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2016年1月13日学术报告
2016-01-11 | 【

  时间:1月13日(周三)上午10点 

  地点:主楼A419 

  报告人:罗斌 (南京大学) 

  主持人:张双南 

  题目:Exceptional X-ray Weak Quasars---Implications for Accretion Flows, BLRs, & Winds 

  摘要:Luminous X-ray emission is considered a universal property of active galactic nuclei (AGNs), and built upon this idea are extragalactic X-ray surveys for finding AGNs efficiently throughout the universe. I will introduce two types of exceptional X-ray weak type 1 quasars in this talk: intrinsically X-ray weak broad absorption line (BAL) quasars and weak emission-line quasars (WLQs). Via NuSTAR hard X-ray observations of a small sample of BAL quasars with <10 keV weakness, we suggested that the X-ray weakness is intrinsic in at least some of the targets. We conducted an X-ray and multiwavelength study of 51 WLQs, and found that about half of these quasars are X-ray weak that is likely due to intrinsic absorption. Implications of these results for the quasar accretion disks, broad emission-line regions, and disk winds are discussed.

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