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Phys. Rev. Lett. 95, 251103 (2005) [5 pages]

Evidence for TeV Gamma-Ray Emission from a Region of the Galactic Plane

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R. Atkins et al.
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Received 15 February 2005; revised 5 October 2005; published 16 December 2005

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∈(40°,100°) and latitude |b|<5°. Under the assumption of a simple power law spectrum, with no cutoff in the EGRET-Milagro energy range, the measured integral flux is ϕγ(>3.5  TeV)=(6.4±1.4±2.1)×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.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.251103
DOI:
10.1103/PhysRevLett.95.251103
PACS:
98.35.−a, 95.85.Pw, 96.40.Pq, 98.70.Rz