Time variability in the gamma-ray emission of 3C 279

D. A. Kniffen; D. L. Bertsch; C. E. Fichtel; R. C. Hartman; S. D. Hunter; G. Kanbach; P. W. Kwok; Y. C. Lin; 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:10.1086/172813

Time variability in the gamma-ray emission of 3C 279

D. A. Kniffen^*, D. L. Bertsch, C. E. Fichtel, R. C. Hartman, S. D. Hunter, G. Kanbach, P. W. Kwok, Y. C. Lin, 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

131 Citations (Scopus)

Abstract

Following the initial detection of 3C 279 as an intense high-energy gamma-ray emitter during a 1991 June 16-28 observation, the EGRET instrument on the Compton Gamma Ray Observatory made a second observation during 1991 October 3-17. Low-sensitivity observations were also made during 1991 October 12-31 and 1992 April. The relatively intense June fluxes allowed the time structure to be determined down to the level of half-days. During this period a flux enhancement of about a factor of 4 is seen, lasting several days. The October exposures show fluxes somewhat below the minimum June flux, with no significant evidence of time variability. The 1992 April fluxes are well off the main instrument axis, and so the statistics are less compelling, but the evidence appears to show additional time variability. The observations are consistent with a model in which the gamma rays result from Compton scattering of low-energy photons by relativistic electrons in a jet.

Original language	English
Pages (from-to)	133-136
Number of pages	4
Journal	Astrophysical Journal
Volume	411
Issue number	1
DOIs	https://doi.org/10.1086/172813
Publication status	Published - 01-07-1993

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/172813

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Kniffen, D. A., Bertsch, D. L., Fichtel, C. E., Hartman, R. C., Hunter, S. D., Kanbach, G., Kwok, P. W., Lin, Y. C., 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. (1993). Time variability in the gamma-ray emission of 3C 279. Astrophysical Journal, 411(1), 133-136. https://doi.org/10.1086/172813

@article{7f77a593333f4a9cbc091519604a8f58,

title = "Time variability in the gamma-ray emission of 3C 279",

abstract = "Following the initial detection of 3C 279 as an intense high-energy gamma-ray emitter during a 1991 June 16-28 observation, the EGRET instrument on the Compton Gamma Ray Observatory made a second observation during 1991 October 3-17. Low-sensitivity observations were also made during 1991 October 12-31 and 1992 April. The relatively intense June fluxes allowed the time structure to be determined down to the level of half-days. During this period a flux enhancement of about a factor of 4 is seen, lasting several days. The October exposures show fluxes somewhat below the minimum June flux, with no significant evidence of time variability. The 1992 April fluxes are well off the main instrument axis, and so the statistics are less compelling, but the evidence appears to show additional time variability. The observations are consistent with a model in which the gamma rays result from Compton scattering of low-energy photons by relativistic electrons in a jet.",

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

year = "1993",

month = jul,

day = "1",

doi = "10.1086/172813",

language = "English",

volume = "411",

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journal = "Astrophysical Journal",

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publisher = "American Astronomical Society",

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Kniffen, DA, Bertsch, DL, Fichtel, CE, Hartman, RC, Hunter, SD, Kanbach, G, Kwok, PW, Lin, YC, Mattox, JR, Mayer-Hasselwander, HA, Michelson, PF, Von Montigny, C, Nolan, PL, Pinkau, K, Schneid, E, Sreekumar, P & Thompson, DJ 1993, 'Time variability in the gamma-ray emission of 3C 279', Astrophysical Journal, vol. 411, no. 1, pp. 133-136. https://doi.org/10.1086/172813

TY - JOUR

T1 - Time variability in the gamma-ray emission of 3C 279

AU - Kniffen, D. A.

AU - Bertsch, D. L.

AU - Fichtel, C. E.

AU - Hartman, R. C.

AU - Hunter, S. D.

AU - Kanbach, G.

AU - Kwok, P. W.

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.

AU - Sreekumar, P.

AU - Thompson, D. J.

PY - 1993/7/1

Y1 - 1993/7/1

N2 - Following the initial detection of 3C 279 as an intense high-energy gamma-ray emitter during a 1991 June 16-28 observation, the EGRET instrument on the Compton Gamma Ray Observatory made a second observation during 1991 October 3-17. Low-sensitivity observations were also made during 1991 October 12-31 and 1992 April. The relatively intense June fluxes allowed the time structure to be determined down to the level of half-days. During this period a flux enhancement of about a factor of 4 is seen, lasting several days. The October exposures show fluxes somewhat below the minimum June flux, with no significant evidence of time variability. The 1992 April fluxes are well off the main instrument axis, and so the statistics are less compelling, but the evidence appears to show additional time variability. The observations are consistent with a model in which the gamma rays result from Compton scattering of low-energy photons by relativistic electrons in a jet.

AB - Following the initial detection of 3C 279 as an intense high-energy gamma-ray emitter during a 1991 June 16-28 observation, the EGRET instrument on the Compton Gamma Ray Observatory made a second observation during 1991 October 3-17. Low-sensitivity observations were also made during 1991 October 12-31 and 1992 April. The relatively intense June fluxes allowed the time structure to be determined down to the level of half-days. During this period a flux enhancement of about a factor of 4 is seen, lasting several days. The October exposures show fluxes somewhat below the minimum June flux, with no significant evidence of time variability. The 1992 April fluxes are well off the main instrument axis, and so the statistics are less compelling, but the evidence appears to show additional time variability. The observations are consistent with a model in which the gamma rays result from Compton scattering of low-energy photons by relativistic electrons in a jet.

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SP - 133

EP - 136

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

Time variability in the gamma-ray emission of 3C 279

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