The Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey, CANDELS
(Grogin et al. 2011;
Koekemoer et al. 2011),
PI: S. Faber, Co-PI, H. Ferguson,
is designed to document the first third of galactic evolution from z =
8 to 1.5 via deep imaging of more than 250,000 galaxies with WFC3/IR
and ACS. It will also discover and characterize Type Ia SNe beyond z >
1.5 and establish their accuracy as standard candles for cosmology.
The survey targets five premier multi-wavelength sky regions; each has
multi-wavelength data from Spitzer and other facilities plus extensive
spectroscopy of the brighter galaxies. The use of five widely separated
fields mitigates cosmic variance and yields statistically robust and
complete samples of galaxies down to 109 solar masses out to redshift
z ~ 8.
The program incorporates a "Wide" imaging survey to 2-orbit J+H depth
over 720 sq. arcmin in the COSMOS, EGS, and UDS fields. It also
includes a "Deep" imaging survey to ~12 orbit Y+J+H depth in the two
GOODS fields, tiling ~60 sq. arcmin in each field. In combination with
ultra-deep imaging from the Hubble Ultradeep Field program (GO 11563),
the result is a three-tiered strategy that effciently samples both
bright/rare and faint/common extragalactic objects.
By imaging each field region at least twice on two visits separated by
~60 days, the program also carries out an extensive search for
high-redshift Type Ia SNe beyond z > 1.5. Iin addition, ultraviolet
"daytime" UVIS exposures in GOODS-N exploit the unique CVZ opportunity
in that field.
Latest news:May 06, 2013: CANDELS team releases full UDS v1 catalog
The CANDELS team has released the full v1 multi-band catalog of
the UDS field (Galametz et al. 2013), based on the v1.0 HST
WFC3/IR F160W mosaic as the primary detection image. This catalog contains
meaurements for 35932 sources across 19 different wavebands, including the
CANDELS HST data (ACS F606W, F814W and WFC3/IR F125W, F160W) as well as
ground-based optical and near-infrared imaging from CFHT, Subaru, VLT and
UKIRT, and Spitzer/IRAC.
Wide:
Multidrizzled mosaics from each epoch in each filter; ultimately summed mosaics from both CANDELS epochs.
Deep:
Multidrizzled mosaics from each epoch in each filter; ultimately summed mosaics including all CANDELS data from previous epochs.
UVIS:
For the first epoch, single-drizzled tiles are available from the
archive (one exposure per tile with no CR rejection); ultimately summed
mosaics with CR rejection from multiple epochs.
v0.5 represents our best-effort calibration at that time, including bias-stripe and CTE corrections for ACS, but no corrections for WFC3/IR persistence.
v1.0 uses more mature instrument calibration files, improved astrometry where necessary, and persistence corrections for WFC3/IR where applicable.
Release Schedule
Wide (2-orbit depth, 2 visits):
v0.5 three months after each epoch is obtained. v1.0 six months after
the last epoch.
Deep (12-orbit depth, 13 visits, GOODS only):
v0.5 three months after each epoch is obtained. v1.0 six months after
the last epoch.
Acknowledgment
When using data from the CANDELS survey, please include the
following acknowledgement:
"This work is based on observations taken by the CANDELS Multi-Cycle Treasury Program with the NASA/ESA HST, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555."
And please cite both of the following two CANDELS survey papers:
ftp archive.stsci.edu and login as anonymous. cd /pub/hlsp/cosmos. From there you can navigate through the site to find the field and epoch of data of interest.
WGET
You can download whole directories of data using wget commands like:
wget -q -nH --cut-dirs=6 -r -l0 -c -N -np -R 'index*' -erobots=off http://archive.stsci.edu/pub/hlsp/candels/goods-s/gsd15/v0.5/
Image Mosaic Releases:
Field Click for full description of available data