10483( 5) - 05/18/05 07:51 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 10483 Version: 5 Check-in Date: 18-May-2005 11:50:37 1.Proposal Title: HH110: Collision between a Jet and a Cloud ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle 4. Parallel Pointing Tolerance GO 14 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. Bo Reipurth University of Hawaii CoI: Dr. Alejandro Raga Universidad Nacional Autonoma de Mexico N (UNAM) CoI: Prof. John Bally University of Colorado at Boulder N CoI: Dr. Steve Heathcote National Optical Astronomy Observatories, N AURA CoI: Dr. Angels Riera Universidad de Barcelona N ------------------------------------------------------------------------------------ 6. Abstract We propose to study the shortlived event when a high-velocity protostellar outflow collides with a dense molecular cloud core. It has recently been realized that Herbig-Haro flows can attain gigantic proportions, with flow lobes stretching over many parsecs. This greatly increases the probability that an outflow rams into an obstacle such as a molecular cloud core as it plows through the interstellar medium. The HH 110 flow represents the rare case of an outflow that has suffered a grazing collision with a cloud core. Fortunately, the resulting shock is so bright that only a few orbits are required for analysis. ACS imaging in Halpha in Cycles 12 and 14 will permit the study of detailed structure and kinematics of the flow as it passes through the region of impact. This study has consequences for our general understanding of the energy cycle and chemical processing of the interstellar medium, turbulence in molecular clouds, and the role of sequential star formation among low mass stars. ------------------------------------------------------------------------------------ 10483( 5) - 05/18/05 07:51 - [ 2] Observations Description ------------------------ Due to the 2-gyro mode, we can not re-observe this field with an orientation constraint. Thus, the previously used 200 x 300" will not be used in this observations. Instead, we plan on covering onl;y the200x100" FOV that is provided by ACS. The enitre body of HH110 will fit into this aperture for any orientation. The 4 exposures will consists of the recommentded 3" dither to fill-in the gap between CCDs, augmented by the 2 pixel-diagonal dither to facilitate cosmic-ray and hot-pixel removal. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- I re-submitted the phase II since these comments were not updated in the first submission. ------------------------------------------------------------------------------------ 10483( 5) - 05/18/05 07:51 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HH110 ISM, HERBIG-HARO OBJECT RA=05H51M25.6000S +/- 1", J2000 SURF(6563) = 3 +/-2 E-15 DEC=+02D54'26.00" +/- 1" Coordinate Source: Other_Source: Other Comments: This is a faint HH object, and our positional requirement within the ACS field is about 5 arcsec, so we are not concerned about proper motions. The knots vary greatly in brightness, the surface brightness listed is for a typical knot. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2003.0 0.0 0.0 0.0 10483( 5) - 05/18/05 07:51 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type LINE ACS-WFC-DITHER-LINE Pattern_Purpose MOSAIC DITHER Number_Of_Points 2 2 Point_Spacing 2.994 0.146 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 85.27 47.17 Angle_Between_Sides Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ 10483( 5) - 05/18/05 07:51 - [ 5] Visit: 01 Visit Priority: Visit Requirements: 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 HH110 ACS/WFC ACCUM WFC F658N CR-SPLIT=NO 1 500 S PATTERN 1 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ HH110 1 ACS/WFC ACCUM WFC F658N 1 1 none none 1 544.0 S HH110 1 ACS/WFC ACCUM WFC F658N 1 2 none none 1 544.0 S HH110 1 ACS/WFC ACCUM WFC F658N 2 1 none none 1 544.0 S HH110 1 ACS/WFC ACCUM WFC F658N 2 2 none none 1 544.0 S 10483( 5) - 05/18/05 07:51 - [ 6] Summary Form for Proposal 10483 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F658N ------------------------------------------------------------------------------------------------------------------------------------ Target Names HH110 ------------------------------------------------------------------------------------------------------------------------------------