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A Study of Uhe Cosmic Gamma Rays at Mt. Chacaltaya - Gamma Ray Sources in SN 1987A and the Southern Ssy -

查卡尔塔亚山 Uhe 宇宙伽马射线的研究 - SN 1987A 和南 Ssy 的伽马射线源 -

基本信息

批准号：
63044095
负责人：
KANEKO Tatunosuke
金额：
$ 5.76万
依托单位：
Okayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63044095/
关键词：
Air showers Primary gamma-rays Gamma-ray astronomy

项目摘要

The Bolivian Air Shower Joint Experiment group has operated two air shower arrays in order to search for point and diffuse gamma-ray sources at Mt. Chacaltaya (5200m, 68.1^oW, 16.3^oS) in Bolivia. The purpose of the study is to make clear the problem on Cosmic Ray Origin.After three years observations, the observed results are as follows :1. UHE gamma-ray emission from X-ray eclipsing binaries (Vela X-1, Cen X-3, X1822-371), Vela pulsar, a radio galaxy (Cen A), a flaring X-ray source (SS433) and the center of Galaxy are examined by comparing the amount of onーsource low muon events with that of background cosmic rays estimated from off-source low muon events. The results at present show no significant evidence of UHE gamma-ray emission from the above mentioned objects. The 95% C. L. upper limits of the emission are obtained.2. Observation for UHE gamma-ray emission from notable SN1987A has been carried out since January 1988. The DC excess for daily and weekly variation was analyzed. There is no significant evidence concerning the arrival of UHE gamma-rays from SN1987A. No information is also presented any group in Australia, New Zealand, the Republic of South Africa and the South Pole. The upper limit on the flux of gamma-rays with energies above 100 TeV is estimated as being 2.4 x 10^<-13>cm^<-2>s^<-1> (95% C. L.).3. Diffuse gamma-rays with energies above 100 TeV is analyzed using selected shower with low content of muons. Our interesting region is that of 180^ﾟ - 210^ﾟ in right ascension (R. A.) and 0^ﾟ - -40^ﾟ in declination (delta) from the report in 1985. However, it wasn't found the excess in a such region. In place of this region, new one of 135^ﾟ- 150^ﾟ in R. A. and -20^ﾟ --40^ﾟ in delta presents 4.6sigma (sigma, standard deviation) of the excess. Li-Ma test for small number events, however, shows 3.2sigma. So, it seems statistically no significant.

玻利维亚空气簇射联合实验小组已经操作了两个空气簇射阵列，以便在Mt.位于玻利维亚的查卡尔塔亚（5200米，西经68.1度，南纬16.3度）。为了弄清宇宙线起源的问题，经过三年的观测，得到了如下结果：1.宇宙线起源的物理机制。本文通过比较由源外低μ子事件估算的背景宇宙线量和源外低μ子事件估算的背景宇宙线量，研究了X射线食双星（船帆座X-1，半人马座X-3，X1822-371）、船帆座脉冲星、射电星系（半人马座A）、耀斑X射线源（SS 433）和银河系中心的UHE γ射线辐射。目前的结果表明，上述物体没有发射超高能伽马射线的重要证据。95%的C。L.得到了发射的上限。自1988年1月以来，我们对著名的SN 1987 A进行了超高能γ射线观测。分析了每日和每周变化的DC过量。没有关于来自SN 1987 A的UHE伽马射线到达的重要证据。澳大利亚、新西兰、南非共和国和南极的任何团体也没有提供任何信息。能量超过100 TeV的伽马射线通量的上限估计为2.4 x 10^<-13>cm^<-2>s^<-1>（95%C。L.）。3.用低μ子含量的选择簇射分析了能量在100 TeV以上的漫射γ射线。我们感兴趣的区域是赤Ascension 180^K- 210^K（R。A.）1985年报告中的0^10 - 40 ^10/10（delta）。然而，在这样的区域中没有发现过量。在R. A.δ中的-20--40表示4.6 σ（σ，标准差）的超额。而对小事件的Li-Ma检验则为3.2sigma。从统计学上看，这似乎并不重要。