Title: Mapping UV-Traced Shocks in the Cygnus Loop: From FUSE to INFUSE

Speaker: Yang Ying（PMO）

Time: 12:15pm, October 17, 2025

Location: 3-302, PMO Xianlin Campus

Abstract: Supernova remnants are the expanding cloud of debris left behind after a star explodes, playing a crucial role in the energy and material cycle of galaxies. The Cygnus Loop, with its proximity and well-defined shell, serves as a key laboratory for studying shock–ISM interactions. Multi-wavelength observations reveal a multiphase structure ranging from hot X-ray plasma to optical cooling filaments, while ultraviolet (UV) emission traces the poorly understood transition layer where hot and cool gas meet. Early UV instruments, despite their low efficiency and narrow fields of view, such as the Far Ultraviolet Spectroscopic Explorer (FUSE), uncovered rich diagnostics in small regions of the Cygnus Loop—revealing complex ionization, shock curvature, and dust destruction in the interaction zone. The next generation of UV integral-field spectrographs, exemplified by INFUSE, will map these shocks across the entire remnant, providing new insight into ISM heating, cooling, and chemical feedback.