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COMPTEL Observations of the Gamma-Ray Blazar PKS 1622-297 | | S. Zhang
; W. Collmar
; K. Bennett
; H. Bloemen
; W. Hermsen
; M. McConnell
; O. Reimer
; V. Schonfelder
; S. J. Wagner
; O.R. Williams
; | | Date: |
14 Mar 2002 | | Subject: | astro-ph | | Abstract: | 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 (~ 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 flare lasting for > 1 day. Enhanced MeV emission (10 - 30 MeV) is found near the time of this flare, 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 1622-297. | | Source: | arXiv, astro-ph/0203231 | | Services: | Forum | Review | PDF | Favorites | |
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