Title: Outburst evolution of MAXI J1820+070: challenges and progresses for accretion-jet paradigm in BHXRB

Speaker: 闫震

Institute: 上海天文台

Host: 马任意

Time: 2025.9.11 周四 14:30

Location: 物理楼 552

Abstract:

The black hole X-ray binary MAXI J1820+070 experienced an extremely bright outburst in 2018, during which it exhibited classic spectral state transitions. To study this outburst, extensive and well-coordinated multi-wavelength observations were carried out using both ground-based and space-based telescopes, covering the full-range from radio to gamma rays. These efforts accumulated rich and comprehensive data across different spectral states, providing an unprecedented opportunity to deeply explore the observational characteristics, evolutionary patterns, and underlying physical processes of black hole accretion flow and jet. This report presents the observational results across multiple wavelengths, outlines the progress made in addressing key questions in the filed of black hole accretion and ejection, and highlights the new challenges and open issues that have emerged.

Bio: 

闫震，上海天文台研究员。2006年毕业于湘潭大学物理系，2011年在中国科学院上海天文台获得博士学位，并留在天文台工作，先后任助理研究员，副研究员，研究员。入选中国科学院青促会会员，国家高层次人才计划，主要研究领域：不同尺度致密天体爆发现象的多波段观测和相关吸积-喷流物理。

Related papers:

https://ui.adsabs.harvard.edu/abs/2025MNRAS.538.1143L/abstract

https://ui.adsabs.harvard.edu/abs/2023Sci...381..961Y/abstract

https://ui.adsabs.harvard.edu/abs/2023MNRAS.520.5544G/abstract