Probing Dark Matter and ICM Physics with Observations of the Dissociative Merging Cluster CIZA J0107.7+5408

Scientific Category is a required field. Science Keywords: Select from 2 to 5 items. Small GO Proposals are not allowed in Cycle 26 unless they are Joint Programs. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. 0 Assigned ID: 44 ----- Attempting Submission 1 (Thu Aug 02 13:16:30 GMT 2018) ----- Joint Chandra/HST Adjusted orbits to account for new acqusition overhead. -1661492940 ----- Attempting Submission 1 (Thu Sep 20 17:04:19 GMT 2018) ----- ----- Attempting Submission 2 (Wed Dec 19 22:50:50 GMT 2018) ----- Probing Dark Matter and ICM Physics with Observations of the Dissociative Merging Cluster CIZA J0107.7+5408 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. 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 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. 6 false false false false false false false SUPPORTED CLUSTER OF GALAXIES GALAXY PAIR GRAVITATIONAL LENS RICH CLUSTER J2000 J2000 CLUSTER OF GALAXIES GALAXY PAIR GRAVITATIONAL LENS RICH CLUSTER J2000 ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W POS-TARG DITHER 3.034 LINE false true 4 85.29 ACS-WFC-DITHER-LINE 1

false

POS-TARG DITHER DITHER 2 3.034 ACS-WFC-DITHER-LINE false false 0.149 2 85.29 POS-TARG ACS-WFC-DITHER-LINE 34.35 2

true

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