DETECTION OF GAMMA-RAY EMISSION FROM THE QUASAR PKS 0208-512

被引：41
|
作者：
BERTSCH, DL
DINGUS, BL
FICHTEL, CE
HARTMAN, RC
HUNTER, SD
KANBACH, G
KNIFFEN, DA
LIN, YC
MATTOX, JR
MAYERHASSELWANDER, HA
MICHELSON, PF
VONMONTIGNY, C
NOLAN, PL
PINKAU, K
SCHNEID, E
SREEKUMAR, P
THOMPSON, DJ
机构：
[1] MAX PLANCK INST EXTRATERR PHYS,W-8046 GARCHING,GERMANY
[2] HAMPDEN SYDNEY COLL,HAMPDEN SYDNEY,VA 23943
[3] STANFORD UNIV,HANSEN EXPTL PHYS LAB,STANFORD,CA 94305
[4] COMP SCI CORP,ASTRON PROGRAM,COMPTON OBSERV SCI SUPPORT CTR,LOS ANGELES,CA 90045
[5] GRUMMAN AEROSP CORP,BETHPAGE,NY 11714
来源：
ASTROPHYSICAL JOURNAL | 1993年 / 405卷 / 01期
关键词：
GALAXIES; ACTIVE; GAMMA-RAYS; OBSERVATIONS; QUASARS; INDIVIDUAL; (PKS; 0208; 512);
D O I：
10.1086/186756
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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) x 10(-7)gamma 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.
引用
收藏
页码：L21 / L24
页数：4
相关论文
共 50 条
  • [21] Detection of polarized gamma-ray emission from the Crab nebula with the Hitomi Soft Gamma-ray Detector
    Aharonian, Felix
    Akamatsu, Hiroki
    Akimoto, Fumie
    Allen, Steven W.
    Angelini, Lorella
    Audard, Marc
    Awaki, Hisamitsu
    Axelsson, Magnus
    Bamba, Aya
    Bautz, Marshall W.
    Blandford, Roger
    Brenneman, Laura W.
    Brown, Gregory V.
    Bulbul, Esra
    Cackett, Edward M.
    Chernyakova, Maria
    Chiao, Meng P.
    Coppi, Paolo S.
    Costantini, Elisa
    de Plaa, Jelle
    de Vries, Cor P.
    den Herder, Jan-Willem
    Done, Chris
    Dotani, Tadayasu
    Ebisawa, Ken
    Eckart, Megan E.
    Enoto, Teruaki
    Ezoe, Yuichiro
    Fabian, Andrew C.
    Ferrigno, Carlo
    Foster, Adam R.
    Fujimoto, Ryuichi
    Fukazawa, Yasushi
    Furuzawa, Akihiro
    Galeazzi, Massimiliano
    Gallo, Luigi C.
    Gandhi, Poshak
    Giustini, Margherita
    Goldwurm, Andrea
    Gu, Liyi
    Guainazzi, Matteo
    Haba, Yoshito
    Hagino, Kouichi
    Hamaguchi, Kenji
    Harrus, Ilana M.
    Hatsukade, Isamu
    Hayashi, Katsuhiro
    Hayashi, Takayuki
    Hayashida, Kiyoshi
    Hiraga, Junko S.
    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2018, 70 (06)
  • [22] Fermi/LAT detection of extraordinary variability in the gamma-ray emission of the blazar PKS 1510-089
    Foschini, L.
    Bonnoli, G.
    Ghisellini, G.
    Tagliaferri, G.
    Tavecchio, F.
    Stamerra, A.
    Astronomy and Astrophysics, 2013, 555
  • [23] GAMMA-RAY QUASAR COULD BE A SHOCK
    THOMSEN, DE
    SCIENCE NEWS, 1983, 124 (11) : 167 - 167
  • [24] A gamma-ray flare from PKS 2255-282
    Macomb, DJ
    Gehrels, N
    Shrader, CR
    ASTROPHYSICAL JOURNAL, 1999, 513 (02): : 652 - 655
  • [25] A statistical detection of gamma-ray emission from galaxy clusters: Implications for the gamma-ray background and structure formation
    Scharf, CA
    Mukherjee, R
    ASTROPHYSICAL JOURNAL, 2002, 580 (01): : 154 - 163
  • [26] Multiwavelength observations of the powerful gamma-ray quasar PKS 1510-089: Clues on the jet composition
    Kataoka, J.
    Madejski, G.
    Sikora, M.
    Roming, P.
    Chester, M. M.
    Grupe, D.
    Tsubuku, Y.
    Sato, R.
    Kawai, N.
    Tosti, G.
    Impiombato, D.
    Kovalev, Y. Y.
    Kovalev, Y. A.
    Edwards, P. G.
    Wagner, S. J.
    Moderski, R.
    Stawarz, L.
    Takahashi, T.
    Watanabe, S.
    ASTROPHYSICAL JOURNAL, 2008, 672 (02): : 787 - 799
  • [27] The large gamma-ray flare of the flat-spectrum radio quasar PKS0346-27
    Angioni, R.
    Nesci, R.
    Finke, J. D.
    Buson, S.
    Ciprini, S.
    ASTRONOMY & ASTROPHYSICS, 2019, 627
  • [28] GAMMA-RAY EMISSION FROM PULSARS
    HARDING, AK
    ANNALS OF THE NEW YORK ACADEMY OF SCIENCES, 1993, 688 : 573 - 580
  • [29] GAMMA-RAY EMISSION FROM PULSARS
    BHATIA, VB
    MISHRA, S
    PANCHAPAKESAN, N
    JOURNAL OF ASTROPHYSICS AND ASTRONOMY, 1992, 13 (01) : 53 - 59
  • [30] GAMMA-RAY EMISSION FROM PULSARS
    ZHAO, YH
    LU, T
    HUANG, KL
    LU, JL
    PENG, QH
    ASTRONOMY & ASTROPHYSICS, 1989, 223 (1-2) : 147 - 153
12345