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

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dc.creatorCollmar, W.
dc.creatorBennett, K.
dc.creatorBloemen, H.
dc.creatorHermsen, W.
dc.creatorRyan, J.
dc.creatorSchoenfelder, V.
dc.creatorSteinle, H.
dc.creatorWilliams, O. R.
dc.date1999-12-02
dc.date.accessioned2026-07-07T02:34:45Z
dc.date.available2026-07-07T02:34:45Z
dc.descriptionThe 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.
dc.description4 pages including 4 figures, latex2e, appeared in: 'Proc. of 26th ICRC', Salt Lake City, USA
dc.identifierhttps://arxiv.org/abs/astro-ph/9912042
dc.identifierhttp://arxiv.org/abs/astro-ph/9912042
dc.identifier'Proceedings of 26th ICRC', Vol. 3, 374 (1999); eds. D. Kieda, M. Salamon, B. Dingus, Salt Lake City, USA
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/15367
dc.subjectAstrophysics
dc.titleCOMPTEL MeV Observations of the TeV Sources Markarian 421 and Markarian 501
dc.typetext

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