首页   按字顺浏览 期刊浏览 卷期浏览 HEAO 3 observations of strong variable 0.5‐3 MeV emission from the Taurus region
HEAO 3 observations of strong variable 0.5‐3 MeV emission from the Taurus region

 

作者: James C. Ling,   Charles D. Dermer,  

 

期刊: AIP Conference Proceedings  (AIP Available online 1991)
卷期: Volume 232, issue 1  

页码: 361-363

 

ISSN:0094-243X

 

年代: 1991

 

DOI:10.1063/1.40907

 

出版商: AIP

 

数据来源: AIP

 

摘要:

We briefly report preliminary results of observations of strong (≳10&sgr;) variable MeV emission from the Taurus region, possibly the Crab nebula, in 1980 by the HEAO 3 Gamma‐Ray Spectroscopy experiment. The ∼50‐day time‐averaged spectrum of the Crab shows a new component, which consists of a hard spectral ‘‘knee’’ in the 0.4–1 MeV range followed by a higher energy component extending to ≳3 MeV, superposed on the canonical Crab power law spectrum with a spectral index of 2.2. This new spectral component was not observed 4 months earlier in the fall of 1979, when the spectrum was consistent with a single power law with the index of 2.2, the same as that observed in 1980. There is no indication that the &ggr;‐ray emission was pulsed. Such variable emission could be interpreted as Comptonization of soft photons by relativistic electrons in the magnetic field surrounding the neutron star.

 

点击下载:  PDF (210KB)



返 回