摘要
活动星系核(AGN)是宇宙中最奇特的天体之一。它是真正意义上的全波天体,其中X射线波段的发射功率占到全波段功率的50%左右。AGN的X射线辐射研究涉及天体物理中的最基本问题,例如能量产生、辐射机制和宇宙论等,而Chandra X射线卫星的高分辨率图像和光谱对这一研究有着重要作用。以Chandia卫星的部分观测结果为例,简要介绍了几类不同类型AGN的X射线辐射研究进展: (1)宽吸收线类星体APM 08279+5255(z=3.91)的X射线谱分析,以及高红移类星体的观测概况; (2)Seyfert星系NGC 4151延展X射线发射问题的解决,及NGC 1068 X射线辐射与光学波段的高激发态发射线([OⅢ]λ45007)有很强相关性的发现; (3)6个BL Lac天体样本的X射线环境分析; (4)射电星系X射线喷流的观测等。
Active Galactic Nuclei （AGNs） are among the most spectacular objects in the Universe. They produce prodigious emission over an extraordinary broad range in frequency, within which the fraction in X-ray is about 50%. Their research in X-ray is essential in many aspects of astrophysics, such as energy production, radiation mechanism and cosmology, etc. The X-ray spectra and X-ray images with high spatial resolution, which are provided by the X-ray observatory Chandra, allow us to further investigate AGNs, especially to understand the core regions and the physical processes in the center. We here briefly present the recent progress based on Chandra, including （1） the introduction of the X-ray observations of broad absorption line quasar （BAL QSO） APM 08279＋5255 and the important role of X-ray observations of high-redshift QSOs; （2） for the Seyfert galaxy NGC 4151, the Chandra＇s X-ray spectra with high spectral resolution to explore its extended X-ray emission, and the X-ray images of NGC 1068 with high spatial resolution indicating that its X-ray emission is strongly related with high-ionization emission line （[OⅢ]λ5007）; （3） the analysis of X-ray environment of a sample of 6 BL Lac objects; （4） the X-ray jets identified by Chandra observations.
出处
《天文学进展》
CSCD
北大核心
2005年第3期239-247,共9页
Progress In Astronomy
