12917( 3) - 11-Jul-2012 19:41:58 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12917 Version: 3 Check-in Time: 11-Jul-2012 19:41:58 STScI Edit Number: 1 Title The FUV bow-shock nebula of PSR J0437-4715 ------------------------------------------------------------------------------------ Type Cycle GO 20 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Martin Durant University of Florida Y CoI: Dr. Oleg Y. Kargaltsev George Washington University N CoI: Dr. George G. Pavlov The Pennsylvania State University N CoI: Dr. Sami-Matias Niemi University of Florida N CoI: Dr. Marten H. van Kerkwijk University of Toronto N CoI: Dr. Andrei Bykov Ioffe Physical Technical Institute N ------------------------------------------------------------------------------------ Abstract We serendipitously detected a small part of the bow-shock around PSR J0437-4715 in FUV, during our spectroscopic observations of this nearby pulsar. This pulsar is known to be accompanied by a prominent H-alpha bow-shock but, to our surprise, we have discovered its clear counterpart in the FUV image (Figure 1). We are not aware of any instance where both H-alpha and FUV emission are seen from a bow-shock outside the Solar system. The origin of the FUV emission is enigmatic, and the spatial structure of the FUV emission and its relative extent compared to the H-alpha bow are not yet known. We wish to understand the origin of the FUV emission and use both H-alpha and FUV images to constrain the bow-shock physics and the local ISM properties. Using three long-pass filters in the FUV, we will probe the spatially resolved spectrum of the FUV emission and, at the same time, image most of the bow-shock with subarcsecond resolution. We will also obtain a contemporaneous, high-resolution H-alpha image. This, together with knowledge of the pulsar energetics, will allow us to model the emission mechanism and physical conditions throughout the bow-shock, a unique opportunity only available for this object and only using HST's FUV capabilities. ------------------------------------------------------------------------------------ Observations Description ------------------------ We are imaging the faint, extended bow-shock emission in the vicinity of J0437-4715. For such imaging, the final S/N ratio will be dominated by the glow component whose strength depends on the previous SBC usage. Therefore, if at all possible, we ask to schedule our observations in such a way that the SBC has not been used immediately prior to each of our visits. For the FUV imaging, the F115LP and F125LP filters will be used while the spacecraft is in the earth's shadow, in order to avoid the high background associated with geocoronal emission. The F140LP imaging cuts out this emission and does not need to be taken in the shadow. The pointing and orientation of the SBC are chosen such that a) the majority of the bow shock lies on the chip, away from the worst of the detector glow and b) 12917( 3) - 11-Jul-2012 19:41:58 - [ 2] the nearby bright object. The one potentially concerning Bright Object in the field is S2JI010362. In GSC 2.2 it has V=15.13, B-V=0.15. According to http://www.stsci.edu/hst/acs/documents/handbooks/cycle19/c07_obstechniques03.ht ml this object (which is a galaxy) would be dangerous if it were earlier type than A1. However, A1 has B-V=0, and so the object is clearly redder and therefore not a worry. Furthermore, it has B-V=0.83 in NOMAD (0427-0057510) and J-K=1.01 in 2MASS (069.310478), even redder. Additionally, we constrain the SBC detector orientation to ensure that the object is not in the field of view. The orientation and location of the SBC is very similar to our previous observation 10568, for which the nearby galaxy was not a problem. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12917( 3) - 11-Jul-2012 19:41:58 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 2 PSR-J0437-47 ISM, EJECTA, FILAMENT, RA=04H37M15.6434S +/- 0.1", J2000 V = 28 +/- 2 -BOW SHOCK FRONT DEC=-47D15'6.42" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 12917( 3) - 11-Jul-2012 19:41:58 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.265 Line_Spacing 0.187 Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides 69.05 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-SBC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.472 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 44.4 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 12917( 3) - 11-Jul-2012 19:41:58 - [ 5] Visit: 01 Visit Requirements: SCHED 100%; ORIENT 150D TO 236 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PSR-J0437-4 ACS/SBC ACCUM SBC-FIX F115LP 1 1600 S SHADOW; GS ACQ SCENARIO 7-BOW BASE1B3; PATTERN 2 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 PSR-J0437-4 ACS/SBC ACCUM SBC-FIX F140LP 1 724 S 7-BOW ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ PSR-J0437-47-BOW 1 ACS/SBC ACCUM SBC-FIX F115LP 1 none none none 1 N/A PSR-J0437-47-BOW 1 ACS/SBC ACCUM SBC-FIX F115LP 2 none none none 2 N/A PSR-J0437-47-BOW 1 ACS/SBC ACCUM SBC-FIX F115LP 3 none none none 3 N/A PSR-J0437-47-BOW 2 ACS/SBC ACCUM SBC-FIX F140LP 1 none none none 1 N/A PSR-J0437-47-BOW 2 ACS/SBC ACCUM SBC-FIX F140LP 2 none none none 2 737.0 S PSR-J0437-47-BOW 2 ACS/SBC ACCUM SBC-FIX F140LP 3 none none none 3 737.0 S 12917( 3) - 11-Jul-2012 19:41:58 - [ 6] Visit: 02 Visit Requirements: SCHED 100%; ORIENT 150D TO 236 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PSR-J0437-4 ACS/SBC ACCUM SBC-FIX F125LP 1 1600 S SHADOW; GS ACQ SCENARIO 7-BOW BASE1B3; PATTERN 2 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 PSR-J0437-4 ACS/SBC ACCUM SBC-FIX F140LP 1 724 S 7-BOW ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ PSR-J0437-47-BOW 1 ACS/SBC ACCUM SBC-FIX F125LP 1 none none none 1 N/A PSR-J0437-47-BOW 1 ACS/SBC ACCUM SBC-FIX F125LP 2 none none none 2 N/A PSR-J0437-47-BOW 1 ACS/SBC ACCUM SBC-FIX F125LP 3 none none none 3 N/A PSR-J0437-47-BOW 2 ACS/SBC ACCUM SBC-FIX F140LP 1 none none none 1 N/A PSR-J0437-47-BOW 2 ACS/SBC ACCUM SBC-FIX F140LP 2 none none none 2 737.0 S PSR-J0437-47-BOW 2 ACS/SBC ACCUM SBC-FIX F140LP 3 none none none 3 737.0 S 12917( 3) - 11-Jul-2012 19:41:58 - [ 7] Visit: 03 Visit Requirements: SCHED 100% 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 PSR-J0437-4 ACS/WFC ACCUM WFC1 F658N 1 450 S PATTERN 1 1 7-BOW see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ PSR-J0437-47-BOW 1 ACS/WFC ACCUM WFC1 F658N 1 none none none 1 499.0 S PSR-J0437-47-BOW 1 ACS/WFC ACCUM WFC1 F658N 2 none none none 1 499.0 S PSR-J0437-47-BOW 1 ACS/WFC ACCUM WFC1 F658N 3 none none none 1 499.0 S PSR-J0437-47-BOW 1 ACS/WFC ACCUM WFC1 F658N 4 none none none 1 500.0 S 12917( 3) - 11-Jul-2012 19:41:58 - [ 8] Summary Form for Proposal 12917 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures SBC-FIX, WFC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/SBC, ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1B3, ORIENT 150D TO 236 D, PATTERN 1 1, PATTERN 2 1-2, SCHED 100%, SHADOW ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F115LP, F125LP, F140LP, F658N ------------------------------------------------------------------------------------------------------------------------------------ Target Names PSR-J0437-47-BOW ------------------------------------------------------------------------------------------------------------------------------------