0 Assigned ID: 839 ----- Attempting Submission 1 (Fri Mar 06 22:11:38 GMT 2020) ----- 0 ----- Attempting Submission 1 (Mon Jun 29 19:18:21 GMT 2020) ----- Supernova shocks have been long-favored as sites for accelerating cosmic rays (CR). They have been studied extensively in multiple wavebands to look for signatures of accelerated particles in the strong amplified magnetic fields created at shock fronts. In this proposal, we present an optical-only study of CR acceleration, by examining a specific class of astrophysical shocks known as 'Balmer shocks'. Our target is supernova remnant (SNR) 0519-69.0 in the Large Magellanic Cloud (LMC) that has strong Balmer emission. We propose a third ACS/WFC observation of this SNR, which will provide a ~10 year baseline to measure the proper motion of the remnant. The well known distance to the LMC allows one to convert the proper motions to accurate shock velocities. The shock velocities, combined with ground-based spectroscopic measurements of the broad H alpha line-widths will be used to calculate the CR acceleration efficiency over a broad range of shock velocities using state-of-the-art models. We demonstrate the significant reduction in shock velocity uncertainties resulting from increasing the time baseline from the current 1 year to 10 years. We highlight the importance of matching the observational configuration to minimize systematic errors in the proper motion. With the new observation, we aim to reveal the dependence of CR acceleration efficiency on shock velocity. This is a single filter observation will be a four point dither pattern with cosmic-ray splits over the course of 2 orbits. The filter needed is the ACS narrow-band H-alpha filter F658N. We request for a roll-angle of 131.25 (+/- 5 ) degrees. Ms. Prasiddha Arunachalam is a graduate student working with Dr. John P. Hughes on observational and theoretical studies of supernova remnants. She has expertise in analyzing HST data, and has led the project that has resulted in some of the work shown in the proposal. Dr. John P. Hughes is an expert in multi-wavelength observational studies of supernova remnants and clusters of galaxies. He has been Co-I on a number of HST projects and has led 4 regular GO HST programs: 11015 (cycle 15, 8 orbits); 12017 (cycle 17, 4 orbits); 12755 (cycle 19, 6 orbits); and 14153 (cycle 23, 8 orbits). These programs have resulted in five published papers to date with several others in preparation. Dr. Luke Hovey is an expert in reducing HST data and making precision proper motion measurements of supernova remnant shocks. He has led the efforts on a successful GO HST program: 14733 (cycle 24, 2 orbits), and is co-mentoring the associated research project lead by Prasiddha Arunachalam (paper in preparation). Dr. Kristoffer Eriksen is an expert in modeling the emission and hydrodynamics of supernova remnants. He has been an author on several refereed papers utilizing space-based data, including as Co-I on two published HST papers, with another in preparation. Stellar Physics and Stellar Types 6 false false false false false false false SUPPORTED EXT-MEDIUM EMISSION LINE NEBULA SHOCK FRONT SNR This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 SURF-LINE(6563)=2e-16 ACS/WFC Imaging No No F658N POS-TARG DITHER 0.262 LINE 0.192 false false 68.14 4 18.39 ACS-WFC-DITHER-BOX 1 false 1604342673253 /private/var/folders/bl/s7q0tqnn5gbcbyvcfnrhj2rh0004nc/T/OPVisit4559696045571294090.xml The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. We request that the Orient be as close to 131.25 degrees as possible in order to match the previous observation (Proposal ID: 12017) in 2010 and 2011, which had a PA_APER value of 128.781. This is done so that the PSFs of the first epoch images precisely match that of the new image to be obtained here. (Tic-Visit :proposal-id 16161 :visit-id "01" :proposal-version -1 :trans-version "20200619" :date "02-Nov-2020 13:44:33.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16161 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16161 :visit-id "01" :orbit-number 1 :pcs-time 383 :si-vis-utilization 3103 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3486 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16161 :visit-id "01" :orbit-number 2 :pcs-time 392 :si-vis-utilization 3094 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3486 :pcs-gap 0 ) true 2 0