HST V1.0 mosaics

HST V1.0 mosaics released for Epoch 2 of Abell 2744

From the webpage:

We are pleased to announce the Version 1.0 release of Epoch 2 of Abell 2744, after the completion of all the ACS and WFC3/IR imaging on the main cluster and parallel field from our Frontier Fields program (13495, PI: J. Lotz), in addition to imaging from programs 11689 (PI: R. Dupke), 13386 (PI: S. Rodney), and 13389 (PI: B. Siana). These v1.0 mosaics have been fully recalibrated relative to the v0.5 mosaics that we have been releasing regularly throughout the course of this epoch during May, June and July 2014. For ACS, the v1.0 mosaics incorporate new bias and dark current reference files, along with CTE correction and bias destriping, and also include a set of mosaics that have been processed with the new selfcal approach to better account for the low-level dark current structure. The WFC3/IR v1.0 mosaics have improved masking for persistence and bad pixels, and in addition include a set of mosaics that have been corrected for time-variable sky emission that can occur during the orbit and can otherwise impact the up-the-ramp count-rate fitting if not properly corrected. Further details are provided in the readme file, which can be obtained along with all the mosaics at the following location:

From Wikipedia on Abell 2744:

Abell 2744, nicknamed Pandora’s Cluster, is a giant galaxy cluster resulting from the simultaneous pile-up of at least four separate, smaller galaxy clusters that took place over a span of 350 million years.[1] The galaxies in the cluster make up less than five percent of its mass.[1] The gas (around 20 percent) is so hot that it shines only in X-rays.[1] Dark matter makes up around 75 percent of the cluster’s mass.[1]

Admittedly the data is over 350 million years out of date but it is the latest data that is currently available. 😉


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