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
May 192015
 

We are pleased to announce the Version 1.0 release of Epoch 2 of the cluster MACSJ0717.5+3745, after the completion of the full total of 140 orbits of WFC3/IR and ACS imaging on the main cluster and parallel field from our Frontier Fields program (13498, PI: J. Lotz), as well as including archival data from program ID 12103 (PI: M. Postman), 13389 (PI: B. Siana), and 13459 (PI.: T. Treu). These v1.0 mosaics have been fully recalibrated relative to the v0.5 mosaics that we have been releasing during this epoch in March and April 2015. For ACS, the v1.0 mosaics incorporate new bias and dark current reference files, created with the new postflash approach to improve low-level noise, 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:

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 8:24 am