Complex shock structure in the western hot-spot of Pictor A

摘要: We have carried out simulations of supersonic light jets in order to model the features observed optical and radio images western hot-spot galaxy Pictor A. considered with density ratios eta=1e-2 - 1e-4, Mach numbers ranging between 5 50. From each simulation, we generated ray-traced maps surface brightness at a variety jet inclinations, study appearance time-dependent luminous structures vicinity hot-spot. compare these rendered A remarkable feature observations is bar-shaped "filament" inclined almost right angles inferred direction extending 24" (10.8 /h kpc) along its longest axis. The constraints reproducing this structure indicate that lies nearly plane sky. results simulation are also consistent other found image This filament arises from surging behaviour near hot-spot; provoked by alternate compression decompression turbulent backflow cocoon. examine arguments for being more acute angle line sight find our preferred orientation just limits on ratio X-ray counter-jet. determine simulations, function cumulative distribution intrinsic brightnesses. latter may be used quantify use estimation relativistic effects.