9901( 4) - 05/19/03 10:08 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 9901 Version: 4 Check-in Date: 19-May-2003 10:07:23 1.Proposal Title: HH110: Collision between a Jet and a Cloud ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 12 ------------------------------------------------------------------------------------ 4. 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 ------------------------------------------------------------------------------------ 5. 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. ------------------------------------------------------------------------------------ 9901( 4) - 05/19/03 10:08 - [ 2] Observations Description ------------------------ We will observe the HH 110 in Orion using ACS with the Halpha filter F658N. By using an ORIENT = U3PA = 69 degrees we get the entire flow structure. We are using a nested customized LINE pattern which calls the ACS-WFC-DITHER-LINE as a sub-pattern. This pattern creates a 200 arcsec by 300 arcsec mosaic. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- We have a warning message saying that the 98 arcsec offset we are using in LINE moves the target out of the field of view. This is, however, ok since we are mosaicing and the object position is merely a fiducial point that defines a good position of the whole jet across the field. ------------------------------------------------------------------------------------ 9901( 4) - 05/19/03 10:08 - [ 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=05H51M25.6S +/- 1.0", J2000 SURF(6563)=3+/-2e-15 DEC=+02D54'26.6" +/- 1.0" 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 9901( 4) - 05/19/03 10:08 - [ 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 98.816 0.146 Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 90.0 47.17 Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ 9901( 4) - 05/19/03 10:08 - [ 5] Visit: 01 Visit Priority: Visit Requirements: ORIENT 69.0D TO 69.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HH110 ACS/WF ACCUM WFC F658N CR-SPLIT=NO 1 1230 S PATTERN 1 1 C ------------------------------------------------------------------------------------------------------------------------------------ 9901( 4) - 05/19/03 10:08 - [ 6] Summary Form for Proposal 9901 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 69.0D TO 69.0 D PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F658N ------------------------------------------------------------------------------------------------------------------------------------ Target Names HH110 ------------------------------------------------------------------------------------------------------------------------------------