A HIGH RESOLUTION VIEW OF THE JET TERMINATION SHOCK IN A HOT SPOT OF THE NEARBY RADIO GALAXY PICTOR A: IMPLICATIONS FOR X-RAY MODELS OF RADIO GALAXY HOT SPOTS
作者： S. J. Tingay , E. Lenc , G. Brunetti , M. Bondi
DOI: 10.1088/0004-6256/136/6/2473
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摘要: Images made with the Very Long Baseline Array (VLBA) have resolved region in a nearby (z = 0.035) radio galaxy, Pictor A, where relativistic jet that originates at nucleus terminates an interaction intergalactic medium, so-called galaxy hot spot. This image provides highest spatial resolution view of such object to date, maximum angular 23 mas corresponding 16 pc, more than three times better previous VLBI observations similar objects. The northwest A spot is into complex set compact components, seen coincide bright part imaged arcsecond-scale Large (VLA). In addition comparison VLA data, we compare our VLBA results data from Hubble Space Telescope and Chandra telescopes, as well new Spitzer data. presence pc-scale components spot, identifying regions containing strong shocks fluid flow, leads us explore suggestion they represent sites synchrotron X-ray production, contributing integrated flux along X-rays self-Compton scattering. scenario natural explanation for morphology its emission, leading very different predictions higher energy spectrum compared studies. From sizes individual their spread, estimate width range 70–700 which comparable estimates PKS 2153−69 0.028), 3C 205 1.534), 4C 41.17 3.8). lower limit this arises may dither direction it passes through backflow material close termination point, creating “dentist drill” effect on inside cavity 700 pc diameter.
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