G106.6+2.9 Spectrum

The Boomerang Nebula G106.6+2.9 is one of the candidates for the sources of ultrahigh energy cosmic rays. The source under consideration is a spatially extended system of the pulsar PSR J2229+6114 and the surrounding pulsar wind nebula, which has a characteristic comet-like shape. At present, there are many papers devoted to the spectrum of the tail region of this nebula. However, the head region is also interesting. This topic is not so widely covered. This paper presents the energy spectra of the tail and head regions, discusses a feature in the spectrum of the head region, recorded by the Comptel, EGRET and COS-B experiments.