Discovery of diffuse TeV gamma ray emission from the galactic plane using Milagro detector

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

Milagro is a water Cherenkov extensive air shower array that continuously views the entire overhead sky and is sensitive to gamma rays with energies near 1 TeV. Prior to this work, EGRET had observed the highest energy gamma rays from the Galactic plane. In the direction of the inner Galaxy and at energies between 1 GeV and 30 GeV, EGRET measured a gamma-ray spectral index of approximately αγ = 2.4, harder than the cosmic-ray spectrum. The shape and intensity of the spectrum beyond EGRET energies is sensitive to the production and propagation of cosmic rays. Here we report the detection of the TeV gamma rays from the region of the Milagro inner Galaxy (±5° Galactic latitude and (40°, 100°) Galactic longitude) with a significance of 5σ. The integral flux is estimated to be Φγ(E > 1TeV) = (5.7 ± 2.0)·10 -10 (ster-1cm-2sec-1) assuming a differential power law spectral index of 2.7 and an EGRET-like source distribution. Comparison with EGRET's data from the same part of the Galaxy may be used to constrain models of cosmic-ray production in the Galaxy.

Original languageEnglish (US)
Title of host publicationAIP Conference Proceedings
Pages269-274
Number of pages6
Volume745
DOIs
StatePublished - 2005
Externally publishedYes
EventInternational Symposium on High Energy Gamma-Ray Astronomy - Heidelberg, Germany
Duration: Jul 26 2004Jul 30 2004

Other

OtherInternational Symposium on High Energy Gamma-Ray Astronomy
CountryGermany
CityHeidelberg
Period7/26/047/30/04

Fingerprint

gamma rays
galaxies
cosmic rays
detectors
energy
cosmic ray showers
longitude
sky
propagation
water

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Discovery of diffuse TeV gamma ray emission from the galactic plane using Milagro detector. / Fleysher, Roman.

AIP Conference Proceedings. Vol. 745 2005. p. 269-274.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Fleysher, R 2005, Discovery of diffuse TeV gamma ray emission from the galactic plane using Milagro detector. in AIP Conference Proceedings. vol. 745, pp. 269-274, International Symposium on High Energy Gamma-Ray Astronomy, Heidelberg, Germany, 7/26/04. https://doi.org/10.1063/1.1878415
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