Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4614m&link_type=abstract
American Astronomical Society, AAS Meeting #211, #46.14; Bulletin of the American Astronomical Society, Vol. 39, p.803
Other
Scientific paper
HST-1, a knot along the M87 jet located 0.85 arcseconds 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 May that reveal that the NUV intensity of HST-1 has increased 94 times over its quiescent level. The NUV light curve that we derive is synchronous with the light curves derived in other wavebands, which supports the notion of a compression followed by a rapid expansion as the physical origin of the HST-1 flare and subsequent decline. 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.
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