极可能是一次黑洞“进食”全过程！“天关”捕捉到罕见天文事件

Core Insights - The article discusses a groundbreaking astronomical event captured by China's first space X-ray astronomy satellite "Tian Guan," which observed an unprecedented source of intense explosion, identified as EP250702a, indicating a potential first observation of a medium-mass black hole tearing apart and consuming a dense white dwarf star [1][2]. Group 1: Event Discovery - "Tian Guan" discovered a highly variable X-ray source during its survey on July 2, 2025, which coincided with gamma-ray bursts detected by the Fermi satellite [1]. - The X-ray signals appeared approximately one day before the gamma-ray bursts, suggesting a different physical mechanism than traditional gamma-ray bursts [1][2]. Group 2: Characteristics of the Event - The research team identified three main characteristics: X-ray radiation precedes gamma rays, the brightness is extremely high with near-light-speed jets, and the event occurred in the outskirts of a distant galaxy rather than its center [2]. - The event's high brightness and rapid decay indicate that the disrupted celestial body is highly dense, ruling out the possibility of a supermassive black hole at the galaxy's center [2]. Group 3: Implications and Contributions - The findings strongly suggest a rare encounter between a medium-mass black hole and a white dwarf star, with theoretical models supporting the ability of medium-mass black holes (ranging from hundreds to thousands of solar masses) to shred such dense stars [2]. - The discovery of EP250702a highlights "Tian Guan's" unique monitoring capabilities and underscores China's contributions to global astronomical exploration [2].