哈勃太空望远镜观测到M87喷流中的异常耀斑
Hubble Space Telescope observations of an extraordinary flare in the M87 jet
摘要：
HST-1是沿着M87喷流的一个结，距离星系核0.85角秒，自2000年初以来经历了戏剧性和意想不到的耀斑活动。我们目前的分析哈勃太空望远镜近紫外（NUV）成像的M87喷流从1999年5月至2006年12月，揭示了NUV强度的HST-1增加了90倍，其静态水平和超越星系的核心。我们得到的NUV光变曲线与其他波段的光变曲线是同步的。HST-1耀斑期间X射线和NUV光变曲线的相关性证实了M87喷流中X射线发射的同步辐射起源。在HST-1中观测到的爆发与AGN可变性的常见定义不一致，该定义通常与耀变体有关，并且起源于中心黑洞附近。事实上，M87喷流并没有对准我们的视线，HST-1位于距离银河系核心超大质量黑洞100万Schwarzchild半径的地方。
英文摘要：
HST-1, a knot along the M87 jet located 0.85 arcsec from the nucleus of the galaxy has experienced dramatic and unexpected flaring activity since early 2000. We present analysis of Hubble Space Telescope Near-Ultraviolet (NUV) imaging of the M87 jet from 1999 May to 2006 December that reveals that the NUV intensity of HST-1 has increased 90 times over its quiescent level and outshines the core of the galaxy. The NUV light curve that we derive is synchronous with the light curves derived in other wavebands. The correlation of X-ray and NUV light curves during the HST-1 flare confirms the synchrotron origin of the X-ray emission in the M87 jet. The outburst observed in HST-1 is at odds with the common definition of AGN variability usually linked to blazars and originating in close proximity of the central black hole. In fact, the M87 jet is not aligned with our line of sight and HST-1 is located at one million Schwarzchild radii from the super-massive black hole in the core of the galaxy.
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