0 Assigned ID: 1759 ----- Attempting Submission 1 (Fri Mar 01 20:55:27 GMT 2013) ----- HST Phase I Proposal 1759 (hstjets.apt) successfully submitted. ----- Attempting Submission 2 (Fri Mar 01 23:58:44 GMT 2013) ----- 0 ----- Attempting Submission 1 (Mon Jun 24 08:35:25 GMT 2013) ----- Proper Motions at 500 Mpc: Measuring Superluminal motions in Optical Jets with HST Following the success of a recent archival program to measure precisely the superluminal proper motions of the relativistic jet in the nearby galaxy M87, we propose new ACS/WFC observations of three radio galaxies with optical jets previously detected by HST. The moderately deep imaging we propose will provide us with a well-sampled astrometric reference frame in order to accurately register archival HST images of these jets, using globular clusters and background galaxies to reach sub-pixel astrometric accuracy. In conjunction with archival data, the new observations will provide baselines of 20 years over which to compare the location of knots in these jets, allowing us to measure speeds for individual components with accuracies of 0.2c for the nearby source 3C 264 and 1c for 3C 346 and 3C 273. The kinematics of jets on large scales have not been previously studied, leaving open the question of whether the bright knots and compact features in the jet are standing recollimation shocks, or propogating plasma with possibly relativistic bulk motion. The latter case implies a jet that is intermittent on timescales much longer than the dynamical timescale. Observing proper motions in the optical allows us to study kinematics of compact features associated with zones of in situ particle acceleration which produce the higher-energy optical through X-ray photons, not distinctly visible in radio maps. The selected targets offer a diversity in jet power and morphological type which will allow us to better understand the AGN jet population as a whole, and put constraints on unknowns such as the jet energy content, and the impact of jets on the galaxy and cluster environment. We will observe each target using the ACS/WFC F606W filter and a dithering strategy that uses POS TARGs configured according to the total number of exposures. The POS TARGS have also been offset by a fixed number of pixels from the WFC1 pointing in order to put the targets closer to the readout amplifiers on WFC1, in order to reduce CTE effects. The total number of exposures is simply 4 per orbit: 16 total for 3C 273, and 8 each for 3C 264 and 3C 346, at around 500 - 600 seconds per exposure. 3C273 is roll constrained to avoid blooming and saturation from the quasar core overrunning the jet, which is the area of scientific interest. Saturation is not expected to be a problem for the other two targets. Post-flash is not used as background levels should be adequate with the proposed exposure times. (Note that these observations are NOT duplications as the goal of the project is to measure proper motions and other changes since previous epochs). AGN/QUASARS Default false false false false false SUPPORTED GALAXY JET QSO QUASAR RADIO GALAXY This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY JET QSO QUASAR RADIO GALAXY This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY JET QSO QUASAR RADIO GALAXY This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F606W The scheduling data was generated by CASM 21.2. 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