来自银道面区域的太电子伏特伽马射线发射的证据。

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

作者信息

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

机构信息

Department of Physics, University of Wisconsin, 1150 University Avenue, Madison, Wisconsin 53706, USA.

出版信息

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

DOI:10.1103/PhysRevLett.95.251103

PMID:16384445

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.

摘要

此前已探测到来自银道面窄带的伽马射线辐射，能量高达30 GeV。我们报告了由米拉格罗探测器（一种用于广延空气簇射的大视场水切伦科夫探测器）探测到的来自银道面一个区域的太电子伏特伽马射线信号的证据。在银经l∈(40度, 100度)和银纬/b/<5度的区域观测到了一个显著性为4.5个标准差的超额信号。在假设为简单幂律谱且在EGRET - 米拉格罗能量范围内无截止的情况下，测得的积分通量为φγ(>3.5 TeV) = (6.4±1.4±2.1)×10−11 cm−2 s−1 sr−1。该通量与该银道区域内EGRET谱在1至30 GeV之间的外推结果一致。