Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21940601f&link_type=abstract
American Astronomical Society, AAS Meeting #219, #406.01
Astronomy and Astrophysics
Astronomy
Scientific paper
The Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS) is designed to document the first third of galactic evolution, from z 8 to z 1.5. It will image >250,000 distant galaxies using three separate cameras on the Hubble Space Telescope from the mid-UV to near-IR and will find and measure Type Ia supernovae beyond z > 1.5 to test their accuracy as standard candles for cosmology. Five premier sky regions are selected, each with extensive multi-wavelength data. The use of five widely separated fields mitigates cosmic variance and yields statistically robust and complete samples of galaxies down to a stellar mass of 109 solar masses at z 2 and to the knee of the UV luminosity function at z 8. The survey covers approximately 800 arcmin2 and is divided into two parts. The CANDELS/Deep survey (5-sigma point-source limit HAB = 27.7 mag) covers 125 arcmin2 within GOODS-N and GOODS-S on ten separate visits. The CANDELS/Wide survey (5-sigma point-source limit HAB 27.0 mag) images all of GOODS and three additional fields (EGS, COSMOS, and UDS) and covers the full area on two visits. Together with the Hubble Ultradeep Fields, this strategy replicates the "wedding cake” approach that has proven effective for extragalactic surveys. Extensive parallel imaging with the Advanced Camera for Surveys creates a new ACS mosaic in UDS, deepens four existing ones, and provides high-resolution Hubble panchromatic imaging from 0.40 m to 1.6 m. Multiple visits to all fields permit variability studies and supernovae searches, and special deep UV observations cover half of GOODS-N. Data from the survey are non-proprietary and are useful for a wide variety of science investigations. In this talk, we review the scientific goals; observational requirements; field selection, geometry, and observing design; schedule; and the public data products.
CANDELS Team
Faber Sandra M.
Ferguson Henry C.
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