May 292015

We are pleased to announce new v0.5 HST mosaics for Epoch 2 of the cluster MACSJ1149.5+2223, from the observations of this target from our Frontier Fields program ID 13504 (PI: J. Lotz). These mosaics complete the full depth obtained on Epoch 2 of this cluster, adding a total of 18, 10 and 42 orbits respectively with ACS F435W, F606W and F814W on the main cluster, along with a total of 24, 12, 10 and 24 orbits respectively with WFC3/IR F105W, F125W, F140W and F160W on the parallel field, thus completing the total exposure time of 70 orbits on each field for this epoch, and 140 orbits total for this cluster. We note that these v0.5 mosaics do not yet include older archival data from before this epoch; this is to help facilitate study of transient phenomena, for which the data from this epoch can be compared with older datasets. These mosaics have all been processed beyond the default pipeline calibration, including correction for time-variable background and persistence effects in WFC3/IR, as well as self-calibration processing for ACS, and astrometric alignment to the previous mosaics that have already been constructed for this cluster. Further details are provided in the readme file, which can be obtained along with all the mosaics at the following location:

More general information about the data for this project can be obtained from our Frontier Fields MAST archive website:

as well as our main Frontier Fields HST project website:

and our Frontier Fields astronomer’s blog and other social media:

We hope that these high-level science products are useful for your research, and we welcome any suggestions or questions that you may have about them.

 Posted by at 4:52 pm

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