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.

我们检测到来自脉冲星 PSR1706-44 的 1,000 GeV（= 1 TeV）伽马射线。伽马射线通量为 - 10^<-11>cm^<-2>s^<-1>(> 1 TeV)，统计显着性为 13 sigma。脉冲星PSR1706-44是星载实验发现的100 MeV至10 GeV能量区的5颗伽马射线脉冲星之一。我们的结果是这五颗星中第一个探测到来自脉冲星 PSR1706-44 的 1,000 GeV 伽马射线。该天体现在是继蟹状星体之后的第二个极高能伽马射线源，从中检测到 1,000 GeV 伽马射线，统计显着性大于 10 西格玛。对于蟹状脉冲星/星云，我们获得的通量为（7.6* 1.0)X10^<-13>cm^<-2>s^<-1> 检测到的伽马射线能量阈值为 7 TeV，显着性为 4西格玛。蟹状脉冲星/星云是 TeV 极高能量区域中唯一已确定的天体。我们在南半球进行的大天顶角观测具有将可探测伽马射线能量的阈值从天顶处的1 TeV提高到约7 TeV的效果，但具有可探测区域大的优点。因此，在 1-10 TeV 的能量区域，我们的观察结果比其他能量区域具有更好的灵敏度和更大的检测区域。该结果有助于将 TeV 能量下的 Crab 通量建立为伽马射线源的“标准”烛光，切伦科夫成像望远镜将用它来校准。还对 Vela 和 PSR1055-52 脉冲星进行了观测，并且结合这四个伽马射线脉冲星的结果； Crab、Vela、PSR1706-44 和 PSR1055-52，我们希望能够更好地了解这些天体中发生的高能过程。其他类型的天体，例如活动星系 PKS0521-365 和双星射电脉冲星 PSR1259-63还观察到 TeV 伽马射线发射。