A Multi-frequency campaign on the gamma-ray loud blazar W Comae
M. Maisack, K. Mannheim, R. D. Geckeler, M. Hillas, S. Katajainen, F. Marshall, D. Petry, C. v. Montigny, G. Paubert, J. Rose, A. Sillanpaeae, L. O. Takalo, H. Teraesranta
Abstract
We report preliminary results of a multi-frequency campaign on the TeV candidate blazar W Comae (z=0.102). Flux limits by Whipple and HEGRA show that the TeV flux must be considerably below an E-2 extrapolation of the EGRET flux. In the framework of proton-initiated cascade models, this implies a moderate amount of gamma-ray attenuation due to pair production in collisions with low-energy photons of the extragalactic infrared background. In a simple SSC model, the gamma-ray spectrum cuts off intrinsically just below TeV without requiring external absorption.
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