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          Institute: MPI für extraterrestrische Physik     Collection: High Energy Astrophysics at MPE     Display Documents

ID: 5900.0, MPI für extraterrestrische Physik / High Energy Astrophysics at MPE
COMPTEL observations of the gamma-ray blazar PKS 1622-297
Authors:Zhang, S.; Collmar, W.; Bennett, K.; Bloemen, H.; Hermsen, W.; McConnell, M.; Reimer, O.; Schönfelder, V.; Wagner, S. J.; Williams, O. R.
Date of Publication (YYYY-MM-DD):2002-05
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Issue / Number:3
Start Page:843
End Page:853
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We report results of observations and analyses on the gamma-ray blazar PKS 1622-297, with emphasis on the COMPTEL data (0.75-30 MeV) collected between April 1991 and November 1997. PKS 1622- 297 was detected as a source of gamma-rays by the EGRET experiment aboard CGRO in 1995 during a gamma-ray outburst at energies above 100 MeV lasting for five weeks. In this time period the blazar was significantly (similar to 5.9 sigma) detected by COMPTEL at 10{30 MeV. At lower COMPTEL energies the detection is marginal, resulting in a hard MeV spectrum. The combined COMPTEL/EGRET energy spectrum shows a break at MeV energies. The broad-band spectrum (radio {-gamma-rays) shows that the gamma-ray emission dominates the overall power output. On top of the 5-week gamma-ray outburst, EGRET detected a huge are lasting for >1 day. Enhanced MeV emission (10-30 MeV) is found near the time of this are, suggesting a possible time delay with respect to the emission above 100 MeV. Outside the 5-week flaring period in 1995, we do not detect MeV emission from PKS 1622-29
Free Keywords:gamma rays : observations; galaxies : active; galaxies : quasars : individual : PKS 1622-297
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für extraterrestrische Physik
External Affiliations:Max Planck Inst Extraterr Phys, POB 1603, D-85740 Garching,; Germany; Max Planck Inst Extraterr Phys, D-85740 Garching, Germany; SRON, Natl Inst Space Res, NL-3584 CA Utrecht, Netherlands; Univ New Hampshire, Inst Study Earth Oceans & Space, Durham, NH 03824 USA; European Space Agcy, Dept Space Sci, Div Astrophys, ESTEC, NL-2200 AG Noordwijk, Netherlands; NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA; Inst High Energy Phys, Lab Cosm Ray & High Energy Astrophys, Beijing 100039, Peoples R China; Landessternwarte Heidelberg, D-69117 Heidelberg, Germa
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