Evidence for TeV Gamma-Ray Emission from a Region of the Galactic Plane
- Department of Physics, University of Wisconsin, 1150 University Avenue, Madison, Wisconsin 53706 (United States)
- Santa Cruz Institute for Particle Physics, University of California, 1156 High Street, Santa Cruz, California 95064 (United States)
- Department of Physics, University of Maryland, College Park, Maryland 20742 (United States); and others
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 (set-membership sign) (40 deg.,100 deg.) and latitude vertical bar b vertical bar <5 deg. Under the assumption of a simple power law spectrum, with no cutoff in the EGRET-Milagro energy range, the measured integral flux is {phi}{sub {gamma}}(>3.5 TeV)=(6.4{+-}1.4{+-}2.1)x10{sup -11} cm{sup -2} s{sup -1} sr{sup -1}. This flux is consistent with an extrapolation of the EGRET spectrum between 1 and 30 GeV in this galactic region.
- OSTI ID:
- 20699692
- Journal Information:
- Physical Review Letters, Vol. 95, Issue 25; Other Information: DOI: 10.1103/PhysRevLett.95.251103; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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