Jun 112016
 

We are pleased to announce new v0.5 HST mosaics for Epoch 2 of the cluster Abell S1063, completing the 70 orbits of observations from Epoch 2 of our Frontier Fields program (14037, PI.: J. Lotz), adding 22 orbits with WFC3/IR on the main cluster, and with ACS on the parallel field, in addition to existing public archival ACS and WFC3/IR imaging obtained in these filters from programs 12458 (PI.: M. Postman) and 13459 (PI.: T. Treu). The products released here are the most complete full-depth mosaics in these filters, where all data have been fully reprocessed using the most current calibration files, to produce the best possible quality, science-ready full-depth mosaics. For ACS, these mosaics incorporate CTE correction and bias destriping, as well as a set of mosaics that have been processed with the new selfcal approach to better correct for low-level dark current structure. The WFC3/IR mosaics have been masked 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. All these mosaics are aligned to a common pixel grid as well as to an absolute astrometric frame based on pre-existing catalogs of this field. 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 5:02 pm
Apr 102016
 

We are pleased to announce the Version 1.0 release of Epoch 1 of Abell 370, after the completion of all the ACS and WFC3/IR imaging for this epoch on the main cluster and parallel field from our Frontier Fields program (14038, PI: J. Lotz). These mosaics complete the full depth of Epoch 1 obtained with ACS F435W, F606W and F814W on the main cluster, along with WFC3/IR F105W, F125W, F140W and F160W on the parallel field, and also include public archival ACS and WFC3/IR imaging obtained in these filters from programs 11108 (PI.: E. Hu), 11507 (PI.: K. Noll), 11591 (PI.: J.-P. Kneib), 13459 (PI.: T. Treu), 13790 (PI.: S. Rodney), and 14216 (PI.: R. Kirshner). All the mosaics in this v1.0 release have been fully recalibrated relative to the v0.5 mosaics that we released during this epoch. 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:

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 12:33 pm
Mar 252016
 

We are pleased to announce the Version 1.0 release of Epoch 1 of Abell S1063, after the completion of all the ACS and WFC3/IR imaging on the main cluster and parallel field from our Frontier Fields program (14037, PI: J. Lotz). These mosaics complete the full depth of Epoch 1 obtained with ACS F435W, F606W and F814W on the main cluster, along with WFC3/IR F105W, F125W, F140W and F160W on the parallel field, including also all the public archival ACS and WFC3/IR imaging obtained in these filters from programs 12458 (PI.: M. Postman) and 13459 (PI.:T. Treu). All the mosaics in this v1.0 release have been fully recalibrated relative to the v0.5 mosaics that we released during this epoch. 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:

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 12:11 pm
Jan 212016
 

We are pleased to announce the v0.5 release of the new HST mosaics obtained for epoch 1 on the cluster Abell 370, from the first 46 orbits of observations of this target from our ongoing Frontier Fields program ID 14038 (PI: J. Lotz), also including public archival ACS and WFC3/IR imaging data from programs 11108 (PI: E. Hu), 11507 (PI: K. Noll), 11591 (PI: J.-P. Kneib), and 13459 (PI: T. Treu). These have all been combined to provide the most complete full-depth mosaics in the ACS/WFC and WFC3/IR filters that are used for the Frontier Fields program, where all data have been fully reprocessed using the most current calibration files. These mosaics have all been processed beyond the default pipeline calibration, in order to produce the best possible quality, science-ready full-depth mosaics. For ACS, these mosaics incorporate CTE correction and bias destriping, as well as a set of mosaics that have been processed with the new selfcal approach to better correct for low-level dark current structure. The WFC3/IR mosaics have been masked 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. All these mosaics are aligned to a common pixel grid as well as to an absolute astrometric frame based on pre-existing catalogs of this field. Further details are provided in the readme file, which can be obtained along with all the mosaics at the following link:

