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Evidence for TeV gamma-ray emission from a region of the galactic plane |
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| Authors: | Atkins R Benbow W Berley D Blaufuss E Coyne D G DeYoung T Dingus B L Dorfan D E Ellsworth R W Fleysher L Fleysher R Gisler G Gonzalez M M Goodman J A Haines T J Hays E Hoffman C M Kelley L A Lansdell C P Linnemann J T McEnery J E Miller R S Mincer A I Morales M F Nemethy P Noyes D Ryan J M Samuelson F W Parkinson P M Saz Shoup A Sinnis G Smith A J Sullivan G W Williams D A Wilson M E Xu X W Yodh G B |
| Institution: | Department of Physics, University of Wisconsin, 1150 University Avenue, Madison, Wisconsin 53706, USA. |
| 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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