15495( 3) - 30-Dec-2018 14:08:34 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15495 Version: 3 Check-in Time: 30-Dec-2018 14:08:34 STScI Edit Number: 0 Title An HST proper-motion and spectral study of the optical jet in 4C +00.58 ------------------------------------------------------------------------------------ Type Cycle GO 26 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Eileen T Meyer University of Maryland Baltimore County Y CoI: Dr. Markos Georganopoulos University of Maryland Baltimore County N CoI: Dr. Edmund Hodges-Kluck University of Michigan N CoI: Dr. William B. Sparks SETI Institute N CoI: Dr. Marco Chiaberge Space Telescope Science Institute - ESA N CoI: Dr. Roeland P. van der Marel Space Telescope Science Institute N CoI: Dr. Jay Anderson Space Telescope Science Institute N CoI: Prof. Eric S. Perlman Florida Institute of Technology N ------------------------------------------------------------------------------------ Abstract We have recently discovered a remarkably detailed optical jet in the nearby radio galaxy 4C 00.58, which we consider a 'moderate power' hybrid-source analog to the archetypal jets M87 and 3C 273. The unusual 'X-shaped' large-scale radio morphology of this source is thought to be the result of a recent merger-induced reorientation, and the jet displays a remarkable series of 'cannonball' ejections clearly detected in radio through X-rays. The clarity of the optical features and nearness of the source make it an ideal target for a prospective HST proper-motions study. Previous HST proper-motion studies which revealed superluminal motions in M87 and 3C 264 relied on archival WFPC2 observations and long observing baselines. With the high astrometric precision possible with an all-ACS/WFC imaging study, we can reach 0.5c accuracy with a time baseline of 4 years, requiring only a single additional orbit in cycles 24 and 26, in combination with our existing ACS/WFC imaging from 2015. We also request complimentary near-UV observations (WFC3/UVIS F225W) in order to map the spectral evolution of the knots and hotspot and allow better constraints on the emission mechanisms and physical parameters in the jet. ------------------------------------------------------------------------------------ Observations Description ------------------------ This is an imaging project for the optical jet located in nearby elliptical galaxy 4C +00.58. The ACS/WFC F606W observations are identical in setup to the previous imaging done in cycles 22 and 24. The imaging in all three epochs (22, 24, 26) in the F606W filter are part of a proper-motions monitoring project. In addition, two orbits of WFC3/UVIS imaging in F225W were taken in cycle 24, in order to measure the synchrotron spectrum of the resolved knots in the jet. For the ACS/WFC imaging, we use a 5-point dithering pattern which covers the chip gap, optimized to sample the PSF. ORIENT constraints are included as a caution against possible saturation spikes from the bright quasar core over-running the jet. While the core was not saturated in previous imaging with similar exposure times, quasar cores are known to be variable. ------------------------------------------------------------------------------------ 15495( 3) - 30-Dec-2018 14:08:34 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 4C00.58 GALAXY, JET, QUASAR, RA=16H06M12.7300S, J2000 V = 17.5 RADIO GALAXY DEC=+00D00'27.36" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 15495( 3) - 30-Dec-2018 14:08:34 - [ 3] Visit: 01 (ACS-optical) Visit Requirements: ORIENT 2.5D TO 47.5 D; ORIENT 92.5D TO 137.5 D; ORIENT 182.5D TO 227.5 D; ORIENT 272.5D TO 317.5 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 4C00.58 ACS/WFC ACCUM WFC1 F606W 1 390 S (390 POS TARG 0, 0 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 4C00.58 ACS/WFC ACCUM WFC1 F606W 1 390 S (390 POS TARG 0.15914, S) 0.23969 ------------------------------------------------------------------------------------------------------------------------------------ 3 4C00.58 ACS/WFC ACCUM WFC1 F606W 1 390 S (390 POS TARG 0.31641, S) 0.08319 ------------------------------------------------------------------------------------------------------------------------------------ 4 4C00.58 ACS/WFC ACCUM WFC1 F606W 1 390 S (390 POS TARG 0.07990, S) 4.19413 ------------------------------------------------------------------------------------------------------------------------------------ 5 4C00.58 ACS/WFC ACCUM WFC1 F606W 1 390 S (390 POS TARG 0.28771, S) 4.28896 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 4C00.58 1 ACS/WFC ACCUM WFC1 F606W none none none none 1 N/A 4C00.58 2 ACS/WFC ACCUM WFC1 F606W none none none none 1 N/A 4C00.58 3 ACS/WFC ACCUM WFC1 F606W none none none none 1 N/A 4C00.58 4 ACS/WFC ACCUM WFC1 F606W none none none none 1 N/A 4C00.58 5 ACS/WFC ACCUM WFC1 F606W none none none none 1 N/A 15495( 3) - 30-Dec-2018 14:08:34 - [ 4] Summary Form for Proposal 15495 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 182.5D TO 227.5 D, ORIENT 2.5D TO 47.5 D, ORIENT 272.5D TO 317.5 D, ORIENT 92.5D TO 137.5 D, POS TARG 0, 0, POS TARG 0.07990, 4.19413, POS TARG 0.15914, 0.23969, POS TARG 0.28771, 4.28896, POS TARG 0.31641, 0.08319 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names 4C00.58 ------------------------------------------------------------------------------------------------------------------------------------