16161( 3) - 02-Nov-2020 18:45:34 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16161 Version: 3 Check-in Time: 02-Nov-2020 18:45:34 STScI Edit Number: 1 Title Measuring Cosmic Ray Acceleration in a Young Supernova Remnant in the Large Magellanic Cloud: The Case for a Third Epoch Observation of SNR0519-69.0 ------------------------------------------------------------------------------------ Type Cycle GO 28 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prasiddha Arunachalam Rutgers the State University of New Jersey Y CoI: Dr. John P. Hughes Rutgers the State University of New Jersey N CoI: Dr. Luke Hovey Los Alamos National Laboratory N CoI: Dr. Kristoffer A. Eriksen Los Alamos National Laboratory N ------------------------------------------------------------------------------------ Abstract 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. ------------------------------------------------------------------------------------ Observations Description ------------------------ 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. ------------------------------------------------------------------------------------ 16161( 3) - 02-Nov-2020 18:45:34 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SNR-B0519-69 EXT-MEDIUM, EMISSION RA=05H19M34.7800S, J2000 V = 17.5 +/- 0.5 SURF-LINE(6563)=2e-16 .0 LINE NEBULA, SHOCK DEC=-69D02'8.80" FRONT, SNR Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 16161( 3) - 02-Nov-2020 18:45:34 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.262 Line_Spacing 0.192 Coordinate_Frame POS-TARG Pattern_Orient 18.39 Angle_Between_Sides 68.14 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 16161( 3) - 02-Nov-2020 18:45:34 - [ 4] Visit: 01 Visit Requirements: ORIENT 126.25D TO 136.25 D On Hold Comments: Additional Comments: 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. 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 SNR-B0519-6 ACS/WFC ACCUM WFC2 F658N CR-SPLIT=2 1 1155 S GS ACQ SCENARIO BASE1B3; 9.0 see below PATTERN 1 1 (4971 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SNR-B0519-69.0 1 ACS/WFC ACCUM WFC2 F658N 1 none none 1 1 613.0 S SNR-B0519-69.0 1 ACS/WFC ACCUM WFC2 F658N 1 none none 2 1 612.0 S SNR-B0519-69.0 1 ACS/WFC ACCUM WFC2 F658N 2 none none 1 1 612.0 S SNR-B0519-69.0 1 ACS/WFC ACCUM WFC2 F658N 2 none none 2 1 612.0 S SNR-B0519-69.0 1 ACS/WFC ACCUM WFC2 F658N 3 none none 1 2 631.0 S SNR-B0519-69.0 1 ACS/WFC ACCUM WFC2 F658N 3 none none 2 2 631.0 S SNR-B0519-69.0 1 ACS/WFC ACCUM WFC2 F658N 4 none none 1 2 630.0 S SNR-B0519-69.0 1 ACS/WFC ACCUM WFC2 F658N 4 none none 2 2 630.0 S 16161( 3) - 02-Nov-2020 18:45:34 - [ 5] Summary Form for Proposal 16161 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=2 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1B3, ORIENT 126.25D TO 136.25 D, PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F658N ------------------------------------------------------------------------------------------------------------------------------------ Target Names SNR-B0519-69.0 ------------------------------------------------------------------------------------------------------------------------------------