理学 >>> 天文学 >>> 空间天文学 >>> γ射线天文学 >>>
搜索结果: 1-15 共查到知识库 γ射线天文学相关记录25条 . 查询时间(1.531 秒)
伽玛射线暴是一种来自宇宙空间随机方向的短时间内伽玛射线突然增亮的现象。伽玛射线暴虽然早在 1967 年就由 Vela 卫星观测到,但直到 1997 年人们才通过余辉观测确定其寄主星系,并通过寄主星系的红移最终确定了伽玛射线暴的宇宙学起源。对伽玛射线暴研究概况进行了评述:详细介绍了伽玛射线暴及其余辉的观测进展,特别是近期 Swift 卫星和 Fermi 卫星带来的新发现;系统描述了伽玛射线暴标准火球...
The X-ray dim isolated neutron stars (XDINSs) are peculiar pulsar-like objects, characterized by their very well Planck-like spectrum. In studying their spectral energy distributions, the optical/UV e...
While the Swift satellite is primarily designed to study gamma-ray bursts, its ultraviolet and optical imaging and spectroscopy capabilities are also being used for a variety of scientific programs. I...
For more than 15 years, since the days of the Energetic Gamma-Ray Experiment Telescope (EGRET) on board the Compton Gamma-Ray Observatory (CGRO; 1991-2000), it has remained an open question why the pr...
We present the first systematic study of X-ray flare candidates in short gamma-ray bursts (SGRBs) exploiting the large 6-year Swift database with the aim to constrain the physical nature of such fluct...
We present multi-epoch radio and optical observations of the M7 dwarf 2MASS J13142039+1320011. We detect a ~1 mJy source at 1.43, 4.86, 8.46 and 22.5 GHz, making it the most luminous radio emission ov...
We report Fermi/LAT observations and broad-band spectral modeling of the radio-loud active galaxy 4C +55.17 (z=0.896), formally classified as a flat-spectrum radio quasar. Using 19 months of all-sky s...
Many previous studies have determined that the long lasting emission at X-ray, optical and radio wavelengths from gamma-ray bursts (GRBs), called the afterglow, is likely produced by the external forw...
GRAVITAS is an X-ray observatory, designed and optimised to address the ESA Cosmic Vision theme of "Matter under extreme conditions". It was submitted as a response to the call for M3 mission proposal...
伽马射线暴的光变复杂度是描述其光变曲线复杂程度的物理量。由已知红移的伽马射线暴,Reichart等人发现其光变复杂度与各向同性光度之间有正相关性(L∝V~α,α在1.77~3.5之间),即光变越复杂,光度越高。此相关性类似于造父变星的周光关系,可用来估计伽马暴的距离和红移。调研、分析了各种光变复杂度的定义、算法和光变复杂度各向同性光度关系的拟合结果,最后对光变复杂度和光度之间的关系做了总结和展望。
伽马射线暴是宇宙中最剧烈的爆发现象之一。Swift卫星的快速定位和Fermi卫星的宽、高能段观测,使得伽马暴的观测可以全波段进行。通过Swift的观测可以对伽马暴现象的本质有进一步的理解,而Fermi卫星提供了一些暴高能光子的辐射数据,为进一步研究暴的辐射机制和伽马暴以及它的余辉提供了有力的依据。介绍了Swift和Fermi卫星发射后一些伽马暴的观测和理论研究进展。
2008 年秋天,3C 454.3 在° 射线能段和光学波段呈现出非常大的爆发,在这次爆发过程中Fermi/LAT 和SMARTS 都对其进行了观测。通过对° 射线能段与SMARTS J 及B 波段在这次大爆发期间获得的光变数据进行细致的DCF 分析发现:这段时期内3C 454.3 的J 波段光变落后° 射线光变大约2 d。在进行相关性分析过程中,对DCF 做了稍许改进,得到一种改进的DCF-时间...
Last Moments in the Life of a Compact Binary System:Gravitational Waves, Gamma-Ray Bursts and Magnetar Formation。
Supernovae and Gamma Ray Bursts。

中国研究生教育排行榜-

正在加载...

中国学术期刊排行榜-

正在加载...

世界大学科研机构排行榜-

正在加载...

中国大学排行榜-

正在加载...

人 物-

正在加载...

课 件-

正在加载...

视听资料-

正在加载...

研招资料 -

正在加载...

知识要闻-

正在加载...

国际动态-

正在加载...

会议中心-

正在加载...

学术指南-

正在加载...

学术站点-

正在加载...