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. 2005 Dec 16;95(25):251103.
doi: 10.1103/PhysRevLett.95.251103. Epub 2005 Dec 16.

Evidence for TeV gamma-ray emission from a region of the galactic plane

R Atkins  1 , W Benbow, D Berley, E Blaufuss, D G Coyne, T DeYoung, B L Dingus, D E Dorfan, R W Ellsworth, L Fleysher, R Fleysher, G Gisler, M M Gonzalez, J A Goodman, T J Haines, E Hays, C M Hoffman, L A Kelley, C P Lansdell, J T Linnemann, J E McEnery, R S Miller, A I Mincer, M F Morales, P Nemethy, D Noyes, J M Ryan, F W Samuelson, P M Saz Parkinson, A Shoup, G Sinnis, A J Smith, G W Sullivan, D A Williams, M E Wilson, X W Xu, G B Yodh
Affiliations

Evidence for TeV gamma-ray emission from a region of the galactic plane

R Atkins et al. Phys Rev Lett. .

Abstract

Gamma-ray emission from a narrow band at the galactic equator has previously been detected up to 30 GeV. We report evidence for a TeV gamma-ray signal from a region of the galactic plane by Milagro, a large-field-of-view water Cherenkov detector for extensive air showers. An excess with a significance of 4.5 standard deviations has been observed from the region of galactic longitude l E (40 degrees, 100 degrees) and latitude /b/ < 5 degrees. Under the assumption of a simple power law spectrum, with no cutoff in the EGRET-Milagro energy range, the measured integral flux is phi gamma(>3.5 TeV) = (6.4 +/- 1.4 +/- 2.1) x 10(-11) cm(-2) s(-1) sr(-1). This flux is consistent with an extrapolation of the EGRET spectrum between 1 and 30 GeV in this galactic region.

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