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 5:43 pm
Nov 282015
 

We are pleased to announce the v0.5 release of the new HST mosaics obtained for epoch 1 on the cluster Abell S1063, from the first 50 orbits of observations of this target from our Frontier Fields program ID 14037 (PI: J. Lotz), which also includes archival ACS and WFC3/IR data (programs 12458, PI.: M. Postman, and and program 13459, PI.: T. Treu), to provide the most complete full-depth mosaics in the ACS/WFC and WFC3/IR filters that are used for the Frontier Fields program, where all data have been fully reprocessed using the most current calibration files. These mosaics have all been processed beyond the default pipeline calibration, in order to produce the best possible quality, science-ready full-depth mosaics. For ACS, these mosaics incorporate CTE correction and bias destriping, as well as a set of mosaics that have been processed with the new selfcal approach to better correct for low-level dark current structure. The WFC3/IR mosaics have been masked 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. All these mosaics are aligned to a common pixel grid as well as to an absolute astrometric frame based on pre-existing catalogs of this field. Further details are provided in the readme file, which can be obtained along with all the mosaics at the following link:

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 7:24 pm
Jul 022015
 

We are pleased to announce the Version 1.0 release of Epoch 2 of MACSJ1149.5+2223, after the completion of all the ACS and WFC3/IR imaging on the main cluster and parallel field from our Frontier Fields program (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. In addition, we release updated WFC3/IR mosaics on the main cluster that include new archival WFC3/IR from program 13790 (PI.: S. Rodney). All the mosaics in this v1.0 release have been fully recalibrated relative to the v0.5 mosaics that we have released during this epoch in May 2015. 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:

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 2:05 pm
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
Apr 032015
 

We are pleased to announce new v0.5 HST mosaics for Epoch 2 of the cluster MACSJ0717.5+3745, from the observations of this target from our Frontier Fields program ID 13498 (PI: J. Lotz). These mosaics complete the full depth obtained on the second epoch of this cluster, adding a further 42 orbits of WFC3/IR imaging in F105W, F125W, F140W and F160W on the main cluster, along with ACS imaging in F435W and F814W on the parallel field, and completing the total exposure time of 70 orbits on each field for this epoch, and 140 orbits total for this cluster. We have combined these data with archival data from program ID 12103 (PI: M. Postman), 13389 (PI: B. Siana), and 13459 (PI.: T. Treu), to create mosaics that are intended to contain the full depth of WFC3/IR data on the main cluster and ACS data on the parallel field. 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:

Since the observations for this cluster are now complete, we have started preparing the v1.0 release which will be available in a few weeks, once updated calibration reference files have been prepared by the instrument teams, and which will be announced once it is released.

In addition, we are starting to prepare for v2.0 releases for all the Frontier Fields clusters that are complete, including Abell 2744 and MACS J0416.1-2403, to be followed by MACS J0717.5+3745 and the subsequent clusters once these are complete. These v2.0 releases will contain a variety of processing and calibration improvements relative to the current v1.0 releases, including:

  •   Improved removal of low-level background flatfield residuals
  •   Improved astrometry, including new time-dependent distortion models
  •   Reprocessing using the latest ACS self-calibration algorithms and updated WFC3/IR time-variable background removal for all data
  •   Improved masking and removal of persistence in the WFC3/IR data
  •   Consolidating all ACS and WFC3 imaging for each cluster (including more recent data, if publicly available) into full-depth mosaics.

These v2.0 releases will be distributed in the coming months, as soon as the above processing improvements are complete, and will also be subsequently carried out on the remaining Frontier Fields clusters once their observations are complete.

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 11:17 am
Mar 242015
 

We are pleased to announce the first new v0.5 HST mosaics for Epoch 2 of the cluster MACSJ0717.5+3745, from the observations of this target from our Frontier Fields program ID 13498 (PI: J. Lotz). In this second epoch, the orientation of HST enables the instruments to be swapped, in order to obtain WFC3/IR imaging on the main cluster field and ACS imaging on the parallel field, with a total of 28 orbits so far that have been obtained from this program during this epoch. We have combined these data with archival data from programs 12103 (PI: M. Postman), 13389 (PI: B. Siana), and 13459 (PI.: T. Treu), to create mosaics that are intended to contain the full depth of WFC3/IR data on the main cluster and ACS data on the parallel field. 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 8:47 am