10763( 2) - 10/12/05 13:17 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10763 Version: 2 Check-in Time: 12-Oct-2005 17:17:16 Title The Guitar Nebula: A Bow Shock that Traces ISM Turbulence and Accelerates Relativistic Particles ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 14 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Shami Chatterjee Associated Universities, Inc. CoI: Prof. James M. Cordes Cornell University N CoI: Prof. Bryan Gaensler Harvard University N CoI: Prof. Roger Romani Stanford University N CoI: Prof. Melville P. Ulmer Northwestern University N CoI: Prof. Ellen Zweibel University of Wisconsin - Madison N CoI: Prof. John P. Finley Purdue University N ------------------------------------------------------------------------------------ Abstract We propose joint Chandra and HST observations of the Guitar Nebula, an extraordinary bow-shock nebula produced by a very high-velocity but otherwise ordinary pulsar. Prior HST observations show epoch dependent changes in shock structure that signify changing ISM conditions. An enigmatic jet or filament is seen in a Chandra ACIS image (year 2000), unlike jets from the Crab or other young pulsars. New Chandra observations will reveal the relative motion of the jet and the pulsar (which has moved by 0.9 arcsec) and thus determine if self confinement or special structure in the ISM plays a dominant role in shaping the jet, and will constrain the particle acceleration mechanism. We request joint high-resolution HST observations to contemporaneously determine the ISM density profile. ------------------------------------------------------------------------------------ 10763( 2) - 10/12/05 13:17 - [ 2] Observations Description ------------------------ The Guitar Nebula is an extended bow shock nebula, approximately 85 arcsec long and 40 arcsec wide, at a position angle of 50 degrees E of N. The key region of interest is the tip of the bow shock, where the high velocity pulsar B2224+65 probes the changing interstellar medium density. We have described our target as a circular region 85 arcsec in diameter, centered at (RA=22:25:47.745, Dec=+65:35:08.84, J2000) but it is critically important that the tip, located at (RA=22:25:52.5, Dec=+65:35:34.3, J2000), is imaged on the WFC chip, away from the chip gap and the edges. Instead of specifying an ORIENT constraint, we have centered the nebula at WFC1-FIX, which accomodates the entire nebula on WFC1. We use a 12-point dither pattern and the F658N narrow band filter to image the H-alpha nebula, resulting in individual exposures of 1225 sec, spanning 3 CVZ orbits. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10763( 2) - 10/12/05 13:17 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GUITAR- ISM, EMISSION LINE RA=22H25M47.7450S, J2000 F-LINE(6563)=2E-15 NEBULA NEBULA DEC=+65D35'8.84", REGION, R=42.5", PLATE-ID=034Q Coordinate Source: HST_IMAGE Comments: Prior HST observations used DGESTAR = '0427600582F2' (2001) DGESTAR = '0427600550F2' (1994). 10763( 2) - 10/12/05 13:17 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE ACS-WFC-DITHER-BOX Pattern_Purpose DITHER DITHER Number_Of_Points 3 4 Point_Spacing 3.011 0.265 Line_Spacing 0.187 Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 85.28 20.67 Angle_Between_Sides 69.05 Center_Pattern YES YES ------------------------------------------------------------------------------------------------------------------------------------ 10763( 2) - 10/12/05 13:17 - [ 5] Visit: 01 Visit Priority: Visit Requirements: CVZ 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GUITAR-NEBU ACS/WFC ACCUM WFC1-FIX F658N CR-SPLIT=NO 1 1224 S PATTERN 1 1 LA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GUITAR-NEBULA 1 ACS/WFC ACCUM WFC1-FIX F658N 1 1 none none tbd N/A GUITAR-NEBULA 1 ACS/WFC ACCUM WFC1-FIX F658N 1 2 none none tbd N/A GUITAR-NEBULA 1 ACS/WFC ACCUM WFC1-FIX F658N 1 3 none none tbd N/A GUITAR-NEBULA 1 ACS/WFC ACCUM WFC1-FIX F658N 1 4 none none tbd N/A GUITAR-NEBULA 1 ACS/WFC ACCUM WFC1-FIX F658N 2 1 none none tbd N/A GUITAR-NEBULA 1 ACS/WFC ACCUM WFC1-FIX F658N 2 2 none none tbd N/A GUITAR-NEBULA 1 ACS/WFC ACCUM WFC1-FIX F658N 2 3 none none tbd N/A GUITAR-NEBULA 1 ACS/WFC ACCUM WFC1-FIX F658N 2 4 none none tbd N/A GUITAR-NEBULA 1 ACS/WFC ACCUM WFC1-FIX F658N 3 1 none none tbd N/A GUITAR-NEBULA 1 ACS/WFC ACCUM WFC1-FIX F658N 3 2 none none tbd N/A GUITAR-NEBULA 1 ACS/WFC ACCUM WFC1-FIX F658N 3 3 none none tbd N/A GUITAR-NEBULA 1 ACS/WFC ACCUM WFC1-FIX F658N 3 4 none none tbd N/A 10763( 2) - 10/12/05 13:17 - [ 6] Summary Form for Proposal 10763 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CVZ PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F658N ------------------------------------------------------------------------------------------------------------------------------------ Target Names GUITAR-NEBULA ------------------------------------------------------------------------------------------------------------------------------------