题 目：Chandra X-ray Observatory imaging survey of quasars
报告人：Herman Marshall
（MIT Kavli Astrophysics & Space Research Institution, USA）
摘 要：I will present recent results from a Chandra X-ray Observatory imaging survey of quasars and high resolution spectroscopy of the SS 433 jets. The survey consisted of 54 quasars with known radio-emitting jets. The jet detection rate was about 65%. We tested a model where the bulk of the X-ray emission arises from inverse Compton scattering of microwave background photons (the IC-CMB) model. For a subset of our sample with known superluminal motion based on VLBI observations, we estimated the angle of the kpc-scale jet to the line of sight by considering the additional information in the bends observed between pc- and kpc-scale jets. These angles are sometimes much smaller than estimates based on the IC-CMB model with a Lorentz factor of 15, indicating that these jets may decelerate significantly from pc scales to kpc scales. I will also report new results from deeper imaging of individual objects with Chandra and HST.
时 间：2011年10月18日（星期二） 上午 10:00
地 点：中科院紫金山天文台 617会议室
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