报告题目：Chandra X-ray Spectroscopy of the Jets from SS 433
报 告 人：Prof. Herman Marshall
（MIT Kavli Astrophysics & Space Research Institution, USA）
摘 要：The unusual X-ray binary SS 433 has been observed with the High Energy Transmission Grating Spectrometer on the Chandra X-ray Observatory at different orbital and precessional phases. These data have provided excellent views of the hottest parts of the oppositely directed jets. Emission line widths directly provide the opening angle of the jet. We can also determine the composition, density, temperature, and ionization state of the jet gas. Observations during eclipse can be interpreted by blocking the hotter portions with the companion star. We use these measurements to construct a detailed model of the jet flow, fitting the jet spectra with a cooling flow model where the jet gas is heated in a shock that entrains matter from the accretion disk.
地 点：苏富特 一楼 会议室