16424( 3) - 30-Sep-2020 15:22:36 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16424 Version: 3 Check-in Time: 30-Sep-2020 15:22:36 STScI Edit Number: 0 Title Radio galaxy harassment caught in the act ------------------------------------------------------------------------------------ Type Cycle GO 28 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Ming Sun University of Alabama in Huntsville Y CoI: Chong Ge University of Alabama in Huntsville N CoI: Wenhao Liu University of Alabama in Huntsville N CoI: Dr. William R. Forman Smithsonian Institution Astrophysical N Observatory CoI: Dr. Paul E. J. Nulsen Smithsonian Institution Astrophysical N Observatory CoI: Hao Chen University of Cape Town N CoI: Dr. Craig L. Sarazin The University of Virginia N ------------------------------------------------------------------------------------ Abstract While AGN negative feedback on star formation has become a key ingredient on cosmic structure formation, the importance of AGN positive feedback, induced star formation from jet-cloud interaction, has also be realized. There are few direct examples of AGN positive feedback in the nearby universe. Recently, we have discovered potentially the closest example of AGN positive feedback in a nearby galaxy group where the radio jet of the central galaxy hits a spiral galaxy 154 kpc away in projection to trigger star formation at the side of interaction! As a rare and unique example important to study AGN positive feedback and SF conditions, we request a Chandra observation, along with joint time from VLA and HST, for the necessary multi-wavelength studies. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will observe NGC 3568 with three filters F275W, F475W and F814W in two orbits to study the young stellar population and its relation with the radio plasma of NGC 3557. F475W and F814W observations will be done in one orbit with ACS/WFC, while the F275W observation will be done in another orbit with WFC3/UVIS. The ACS data in two high-throughput filters allow detections of faint features (e.g., individual star cluster associations, dust) and a detailed color map of the galaxy to ~ 12 pc. The F275W data will add important information on the SF in the last several 10^7 years and the F275W - F475W color is a very good age indicator. ------------------------------------------------------------------------------------ 16424( 3) - 30-Sep-2020 15:22:36 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-3568 GALAXY, EMISSION LINE RA=11H10M48.1760S, J2000 V = 12.58 NEBULA, RADIO GALAXY, DEC=-37D26'51.85" SPIRAL, STAR FORMING REGION Reference Frame: Other: SIMBAD Extended: YES Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 16424( 3) - 30-Sep-2020 15:22:36 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 3.034 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.29 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-MOS-DITH-LINE Pattern_Purpose MOSAIC Number_Of_Points 3 Point_Spacing 2.4 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.754 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ 16424( 3) - 30-Sep-2020 15:22:36 - [ 4] Visit: 01 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-3568 ACS/WFC ACCUM WFC F814W 1 337 S (674 PATTERN 1 1-2 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-3568 ACS/WFC ACCUM WFC F475W 1 683 S (1366 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-3568 1 ACS/WFC ACCUM WFC F814W 1 none none none 1 N/A NGC-3568 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A NGC-3568 2 ACS/WFC ACCUM WFC F475W 1 none none none 1 N/A NGC-3568 2 ACS/WFC ACCUM WFC F475W 2 none none none 1 N/A 16424( 3) - 30-Sep-2020 15:22:36 - [ 5] Visit: 02 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-3568 WFC3/UVI ACCUM UVIS-CENT F275W FLASH=20.0 1 843 S PATTERN 2 1 S ER (2529 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-3568 1 WFC3/UVI ACCUM UVIS-CEN F275W 1 none none none 1 N/A S TER NGC-3568 1 WFC3/UVI ACCUM UVIS-CEN F275W 2 none none none 1 N/A S TER NGC-3568 1 WFC3/UVI ACCUM UVIS-CEN F275W 3 none none none 1 N/A S TER 16424( 3) - 30-Sep-2020 15:22:36 - [ 6] Summary Form for Proposal 16424 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER, WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=20.0 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1-2, PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F275W, F475W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-3568 ------------------------------------------------------------------------------------------------------------------------------------