COMPTEL MeV Observations of the TeV Sources Markarian 421 and Markarian 501

Details COMPTEL MeV Observations of the TeV Sources Markarian 421 and Markarian 501 COMPTEL MeV Observations of the TeV Sources Markarian 421 and Markarian 501

1999-12-02

arxiv.org/abs/astro-ph/9912042v1

'Proceedings of 26th ICRC', Vol. 3, 374 (1999); eds. D. Kieda, M. Salamon, B. Dingus, Salt Lake City, USA

Astronomy and Astrophysics

Astrophysics

4 pages including 4 figures, latex2e, appeared in: 'Proc. of 26th ICRC', Salt Lake City, USA

Scientific paper

The COMPTEL experiment aboard the COMPTON Gamma-Ray Observatory (CGRO) has observed the prominent TeV-blazars Mkn 421 and Mkn 501 many times between the start of its mission in April '91 and December '98. This paper reports first COMPTEL results from mainly time-averaged (CGRO Cycles) data. No evidence for both sources is found up to the end Cycle VI. However, the sum of all 10-30 MeV Cycle VII data shows a weak (3.2 sigma detection) MeV-source being positionally consistent with Mkn 421. During Cycle VII Mkn 421 was rather active at TeV-energies. Due to the lack of other known Gamma-ray sources in this sky region, we consider Mkn 421 as the most likely counterpart for this Gamma-ray emission. However, its connection cannot be proven by COMPTEL.

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