ClusterPlan¶
The cluster observations will make use of some main survey hexes/offsets, but only if there is enough cluster area covered. The overlap calculation assumes the FoV to be a circle of 1 degree radius and the cluster to ab a circle of 0.5 degree radius. Survey hexes/offsets are only considered if the overlap is at least 0.5 sq. deg. Giving the hex reference coordinates and the offset pattern, this defines the list of useful main survey pointings. This approach typically provides 5-7 main survey pointings, so I added the missing ones by hand such that all clusters have the full-depth 10 pointings. These "free" pointings all have full overlap with the cluster area and are indicated by "-" signs in the table below.
The CWG has indicated that MACS0329 is the most favorable target (due to it's redshift of 0.45; which is nice as it has 7 main survey hexes), but a lower-z cluster should also be in the list. In terms of re-usable hexes, A383 has 7 and A209 has 6. Both cluster are at redshifts around 0.2.
Public catalogs for the photometry of the CLASH clusters are here: [[http://archive.stsci.edu/prepds/clash/]]. Note that due to the dense environment, even the space-based photometry cannot provide arbitrarily accurate photometry because many galaxies are blended and plenty of ICL is present near the BCGs.
# RA Dec Hex Offset Overlap # MACS0329 52.8653 -2.2698 53-2 8 0.7854 51.9470 -2.2464 52-3 3 0.7854 52.2858 -2.5947 52-3 5 0.7854 52.8169 -1.5973 53-2 0 0.6300 51.6956 -2.3459 52-3 4 0.6051 52.6246 -2.9521 52-3 2 0.5665 52.8973 -2.8795 53-4 1 0.5175 52.1681 -1.9888 - - - 52.0954 -2.5097 - - - 52.7980 -1.9283 - - - # A383 42.2933 -3.6203 42-3 6 0.7854 42.4908 -3.5461 43-4 9 0.7854 41.6224 -3.2298 42-3 0 0.7854 42.2972 -3.9035 43-4 7 0.7854 41.6708 -3.9023 42-3 8 0.7843 42.6805 -3.1469 42-3 2 0.5804 42.3417 -2.7895 42-3 5 0.5403 41.9864 -3.4734 - - - 41.5504 -3.6793 - - - 41.9864 -3.1100 - - - # A209 22.7963 -13.7338 23-14 0 0.7854 22.9254 -13.0447 23-14 4 0.7540 23.5156 -13.2935 23-14 5 0.7056 23.1768 -12.9452 23-14 3 0.6478 23.4672 -14.1243 23-14 6 0.6314 22.8447 -14.4063 23-14 8 0.5444 22.5557 -13.5218 - - - 22.5799 -13.8609 - - - 23.3672 -13.8246 - - - 22.8949 -14.1153 - - - # Bullet 104.4823 -55.6492 104-56 3 0.7854 104.2309 -55.7487 104-56 4 0.7854 104.8211 -55.9975 104-56 5 0.7854 105.1599 -56.3549 104-56 2 0.6949 104.1018 -56.4378 104-56 0 0.6080 105.0678 -55.6705 - - - 104.5712 -56.4094 - - - 105.1163 -55.9612 - - - 104.7287 -55.4767 - - - 104.1836 -56.1308 - - - # MACS0416 64.1368 -23.8308 64-25 3 0.7854 63.8854 -23.9303 64-25 4 0.7854 64.4756 -24.1791 64-25 5 0.7854 63.7563 -24.6194 64-25 0 0.7206 63.2306 -23.8972 64-25 1 0.5261 63.8101 -23.7224 - - - 64.3067 -23.6982 - - - 64.2582 -24.4976 - - - 63.5557 -24.3159 - - - 64.1734 -24.0494 - - -