COMPTEL detection of the high-energy gamma-ray source 2CG 135+01

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dc.creatorvan Dijk, R.
dc.creatorBennett, K.
dc.creatorBloemen, H.
dc.creatorCollmar, W.
dc.creatorConnors, A.
dc.creatorDiehl, R.
dc.creatorHermsen, W.
dc.creatorLichti, G. G.
dc.creatorMcConnell, M.
dc.creatorMuch, R.
dc.creatorSchoenfelder, V.
dc.creatorSteinle, H.
dc.creatorStrong, A.
dc.creatorTavani, M.
dc.date1996-04-23
dc.date.accessioned2026-07-25T12:48:11Z
dc.descriptionWe present an analysis of COMPTEL observations made between November 1991 and May 1994 of 2CG 135+01, a bright gamma-ray source located near the Galactic plane. At energies above 1 MeV, an excess consistent with the position of 2CG 135+01 is detected in the sum of the observations, at flux levels which are a factor of 10-100 below those published in the past. The detection significance of this excess, when the possible presence of underlying Galactic diffuse emission is neglected, is 6.6 sigma for 3 degrees of freedom. The differential photon spectrum in the 1-30 MeV energy range can be described by a power law with a spectral index of $1.95^{+0.2}_{-0.3}$. Due to the uncertainties involved in modelling the Galactic-disk diffuse emission underneath the source, the absolute flux levels must be considered uncertain by a factor of two. They are consistent with the extrapolation of the time-averaged spectrum of 2CG 135+01 measured with EGRET, thereby strengthening the identification. No significant temporal correlation between the gamma-ray emission and the monitored radio emission of the possible counterpart radio source GT 0236+610 (showing a 26.5 day modulation) is found.
dc.description9 pages, uses l-aa.sty, five postscript figures included. Also obtainable as postscript file at ftp://estsa2.estec.esa.nl/pub/sciproj/rvdijk_etal_AaA_23_04_96.ps.gz Accepted for publication in A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/9604136
dc.identifierhttp://arxiv.org/abs/astro-ph/9604136
dc.identifier.urihttps://dspace.dare.co.zw/handle/123456789/11923
dc.subjectAstrophysics
dc.titleCOMPTEL detection of the high-energy gamma-ray source 2CG 135+01
dc.typetext

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