15610( 3) - 27-Dec-2018 13:10:23 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15610 Version: 3 Check-in Time: 27-Dec-2018 13:10:23 STScI Edit Number: 0 Title Probing Dark Matter and ICM Physics with Observations of the Dissociative Merging Cluster CIZA J0107.7+5408 ------------------------------------------------------------------------------------ Type Cycle GO 26 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Scott Randall Smithsonian Institution Astrophysical Y Observatory CoI: Dr. Reinout Johannes van Weeren Smithsonian Institution Astrophysical N Observatory CoI: Dr. William Anthony Dawson Lawrence Livermore National Laboratory N CoI: Dr. Tracy Clarke Naval Research Laboratory N CoI: Dr. John ZuHone NASA Goddard Space Flight Center N CoI: Dr. Adi Zitrin Ben Gurion University of the Negev N CoI: Simona Giacintucci Naval Research Laboratory N CoI: Dr. Tony Mroczkowski Naval Research Laboratory N CoI: Dr. Paul E. J. Nulsen Smithsonian Institution Astrophysical N Observatory CoI: Dr. Gabriella Alvarez Smithsonian Institution Astrophysical N Observatory CoI: Andra Stroe European Southern Observatory - Germany N CoI: Dr. Elizabeth Blanton Boston University N CoI: Dr. Gul Bulbul Smithsonian Institution Astrophysical N Observatory ------------------------------------------------------------------------------------ Abstract We propose a deep observation of the massive, low redshift, binary dissociative merging cluster CIZA J0107.7+5408. We will confirm and measure the properties of a merger shock front to constrain the dynamical state of the cluster, and use profiles across the shock front to constrain ICM microphysics. By combining X-ray constraints on the dynamical state with joint HST observations, will provide upper limits on the self-interaction cross section of dark matter competitive with or better than the current best limits. Joint VLA observations will allow us to determine the nature of the diffuse radio emission in this system, and derive shock Mach numbers that can be compared with the X-ray Mach numbers to help understand the formation mechanism of the radio sources. ------------------------------------------------------------------------------------ Observations Description ------------------------ The goal of the joint HST observations is to accurately determine the weak lensing centroid of each subcluster. For this goal, the most efficient strategy is to focus the 15610( 3) - 27-Dec-2018 13:10:23 - [ 2] observations near the presumed centroids, i.e., near the galaxy centroids. Going deep in this area is essential, but covering a wider area is not. F814W is the best filter for deep weak-lensing observations, and this is our primary filter. We need at least one other filter to exclude cluster members and foreground sources from the weak-lensing analysis. The F606W filter straddles the 4000 A break at the relevant redshift (0.19), and so is our choice. We require only one ACS pointing per subcluster. Our experience with similar targets is that two orbits with ACS+F814W is sufficient to obtain a weak-lensing centroid accuracy of 7- 9 arcsec. Given the relatively low redshift of CIZA 0107 (z~0.1) we expect more background sources per square arcmin, but this advantage is largely canceled out by the greater Galactic extinction in this region. Therefore, we ask for two orbits per pointing. Since photometric measurements are less noisy than shape measurements, the source-selection F606W filter need not be as deep as the lensing filter, so we ask for one orbit per pointing with this filter, giving six orbits in total. The target has good visibility with HST at 58 min per orbit. ------------------------------------------------------------------------------------ 15610( 3) - 27-Dec-2018 13:10:23 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 CIZA-J0107.7 CLUSTER OF GALAXIES, RA=01H07M55.4265S, J2000 V = 18 +/- 1 +5408-NE GALAXY PAIR, DEC=+54D10'23.38" GRAVITATIONAL LENS, RICH CLUSTER Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 2 CIZA-J0107.7 CLUSTER OF GALAXIES, RA=01H07M41.6400S, J2000 V = 18 +/- 1 +5408-SW GALAXY PAIR, DEC=+54D06'43.41" GRAVITATIONAL LENS, RICH CLUSTER Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 15610( 3) - 27-Dec-2018 13:10:23 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 3.034 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.29 