The Outburst of HST-1 in the M87 Jet
Cheung, C. C.; Sparks, W. B.; Wilson, A. S.; Harris, D. E.; Biretta, J. A.; Perlman, E. S.; Junor, W.
United States
Abstract
The X-ray intensity of knot HST-1, 0.85" from the nucleus of the radio galaxy M87, has increased by more than a factor of 50 during the last 5 yr. The optical increase is similar, and our more limited radio data indicate a commensurate activity. We give the primary results of our Chandra X-Ray Observatory monitoring program and consider some of the implications of this extreme variability in a relativistic jet. We find that the data support a ``modest beaming synchrotron'' model as indicated in our earlier papers. Based on this model, the decay of the X-ray light curve appears to be dominated by the light-travel time across the emitting region of HST-1, rather than synchrotron loss timescales.