Detection of gamma-ray emission from the quasar PKS 0208-512

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. Schneid; P. Sreekumar; D. J. Thompson

doi:10.1086/186756

Detection of gamma-ray emission from the quasar PKS 0208-512

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. 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

30 Citations (Scopus)

Abstract

High-energy gamma-ray emission has been detected from the quasar PKS 0208-512 in the energy range above 30 MeV by the Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory. This region of sky was observed in five different viewing periods, and evidence of time variability in the gamma-ray emission by more than a factor of 3 was found. At the maximum intensity between 1991 September 19 and October 3, the flux density above 100 MeV was (9.1 ± 0.4) × 10^-7γ cm^-2 s^-1. The photon spectrum during this period may be expressed as a power law with an exponent of -1.69 ± 0.05 between 30 MeV and 4 GeV. This is the hardest quasar spectrum observed by EGRET up to the present time.

Original language	English
Pages (from-to)	L21-L24
Journal	Astrophysical Journal
Volume	405
Issue number	1 PART 2
DOIs	https://doi.org/10.1086/186756
Publication status	Published - 01-03-1993

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1086/186756

Cite this

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., Sreekumar, P., & Thompson, D. J. (1993). Detection of gamma-ray emission from the quasar PKS 0208-512. Astrophysical Journal, 405(1 PART 2), L21-L24. https://doi.org/10.1086/186756

@article{e039ca67929147978367fe395ad6c725,

title = "Detection of gamma-ray emission from the quasar PKS 0208-512",

abstract = "High-energy gamma-ray emission has been detected from the quasar PKS 0208-512 in the energy range above 30 MeV by the Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory. This region of sky was observed in five different viewing periods, and evidence of time variability in the gamma-ray emission by more than a factor of 3 was found. At the maximum intensity between 1991 September 19 and October 3, the flux density above 100 MeV was (9.1 ± 0.4) × 10-7γ cm-2 s-1. The photon spectrum during this period may be expressed as a power law with an exponent of -1.69 ± 0.05 between 30 MeV and 4 GeV. This is the hardest quasar spectrum observed by EGRET up to the present time.",

author = "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 E. Schneid and P. Sreekumar and Thompson, \{D. J.\}",

year = "1993",

month = mar,

day = "1",

doi = "10.1086/186756",

language = "English",

volume = "405",

pages = "L21--L24",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1 PART 2",

}

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, E, Sreekumar, P & Thompson, DJ 1993, 'Detection of gamma-ray emission from the quasar PKS 0208-512', Astrophysical Journal, vol. 405, no. 1 PART 2, pp. L21-L24. https://doi.org/10.1086/186756

TY - JOUR

T1 - Detection of gamma-ray emission from the quasar PKS 0208-512

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.

AU - Sreekumar, P.

AU - Thompson, D. J.

PY - 1993/3/1

Y1 - 1993/3/1

N2 - High-energy gamma-ray emission has been detected from the quasar PKS 0208-512 in the energy range above 30 MeV by the Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory. This region of sky was observed in five different viewing periods, and evidence of time variability in the gamma-ray emission by more than a factor of 3 was found. At the maximum intensity between 1991 September 19 and October 3, the flux density above 100 MeV was (9.1 ± 0.4) × 10-7γ cm-2 s-1. The photon spectrum during this period may be expressed as a power law with an exponent of -1.69 ± 0.05 between 30 MeV and 4 GeV. This is the hardest quasar spectrum observed by EGRET up to the present time.

AB - High-energy gamma-ray emission has been detected from the quasar PKS 0208-512 in the energy range above 30 MeV by the Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory. This region of sky was observed in five different viewing periods, and evidence of time variability in the gamma-ray emission by more than a factor of 3 was found. At the maximum intensity between 1991 September 19 and October 3, the flux density above 100 MeV was (9.1 ± 0.4) × 10-7γ cm-2 s-1. The photon spectrum during this period may be expressed as a power law with an exponent of -1.69 ± 0.05 between 30 MeV and 4 GeV. This is the hardest quasar spectrum observed by EGRET up to the present time.

UR - https://www.scopus.com/pages/publications/12044259671

UR - https://www.scopus.com/pages/publications/12044259671#tab=citedBy

U2 - 10.1086/186756

DO - 10.1086/186756

M3 - Article

AN - SCOPUS:12044259671

SN - 0004-637X

VL - 405

SP - L21-L24

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 PART 2

ER -

Detection of gamma-ray emission from the quasar PKS 0208-512

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this