spacer link to MAST page spacer logo image spacer

PI: Dan Coe (STScI)
Team Page: https://relics.stsci.edu

Introduction

RELICS is obtaining the first HST infrared imaging of 41 massive galaxy clusters to efficiently search for brightly lensed high-redshift galaxies in time for JWST Cycle 1. The clusters include 21 of the 34 most massive known according to Planck. Observations of each cluster are split into two epochs, enabling supernova searches in addition to our high-redshift and cluster science.

For each cluster, we observe to 5-orbit depth with ACS and WFC3/IR. We obtain 3 orbits of ACS imaging in F435W, F606W, and F814W (minus existing archival imaging) and 2 orbits of WFC3/IR imaging in F105W, F125W, F140W, F160W. Five of our clusters require two WFC3/IR pointings. For the 19 clusters with no existing ACS archival imaging, we are also obtaining 3-orbit images of blank parallel fields with WFC3/IR F105W, F125W, F140W, F160W (2 orbits) and WFC3/UVIS F350LP (1 orbit) to search for additional high-redshift candidates as in the BoRG and HIPPIES surveys.

In addition to the Hubble Treasury Program 14096 (PI Coe, STScI), we are obtaining Spitzer imaging of all RELICS clusters (as needed to achieve 5-hour depth in two bands) with Spitzer GO program 12005 (PI Maruša Bradač, UC Davis) and Spitzer DDT program 12123 (PI Tom Soifer, Caltech).

Acknowledgments

When using RELICS HST data, please include this acknowledgment: "This work is based on observations taken by the RELICS Treasury Program (GO 14096) with the NASA/ESA HST, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555."

Data Products

Each cluster contains images, catalogs, and three-color images, organized into subdirectories. For more details, see the "Images" and/or "Catalogs" README files at the top of this page. The color images were produced using Trilogy.

  1. catalogs/
    • _cat.txt = Catalog of sources, using either combined ACS+WFC3/IR or just WFC3/IR images and SExtractor.
    • _probs.txt = Bayesian probabilities for a given redshift for each target. Each row contains the target's ID, followed by the Bayesian probabilities for redshifts between 0.01 and 13.000, in steps of δz = 0.001.
    • _segm.fits = SExtractor segmentation maps.
  2. color_images/
    • _color.fits = Three-color image, consult the README file inside this directory for specific filters used in the three channels of the color image.
    • _color.png = PNG version of the three-color image.
  3. images/30mas-resolution/
    • _drc.fits | _drz.fits = CTE-corrected, drizzled images (drc, for ACS) or drizzled images (drz, for WFC3), at 30 milliarcsecond resolution.
    • _wht.fits = Weight image, at 30 milliarcsecond resolution.
  4. images/60mas-resolution/
    • _drc.fits | _drz.fits = CTE-corrected, drizzled images (drc, for ACS) or drizzled images (drz, for WFC3), at 60 milliarcsecond resolution.
    • _wht.fits = Weight image, at 60 milliarcsecond resolution.
    • _rms.fits = RMS map, at 60 milliarcsecond resolution.

Data Access

Links in the "Images" and "Catalogs" columns take you to the files. Interactive Displays will be available later. Links in the "Color Images" column take you to webpages with preview images, README describing which filters went into the color images, and access to the FITS files.

Cluster Name
(click to sort)
Redshift
(click to sort)
Field Obs.
(click to sort)
Images Color Images Catalogs
RXC J0949.8+1707 0.383 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
RXC J2211.7-0350 0.397 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
RXC J2211.7-0350 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
A1300 0.308 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
A1300 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
RXC J0142.9+4438 0.341 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
RXC J0142.9+4438 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
PSZ2 G138.61-10.84 0.702 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
PSZ2 G138.61-10.84 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
RXC J0911.1+1746 0.505 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
A2163 0.203 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
A1758a 0.280 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
A1763 0.228 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
A1763 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
A2537 0.297 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
WHL J24.3324-8.477 0.566 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
WHL J24.3324-8.477 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
ACT-CLJ0102-49151 0.870 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
RXCJ0232.2-4420 0.284 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
RXCJ0232.2-4420 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
PLCK G308.3-20.2 0.480 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
PLCK G308.3-20.2 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
RXC J0032.1+1808 0.396 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
MACSJ0025.4-1222 0.586 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
PLCK G004.5-19.5 0.540 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
PLCK G004.5-19.5 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
MACSJ0257.1-2325 0.505 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
AS295 0.300 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
A3192 0.425 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
PLCK G171.9-40.7 0.270 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
PLCK G171.9-40.7 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
PSZ2 G209.79+10.23 0.677 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
PSZ2 G209.79+10.23 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
A520 0.203 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
A2813 0.292 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
A2813 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
A665 0.182 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
A665 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
A697 0.282 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
A697 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
SPT-CLJ0254-5857 0.438 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
SPT-CLJ0254-5857 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
MACSJ0159.8-0849 0.405 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
MACSJ0159.8-0849 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
MACSJ0308.9+2645 0.356 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
MACSJ0553.4-3342 0.430 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
RXC J0018.5+1626 0.546 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
CLJ0152.7-1357 0.833 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
RXS J060313.4+4212 0.228 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
MACSJ0035.4-2015 0.352 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
MACSJ0417.5-1154 0.443 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
RXC J0600.1-2007 0.460 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
RXC J0600.1-2007 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
PLCK G287.0+32.9 0.390 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
PLCK G287.0+32.9 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
SPT-CLJ0615-5746 0.972 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
RXC J1514.9-1523 0.223 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
RXC J1514.9-1523 N/A Parallel Field
30mas 60mas Displays
Color Images
Catalog Files
SMACSJ0723.3-7327 0.390 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files
MS1008.1-1224 0.306 Cluster Core
30mas 60mas Displays
Color Images
Catalog Files