to well over 1 GeV has been observed from the direction of the BL Lac object Markarian 421 by the Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Observatory during the period 1991 June 27-July 11. The source flux is weak, but still statistically significant at the level of 10^-5; the integrated photon flux above 100 MeV is (1.4 ± 0.3) × 10^-7 cm^-2 s^-1. The differential photon energy spectrum can be represented by a power law with exponent 1.96 ± 0.14. This is the first detection of gamma-ray emission from a BL Lac object.

Original language	English
Pages (from-to)	L61-L64
Journal	Astrophysical Journal
Volume	401
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/186671
Publication status	Published - 20-12-1992

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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Lin, Y. C., Bertsch, D. L., Chiang, J., Fichtel, C. E., Hartman, R. C., Hunter, S. D., Kanbach, G., Kniffen, D. A., Kwok, P. W., Mattox, J. R., Mayer-Hasselwander, H. A., Michelson, P. F., Von Montigny, C., Nolan, P. L., Pinkau, K., Schneid, E., Sreekumar, P., & Thompson, D. J. (1992). Detection of high-energy gamma-ray emission from the BL Lacertae object Markarian 421 by the EGRET telescope on the Compton Observatory. Astrophysical Journal, 401(2 PART 2), L61-L64. https://doi.org/10.1086/186671

@article{8e287bb1015249bc8a33f7bc09c1c64c,

title = "Detection of high-energy gamma-ray emission from the BL Lacertae object Markarian 421 by the EGRET telescope on the Compton Observatory",

abstract = "Gamma radiation in the energy range from 50 MeV to well over 1 GeV has been observed from the direction of the BL Lac object Markarian 421 by the Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Observatory during the period 1991 June 27-July 11. The source flux is weak, but still statistically significant at the level of 10-5; the integrated photon flux above 100 MeV is (1.4 ± 0.3) × 10-7 cm-2 s-1. The differential photon energy spectrum can be represented by a power law with exponent 1.96 ± 0.14. This is the first detection of gamma-ray emission from a BL Lac object.",

author = "Lin, \{Y. C.\} and Bertsch, \{D. L.\} and J. Chiang and Fichtel, \{C. E.\} and Hartman, \{R. C.\} and Hunter, \{S. D.\} and G. Kanbach and Kniffen, \{D. A.\} and Kwok, \{P. W.\} 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 E. Schneid and P. Sreekumar and Thompson, \{D. J.\}",

year = "1992",

month = dec,

day = "20",

doi = "10.1086/186671",

language = "English",

volume = "401",

pages = "L61--L64",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2 PART 2",

}

Lin, YC, Bertsch, DL, Chiang, J, Fichtel, CE, Hartman, RC, Hunter, SD, Kanbach, G, Kniffen, DA, Kwok, PW, Mattox, JR, Mayer-Hasselwander, HA, Michelson, PF, Von Montigny, C, Nolan, PL, Pinkau, K, Schneid, E, Sreekumar, P & Thompson, DJ 1992, 'Detection of high-energy gamma-ray emission from the BL Lacertae object Markarian 421 by the EGRET telescope on the Compton Observatory', Astrophysical Journal, vol. 401, no. 2 PART 2, pp. L61-L64. https://doi.org/10.1086/186671

TY - JOUR

T1 - Detection of high-energy gamma-ray emission from the BL Lacertae object Markarian 421 by the EGRET telescope on the Compton Observatory

AU - Lin, Y. C.

AU - Bertsch, D. L.

AU - Chiang, J.

AU - Fichtel, C. E.

AU - Hartman, R. C.

AU - Hunter, S. D.

AU - Kanbach, G.

AU - Kniffen, D. A.

AU - Kwok, P. W.

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.

AU - Sreekumar, P.

AU - Thompson, D. J.

PY - 1992/12/20

Y1 - 1992/12/20

N2 - Gamma radiation in the energy range from 50 MeV to well over 1 GeV has been observed from the direction of the BL Lac object Markarian 421 by the Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Observatory during the period 1991 June 27-July 11. The source flux is weak, but still statistically significant at the level of 10-5; the integrated photon flux above 100 MeV is (1.4 ± 0.3) × 10-7 cm-2 s-1. The differential photon energy spectrum can be represented by a power law with exponent 1.96 ± 0.14. This is the first detection of gamma-ray emission from a BL Lac object.

AB - Gamma radiation in the energy range from 50 MeV to well over 1 GeV has been observed from the direction of the BL Lac object Markarian 421 by the Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Observatory during the period 1991 June 27-July 11. The source flux is weak, but still statistically significant at the level of 10-5; the integrated photon flux above 100 MeV is (1.4 ± 0.3) × 10-7 cm-2 s-1. The differential photon energy spectrum can be represented by a power law with exponent 1.96 ± 0.14. This is the first detection of gamma-ray emission from a BL Lac object.

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DO - 10.1086/186671

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AN - SCOPUS:11944257133

SN - 0004-637X

VL - 401

SP - L61-L64

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 PART 2

ER -

Detection of high-energy gamma-ray emission from the BL Lacertae object Markarian 421 by the EGRET telescope on the Compton Observatory

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