Detection of high-energy gamma rays from quasar PKS 0528+134 by EGRET on the compton gamma ray observatory

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

doi:10.1086/172648

Detection of high-energy gamma rays from quasar PKS 0528+134 by EGRET on the compton gamma ray observatory

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

M. Sommer, P. Sreekumar, D. J. Thompson

^*Corresponding author for this work

Manipal Centre for Natural Sciences, Manipal

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

66 Citations (Scopus)

Abstract

The first several pointing directions of the Compton Gamma Ray Observatory, launched on 1991 April 5, were toward the Galactic anticenter. In addition to the known gamma-ray sources, Crab (PSR 0531 + 21) and Geminga (2CG 195+04), high-energy gamma-ray emission (30 MeV to over 1 GeV) was observed from the quasar PKS 0528 + 134 by the Energetic Gamma Ray Experiment Telescope (EGRET). A redshift measurement, reported here, of 2.07 confirms the identification of this object as a quasar. The differential photon spectrum is well represented by a power law with an exponent of 2.56 + 0.09 and a photon intensity above 100 MeV of (8.4 ± 1.0) × 10^-7 photons cm^-2 s^-1. There is evidence for time variability on a time scale of a few days.

Original language	English
Pages (from-to)	134-138
Number of pages	5
Journal	Astrophysical Journal
Volume	409
Issue number	1
DOIs	https://doi.org/10.1086/172648
Publication status	Published - 1993

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/172648

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Hunter, S. D., Bertsch, D. L., Dingus, B. L., Fichtel, C. E., Hartman, R. C., Kanbach, G., Kniffen, D. A., Kwok, P. W., Lin, Y. C., Mattox, J. R., Mayer-Hasselwander, H. A., Michelson, P. F., Møller, P., Von Montigny, C., Nolan, P. L., Pinkau, K., Radecke, H. D., Rothermel, H., Shaver, P., ... Thompson, D. J. (1993). Detection of high-energy gamma rays from quasar PKS 0528+134 by EGRET on the compton gamma ray observatory. Astrophysical Journal, 409(1), 134-138. https://doi.org/10.1086/172648

@article{2cd7b52d674141069cca26d322effdec,

title = "Detection of high-energy gamma rays from quasar PKS 0528+134 by EGRET on the compton gamma ray observatory",

abstract = "The first several pointing directions of the Compton Gamma Ray Observatory, launched on 1991 April 5, were toward the Galactic anticenter. In addition to the known gamma-ray sources, Crab (PSR 0531 + 21) and Geminga (2CG 195+04), high-energy gamma-ray emission (30 MeV to over 1 GeV) was observed from the quasar PKS 0528 + 134 by the Energetic Gamma Ray Experiment Telescope (EGRET). A redshift measurement, reported here, of 2.07 confirms the identification of this object as a quasar. The differential photon spectrum is well represented by a power law with an exponent of 2.56 + 0.09 and a photon intensity above 100 MeV of (8.4 ± 1.0) × 10-7 photons cm-2 s-1. There is evidence for time variability on a time scale of a few days.",

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

year = "1993",

doi = "10.1086/172648",

language = "English",

volume = "409",

pages = "134--138",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

Hunter, SD, Bertsch, DL, Dingus, BL, Fichtel, CE, Hartman, RC, Kanbach, G, Kniffen, DA, Kwok, PW, Lin, YC, Mattox, JR, Mayer-Hasselwander, HA, Michelson, PF, Møller, P, Von Montigny, C, Nolan, PL, Pinkau, K, Radecke, HD, Rothermel, H, Shaver, P, Schneid, E, Sommer, M, Sreekumar, P & Thompson, DJ 1993, 'Detection of high-energy gamma rays from quasar PKS 0528+134 by EGRET on the compton gamma ray observatory', Astrophysical Journal, vol. 409, no. 1, pp. 134-138. https://doi.org/10.1086/172648

TY - JOUR

T1 - Detection of high-energy gamma rays from quasar PKS 0528+134 by EGRET on the compton gamma ray observatory

AU - Hunter, S. D.

AU - Bertsch, D. L.

AU - Dingus, B. L.

AU - Fichtel, C. E.

AU - Hartman, R. C.

AU - Kanbach, G.

AU - Kniffen, D. A.

AU - Kwok, P. W.

AU - Lin, Y. C.

AU - Mattox, J. R.

AU - Mayer-Hasselwander, H. A.

AU - Michelson, P. F.

AU - Møller, P.

AU - Von Montigny, C.

AU - Nolan, P. L.

AU - Pinkau, K.

AU - Radecke, H. D.

AU - Rothermel, H.

AU - Shaver, P.

AU - Schneid, E.

AU - Sommer, M.

AU - Sreekumar, P.

AU - Thompson, D. J.

PY - 1993

Y1 - 1993

N2 - The first several pointing directions of the Compton Gamma Ray Observatory, launched on 1991 April 5, were toward the Galactic anticenter. In addition to the known gamma-ray sources, Crab (PSR 0531 + 21) and Geminga (2CG 195+04), high-energy gamma-ray emission (30 MeV to over 1 GeV) was observed from the quasar PKS 0528 + 134 by the Energetic Gamma Ray Experiment Telescope (EGRET). A redshift measurement, reported here, of 2.07 confirms the identification of this object as a quasar. The differential photon spectrum is well represented by a power law with an exponent of 2.56 + 0.09 and a photon intensity above 100 MeV of (8.4 ± 1.0) × 10-7 photons cm-2 s-1. There is evidence for time variability on a time scale of a few days.

AB - The first several pointing directions of the Compton Gamma Ray Observatory, launched on 1991 April 5, were toward the Galactic anticenter. In addition to the known gamma-ray sources, Crab (PSR 0531 + 21) and Geminga (2CG 195+04), high-energy gamma-ray emission (30 MeV to over 1 GeV) was observed from the quasar PKS 0528 + 134 by the Energetic Gamma Ray Experiment Telescope (EGRET). A redshift measurement, reported here, of 2.07 confirms the identification of this object as a quasar. The differential photon spectrum is well represented by a power law with an exponent of 2.56 + 0.09 and a photon intensity above 100 MeV of (8.4 ± 1.0) × 10-7 photons cm-2 s-1. There is evidence for time variability on a time scale of a few days.

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DO - 10.1086/172648

M3 - Article

AN - SCOPUS:12044259429

SN - 0004-637X

VL - 409

SP - 134

EP - 138

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

Detection of high-energy gamma rays from quasar PKS 0528+134 by EGRET on the compton gamma ray observatory

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