Detection of TeV Gamma-Ray Emission from the Cygnus Region of the Galaxy with Milagro Using a New Background Rejection Technique

Details Detection of TeV Gamma-Ray Emission from the Cygnus Region of the Galaxy with Milagro Using a New Background Rejection Technique Detection of TeV Gamma-Ray Emission from the Cygnus Region of the Galaxy with Milagro Using a New Background Rejection Technique

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..867..199a&link_type=abstract

CALORIMETRY IN HIGH ENERGY PHYSICS: XII International Conference. AIP Conference Proceedings, Volume 867, pp. 199-208 (2006).

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X- And Gamma-Ray Telescopes And Instrumentation, Neutrino, Muon, Pion, And Other Elementary Particle Detectors, Cosmic Ray Detectors, Extensive Air Showers, Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

Milagro is a TeV gamma-ray observatory that utilizes a large water Cherenkov detector to observe extensive air showers (EAS) produced by high energy particles impacting the Earth's atmosphere. Milagro's distinct advantage compared to other TeV gamma-ray detectors is that it views a wide field (2 steradian overhead sky) and it continuously operates (> 90% live time ). These factors give Milagro the potential for discovery of new sources with unknown positions and times, such as gamma-ray bursts, flaring AGNs, and observation of diffuse and extended sources like the Galactic plane or large supernova remnants. Here we present a new technique for improving background rejection in Milagro as well as a gamma-ray image of the Cygnus region at energies near 12.5 TeV. We report the detection of both an extended source and a large area of diffuse gamma-ray emission from this region of the galaxy. This new extended source has an extent of 0.32 +/- 0.12 degrees and an integral flux above 12.5 TeV of (1.71 +/- 0.24stat +/- 0.34sys) × 10-13cm-2s-1 assuming a differential source spectrum of E-2.6. The best-fit location for the source is RA = 304.66 +/- 0.13stat +/- 0.25sys degrees and declination 36.96 +/- 0.08stat +/- 0.2sys degrees.

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