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Southern Sky Survey with Cerenkov Telescope for High Energy Gamma-Rays

使用切伦科夫望远镜进行高能伽马射线南方巡天

基本信息

批准号：
04044041
负责人：
KIFUNE Tadashi
金额：
$ 5.5万
依托单位：
Institute for Cosmic Ray Research, University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

We have detected 1,000 GeV(=1 TeV) gamma-rays from a pulsar PSR1706-44. The gamma-ray flux is - 10^<-11>cm^<-2>s^<-1>(> 1 TeV), with a statistical significance of 13 sigma. The pulsar PSR1706-44 is one of the five gamma-ray pulsars which have been found by satellite-borne experiments in the energy region of 100 MeV to 10 GeV. Our result is the first to detect 1,000 GeV gamma-rays from the pulsar PSR1706-44 among these five. This object is now the second very high energy gamma-ray source next the Crab, from which 1,000 GeV gamma-rays was detected with a statistical significance larger than 10 sigma.For the Crab pulsar/nebula, we obtained a flux of(7.6*1.0)X10^<-13>cm^<-2>s^<-1> at 7 TeV threshold of detected gamma-ray energy with a significance of 4 sigma. The Crab pulsar/nebula has been the only established object in the very high energy region at TeV. Large zenith angle observation we made from the southern hemisphere has an effect of increasing the threshold of detectable gamma-ray energy to about 7 TeV from 1 TeV at the zenith, however with a merit of a large detection area available. In the energy region of 1-10 TeV, our observation has, thus, a better sensitivity with a larger detection area at these energies than the others. The result contributes to establishing the Crab flux at TeV energies as a "standard" candle of gamma-ray source with which each telescope of imaging Cerenkov is to be calibrated.Observation of the Vela and PSR1055-52 pulsars were also made, and, combining the results on these four gamma-ray pulsars ; Crab, Vela, PSR1706-44 and PSR1055-52, we expect to obtain a better understanding of high energy processes which take place in these objects.Other types of objects such as an active galaxy PKS0521-365 and a binary radio pulsar PSR1259-63 were also observed for TeV gamma-ray emission.

我们已经从脉冲星PSR 1706 - 44探测到了1,000 GeV（= 1 TeV）的伽马射线。伽马射线通量为-10 ^cm ^s ^（> 1 TeV），统计显著性为13 sigma。<-11><-2><-1>脉冲星PSR1706 - 44是迄今为止通过星载实验发现的5颗能量在100 MeV~10 GeV的γ射线脉冲星之一。我们的结果是第一个检测到1,000 GeV的伽马射线从脉冲星PSR 1706 - 44在这五个。这个天体现在是仅次于蟹状星云的第二个非常高能量的伽马射线源，从蟹状星云中探测到了1,000 GeV的伽马射线，统计显著性大于10 sigma。对于蟹状星云脉冲星/星云，我们在7 TeV的探测伽马射线能量阈值处获得了（7.6 * 1.0）× 10 ^cm ^s ^，显著性为4 sigma。<-13><-2><-1>蟹状星云脉冲星/星云是唯一在TeV的极高能量区域建立的物体。我们从南半球进行的大天顶角观测具有将可探测的伽马射线能量的阈值从天顶处的1 TeV增加到约7 TeV的效果，然而具有大探测区域的优点。因此，在1 - 10 TeV的能量范围内，我们的观测在这些能量下比其他能量具有更好的灵敏度和更大的检测面积。这一结果有助于建立TeV能区的Crab通量作为γ射线源的"标准"烛光，用它来校准切伦科夫成像望远镜的每一个望远镜。螃蟹，船帆座，PSR 1706 - 44和PSR 1055 - 52，我们希望能更好地了解这些天体中发生的高能过程。其他类型的天体，如活动星系PKS 0521 - 365和射电脉冲双星PSR 1259-63个也观测到TeV的γ射线发射。