Black Hole Accretion and X-Ray Variability in AGN.

Vollrath, Z.

Technical Information Center Oak Ridge Tennessee

关键词: Black holes;    Stars;    Galaxies;    Nuclei;    Probes;   

RP-ID  :  DE2004833107

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Active Galactic Nuclei (AGN) have very luminous centers which are so bright that the surrounding stars can not adequately account for the energy emission of AGN. One of the most accepted explanations for this energy release is black hole accretion. These black holes accrete near by gas and dust, and as a result gravitational potential is converted to energy which is released. In order to probe the accretion mechanism which lies close to the black hole, short time scale X-ray variability is analyzed. The very short time scale variability will increase understanding of the processes that occur in the heart of galaxies. Data from the ASCA X-ray telescope was reduced and analyzed using the programs FTOOLS, XSELCT, and ASCASCREEN. Light curves and event lists were generated for long term observations of different AGN which were sent to collaborators for further analysis using the event time arrivals. The analysis will compare accretion and jet dominated AGN and will provide use with an understanding of how short scale time variability can relate to the mechanism very close to black holes buried within AGN.