17242( 3) - 07-Dec-2023 16:55:43 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17242 Version: 3 Check-in Time: 07-Dec-2023 16:55:43 STScI Edit Number: 0 Title Resolving an orphan cloud as a signpost of ICM clumping ------------------------------------------------------------------------------------ Type Cycle GO 30 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Ming Sun University of Alabama in Huntsville Y CoI: Dr. RONGXIN LUO University of Alabama in Huntsville N CoI: Pavel Jachym Astronomical Institute, Academy of N Sciences of CR CoI: Dr. Masafumi Yagi National Astronomical Observatory of Japan N (NAOJ) CoI: Dr. Alessandro Boselli Laboratoire d'Astrophysique de Marseille N CoI: Dr. Matteo Fossati Universita di Milano-Bicocca N CoI: Dr. Paul E. J. Nulsen Smithsonian Institution Astrophysical N Observatory CoI: Dr. Craig L. Sarazin The University of Virginia N CoI: Dr. Thomas C Scott Universidade do Porto N CoI: Dr. Elias Brinks University of Hertfordshire N ------------------------------------------------------------------------------------ Abstract A first and only known isolated (or galaxy-less) cloud detected in Ha, CO and X-rays was discovered in the nearby galaxy cluster A1367. This discovery provides a firm connection between the clumps in the intracluster medium (ICM) and the stripped gas from infall galaxies. This case suggests that at least some ICM clumps are multi-phase in nature. The cloud presents a great laboratory to study the evolution of the stripped ISM far away from the parent galaxy and ICM clumps in details. We request joint Chandra, HST and VLA observations to 1) look for a sharp edge in X-rays; 2) study the central orphan X-ray cool core; 3) resolve X-ray point sources; 4) study SF history and conditions; and 5) search for HI gas around the cloud. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will observe the orphan cloud in A1367 with three filters F275W, F475W and F814W in two orbits to search for star formation and features indicative of ram pressure stripping. 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). 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. ------------------------------------------------------------------------------------ 17242( 3) - 07-Dec-2023 16:55:43 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 A1367-OC-ACS CLUSTER OF GALAXIES, RA=11H44M25.8060S, J2000 V = 16 EMISSION LINE NEBULA, DEC=+20D10'26.57" RICH CLUSTER, 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 ------------------------------------------------------------------------------------------------------------------------------------ 2 A1367-OC-WFC CLUSTER OF GALAXIES, RA=11H44M24.7000S, J2000 V = 16 3 EMISSION LINE NEBULA, DEC=+20D10'19.60" RICH CLUSTER, 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 ------------------------------------------------------------------------------------------------------------------------------------ 17242( 3) - 07-Dec-2023 16:55:43 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 17242( 3) - 07-Dec-2023 16:55:43 - [ 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 A1367-OC-AC ACS/WFC ACCUM WFCENTER F814W 1 337 S (674 PATTERN 1 1-2 S S) ------------------------------------------------------------------------------------------------------------------------------------ 2 A1367-OC-AC ACS/WFC ACCUM WFCENTER F475W 1 662 S S see below (1323 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 | ------------------------------------------------------------------------------------------------------------------------------------ A1367-OC-ACS 1 ACS/WFC ACCUM WFCENTER F814W 1 none none none 1 N/A A1367-OC-ACS 1 ACS/WFC ACCUM WFCENTER F814W 2 none none none 1 N/A A1367-OC-ACS 2 ACS/WFC ACCUM WFCENTER F475W 1 none none none 1 661.0 S A1367-OC-ACS 2 ACS/WFC ACCUM WFCENTER F475W 2 none none none 1 N/A 17242( 3) - 07-Dec-2023 16:55:43 - [ 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 A1367-OC-WF WFC3/UVI ACCUM UVIS-CENT F275W FLASH=20 1 830 S PATTERN 2 1 C3 S ER see below (2488 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 | ------------------------------------------------------------------------------------------------------------------------------------ A1367-OC-WFC3 1 WFC3/UVI ACCUM UVIS-CEN F275W 1 none none none 1 829.0 S S TER A1367-OC-WFC3 1 WFC3/UVI ACCUM UVIS-CEN F275W 2 none none none 1 829.0 S S TER A1367-OC-WFC3 1 WFC3/UVI ACCUM UVIS-CEN F275W 3 none none none 1 N/A S TER 17242( 3) - 07-Dec-2023 16:55:43 - [ 6] Visit: 03 Visit Requirements: On Hold Comments: Additional Comments: re-observation for visit 01 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 A1367-OC-AC ACS/WFC ACCUM WFCENTER F814W 1 337 S (674 PATTERN 1 1-2 S S) ------------------------------------------------------------------------------------------------------------------------------------ 2 A1367-OC-AC ACS/WFC ACCUM WFCENTER F475W 1 652 S S (1304 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 | ------------------------------------------------------------------------------------------------------------------------------------ A1367-OC-ACS 1 ACS/WFC ACCUM WFCENTER F814W 1 none none none 1 N/A A1367-OC-ACS 1 ACS/WFC ACCUM WFCENTER F814W 2 none none none 1 N/A A1367-OC-ACS 2 ACS/WFC ACCUM WFCENTER F475W 1 none none none 1 N/A A1367-OC-ACS 2 ACS/WFC ACCUM WFCENTER F475W 2 none none none 1 N/A 17242( 3) - 07-Dec-2023 16:55:43 - [ 7] Summary Form for Proposal 17242 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER, WFCENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=20 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1-2, PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F275W, F475W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names A1367-OC-ACS, A1367-OC-WFC3 ------------------------------------------------------------------------------------------------------------------------------------