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High Energy Gamma-Ray Observations of Peculiar Objects such as Pulsars and Active Galaxies

对脉冲星和活动星系等特殊物体的高能伽马射线观测

基本信息

批准号：
06044052
负责人：
KIFUNE Tadashi
金额：
$ 5.38万
依托单位：
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：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06044052/
关键词：
Gamma Ray Astronomy Pulsar Active Galaxy Supernova Remnant Origin of Cosmic Rays Acceleration of Cosmic Rays Air Cerenkov Telescope PSR1706-44 ガンマ線パルサー超高エネルギーガンマ線かにパルサー星雲帆座パルサー解像型チェレンコフ望遠鏡

项目摘要

(1) We have, by the end of the fiscal year 1994, obtained evidence of VHE (very high energy) gamma rays from Crab nebula and PSR B 1706-44. The data obtained in 1993 and 1994 suggested an interesting hint of VHE gamma ray signal from Vela pulsar direction, and data analysis, adding 1995 observation, was continued on the Vela as well as on other various objects in the southern sky.(2) We found that evidence of VHE gamma rays from Vela pulsar direction exist in all of the Vela data set over 1993 to 1995. The observed signal appears as "unpulsed" (not modulated with the pulsar period of 89 msec) and the emission region of VHE gamma rays is extended with its maximum intensity shifted by about 0.1ﾟ from the pulsar position. These features suggest that the VHE emission is not from the pulsar magnetosphere. A "wind" of energetic electrons and positrons (pulsar wind) is believed to be ejected from pulsar, causing a shock by colliding with circumstellar matter to emit gamma rays. It is likely that we have seen such a phenomenon in vicinity of the Vela pulsar.(3) From a binary pulsar PSR B 1259-63, we obtained evidence of about 5sigma significance, which encourages repeated observation.(4) We set an upper limit of VHE gamma ray flux from PKS 0521-365, the second nearest AGN (active galactic nuclei) among the GeV gamma ray AGN detected by the gamma ray satellite of Compton Gamma Ray Observatory. The result constrains on various models of gamma ray production as well as on infrared intensity in the extragalactic space.(5) We also studied an intesting object of GeV gamma ray source, CGRO J 1758-23, which includes supernova remnant, pulsar, radio point source and molecular cloud etc. No evidence of VHE gamma rays that appears as a point source was so far discovered, and the case of extended emission remains to be more carefully examined.(6) Prelimiary analysis shows no evidence of VHE emission from other objects such as AGN Centaurus A and pulsar PSR B 1055-52.

(1)到1994财政年度末，我们已经获得了来自CraB星云和PSR B 1706-44的VHE（甚高能）γ射线的证据。1993年和1994年获得的数据表明，从船帆座脉冲星方向发出的甚高能量辐射伽马射线信号有一个令人感兴趣的线索，加上1995年的观测，继续对船帆座以及南部天空的其他各种物体进行数据分析。(2)我们发现，VHE γ射线从船帆座脉冲星方向的证据存在于所有的船帆座数据集在1993年至1995年。观测到的信号表现为“非脉冲”（没有被脉冲星周期89毫秒调制），VHE伽马射线的发射区域被扩展，其最大强度从脉冲星位置偏移了约0.1毫秒。这些特征表明VHE辐射不是来自脉冲星磁层。一股由高能电子和正电子组成的“风”（脉冲星风）被认为是从脉冲星中喷射出来的，通过与星周物质碰撞而产生冲击，释放出伽马射线。我们很可能在船帆座脉冲星附近看到过这样的现象。(3)我们从脉冲双星PSR B 1259-63中获得了约5 σ显著性的证据，这鼓励了重复观测。(4)本文对康普顿γ射线天文台γ射线卫星探测到的GeV γ射线活动星系核中第二近的活动星系核PKS 0521-365的VHE γ射线通量设定了上限。结果约束各种模型的伽马射线生产以及在河外空间的红外强度。(5)我们还研究了一个GeV γ射线源的探测对象CGRO J 1758-23，它包括超新星遗迹、脉冲星、射电点源和分子云等，迄今为止还没有发现VHE γ射线作为点源出现的证据，扩展发射的情况还有待于更仔细的研究。(6)天文学分析显示，没有证据表明VHE辐射来自其他天体，如活动星系核半人马座A和脉冲星PSR B 1055-52。