我国卫星捕捉到罕见事件

Core Viewpoint - The discovery of an exceptionally bright and rapidly changing X-ray source, designated EP250702a, is likely a medium-mass black hole tearing apart and consuming a white dwarf star, marking the first time such an extreme black hole "feeding" event has been captured by humans [1][2]. Group 1 - The "Tian Guan" satellite detected the unusual X-ray source during routine sky surveys, prompting a global observational effort with multiple telescopes [1]. - The event's brightness variation and spectral characteristics are significantly different from any previously known outbursts, indicating a unique astrophysical phenomenon [1][2]. - The research team proposed a coherent physical model suggesting that only medium-mass black holes, with masses between hundreds to hundreds of thousands of solar masses, can effectively tear apart such dense white dwarfs using tidal forces [2]. Group 2 - The characteristics of the event, including ultra-short timescales and high peak luminosity, support the hypothesis of a medium-mass black hole interacting with a white dwarf [2]. - The "Tian Guan" satellite's mission is to capture unpredictable extreme transient phenomena in the universe, showcasing China's contributions to global astronomical exploration [2].