TeV gamma-ray emission from the Cygnus region with Milagro

Document Type

Conference Proceeding

Publication Date



Analysis of diffuse TeV gamma-ray emission can provide clues about the origin of VHE galactic cosmic rays. Previous studies of the galactic diffuse flux with Milagro show an excess of gamma-rays when compared to cosmic ray propagation models in certain regions of the galactic plane. One of these regions is the Cygnus region, which has four known TeV gamma-ray sources in addition to a significant excess of diffuse gamma-rays. In order to better understand this excess, a new analysis technique was used to reconstruct the TeV spectrum of the gamma-rays from the Cygnus region between 1 TeV and 100 TeV for the first time. This technique is based on the fraction of PMTs in the detector that show a significant signal from air shower particles. In this presentation, the analysis technique as well as the resulting spectra in the Cygnus region will be discussed.

Publication Title

Proceedings of the 32nd International Cosmic Ray Conference, ICRC 2011