RELICS

RELICS obtained 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 detected by Planck , with measured redshifts from the Russian-Turkish 1.5m Telescope. Observations of each cluster were split into two epochs, enabling supernova searches in addition to high-redshift and cluster science.

For each cluster, the team observed to 5-orbit depth with ACS and WFC3/IR. The team obtained 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 the clusters required two WFC3/IR pointings. For the 18 clusters with no existing ACS archival imaging, the team also obtained 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 188-orbit Hubble Treasury Program 14096 (PI Coe, STScI), the team also obtained 945 hours of Spitzer imaging. The team observed 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). Subsequently, the team obtained 30-hour depth Spitzer imaging for 10 RELICS clusters with DDT 13165, DDT 13210, and GO 14017 (PI Bradač).

Catalogs, color images, and monochrome images are available in the MAST Portal and astroquery. Set the 'Provenance Name' filter to RELICS in the Portal Advanced Search to match all observations. The observations can also be retrieved programmatically using the astroquery.mast module. The code example below retrieves all products and allows you to download them via a bash script. Note: total file size is in excess of 600 GB.

from astroquery.mast import Observations
all_obs = Observations.query_criteria(provenance_name="relics")
data_products = Observations.get_product_list(all_obs)
Observations.download_products(data_products, curl_flag=True)

• MAST Portal

  

  A web-based interface for cross-mission searches of data at MAST or the Virtual Observatory

  Portal

• MAST Astroquery

  

  Search for and retrieve 3D-DASH data products programmatically.

  MAST Astroquery

MAST also provides direct downloads of all RELICS products. Lens Model products are only available via direct downloads. Links in the  "Images", "Catalogs", and "Lens Models" columns below take you to the files. Links in the "Color Images" column take you to the fits files with preview images and README describing which filters went into the color images.