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE ACS-WFC-DITHER-LINE Pattern_Purpose DITHER DITHER Number_Of_Points 2 2 Point_Spacing 3.034 0.149 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 85.29 34.35 Angle_Between_Sides Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ 15610( 3) - 27-Dec-2018 13:10:23 - [ 5] Visit: 01 (NE Subcluster) Visit Requirements: ORIENT 16.5D TO 77 D; ORIENT 105D TO 164 D; ORIENT 190D TO 256 D; ORIENT 282D TO 341 D On Hold Comments: Additional Comments: The point of the orientation requirements is to avoid nearby bright stars. We have no prefernce between the different roll ranges. 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 CIZA-J0107. ACS/WFC ACCUM WFCENTER F814W 2 600 S PATTERN 2 1 7+5408-NE see below (4800 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 CIZA-J0107. ACS/WFC ACCUM WFCENTER F606W 1 600 S PATTERN 1 2 7+5408-NE see below (2352 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 | ------------------------------------------------------------------------------------------------------------------------------------ CIZA-J0107.7+5408-N 1 ACS/WFC ACCUM WFCENTER F814W 1 1 1 none 1 586.0 S E CIZA-J0107.7+5408-N 1 ACS/WFC ACCUM WFCENTER F814W 1 1 2 none 1 586.0 S E CIZA-J0107.7+5408-N 1 ACS/WFC ACCUM WFCENTER F814W 1 2 1 none 1 586.0 S E CIZA-J0107.7+5408-N 1 ACS/WFC ACCUM WFCENTER F814W 1 2 2 none 1 586.0 S E CIZA-J0107.7+5408-N 1 ACS/WFC ACCUM WFCENTER F814W 2 1 1 none 2 614.0 S E CIZA-J0107.7+5408-N 1 ACS/WFC ACCUM WFCENTER F814W 2 1 2 none 2 614.0 S E CIZA-J0107.7+5408-N 1 ACS/WFC ACCUM WFCENTER F814W 2 2 1 none 2 614.0 S E CIZA-J0107.7+5408-N 1 ACS/WFC ACCUM WFCENTER F814W 2 2 2 none 2 614.0 S E CIZA-J0107.7+5408-N 2 ACS/WFC ACCUM WFCENTER F606W 1 none none none 3 588.0 S E CIZA-J0107.7+5408-N 2 ACS/WFC ACCUM WFCENTER F606W 2 none none none 3 588.0 S E CIZA-J0107.7+5408-N 2 ACS/WFC ACCUM WFCENTER F606W 3 none none none 3 588.0 S E CIZA-J0107.7+5408-N 2 ACS/WFC ACCUM WFCENTER F606W 4 none none none 3 588.0 S E 15610( 3) - 27-Dec-2018 13:10:23 - [ 6] Visit: 02 (SW Subcluster) Visit Requirements: ORIENT 357D TO 74 D; ORIENT 95D TO 157 D; ORIENT 179D TO 249 D; ORIENT 279D TO 340 D On Hold Comments: Additional Comments: The point of the orientation requirements is to avoid nearby bright stars. We have no prefernce between the different roll ranges. 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 CIZA-J0107. ACS/WFC ACCUM WFCENTER F814W 2 600 S PATTERN 2 1 7+5408-SW see below (4800 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 CIZA-J0107. ACS/WFC ACCUM WFCENTER F606W 1 600 S PATTERN 1 2 7+5408-SW see below (2352 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 | ------------------------------------------------------------------------------------------------------------------------------------ CIZA-J0107.7+5408-S 1 ACS/WFC ACCUM WFCENTER F814W 1 1 1 none 1 586.0 S W CIZA-J0107.7+5408-S 1 ACS/WFC ACCUM WFCENTER F814W 1 1 2 none 1 586.0 S W CIZA-J0107.7+5408-S 1 ACS/WFC ACCUM WFCENTER F814W 1 2 1 none 1 586.0 S W CIZA-J0107.7+5408-S 1 ACS/WFC ACCUM WFCENTER F814W 1 2 2 none 1 586.0 S W CIZA-J0107.7+5408-S 1 ACS/WFC ACCUM WFCENTER F814W 2 1 1 none 2 614.0 S W CIZA-J0107.7+5408-S 1 ACS/WFC ACCUM WFCENTER F814W 2 1 2 none 2 614.0 S W CIZA-J0107.7+5408-S 1 ACS/WFC ACCUM WFCENTER F814W 2 2 1 none 2 614.0 S W CIZA-J0107.7+5408-S 1 ACS/WFC ACCUM WFCENTER F814W 2 2 2 none 2 614.0 S W CIZA-J0107.7+5408-S 2 ACS/WFC ACCUM WFCENTER F606W 1 none none none 3 588.0 S W CIZA-J0107.7+5408-S 2 ACS/WFC ACCUM WFCENTER F606W 2 none none none 3 588.0 S W CIZA-J0107.7+5408-S 2 ACS/WFC ACCUM WFCENTER F606W 3 none none none 3 588.0 S W CIZA-J0107.7+5408-S 2 ACS/WFC ACCUM WFCENTER F606W 4 none none none 3 588.0 S W 15610( 3) - 27-Dec-2018 13:10:23 - [ 7] Summary Form for Proposal 15610 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFCENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 105D TO 164 D, ORIENT 16.5D TO 77 D, ORIENT 179D TO 249 D, ORIENT 190D TO 256 D, ORIENT 279D TO 340 D, ORIENT 282D TO 341 D, ORIENT 357D TO 74 D, ORIENT 95D TO 157 D, PATTERN 1 2, PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names CIZA-J0107.7+5408-NE, CIZA-J0107.7+5408-SW ------------------------------------------------------------------------------------------------------------------------------------