Physics
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hst..prop12440f&link_type=abstract
HST Proposal ID #12440. Cycle 19
Physics
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 1.5 via deep imaging of more than 250,000 galaxies with WFC3/IRand ACS. It will also find the first Type Ia SNe beyond z > 1.5 andestablish their accuracy as standard candles for cosmology. Fivepremier multi-wavelength sky regions selected from the SpitzerExtragalactic Deep Survey {SEDS} provide complementary IRAC imagingdata down to 26.5 AB mag, a unique resource for stellar masses at allredshifts. The use of five widely separated fields mitigates cosmicvariance and yields statistically robust and complete samples ofgalaxies down to 10^9 solar masses out to z 8.The program merges two originally separate MCT proposals. The Faberprogram incorporates a "Wide" imaging survey in three separate fieldsto 2 orbit depth over 0.2 sq. degrees, plus a "Deep" imaging surveyto 12 orbit depth in the two GOODS regions over 0.04 sq. degrees.When combined with ultra-deep imaging from the Hubble Ultradeep Fieldprogram {GO 11563}, the result is a three-tiered strategy that efficientlysamples both bright/rare and faint/common extragalactic objects. TheFerguson program adds an extensive high-redshift Type Ia SNe search,plus ultraviolet "daytime" UVIS exposures in GOODS-N to exploit theCVZ opportunity in that field.This program, GO 12060, is part of the GOODS-S Deep survey. Special Deepscience highlights include: * Detection and counts of early galaxies to z 7-8 as revealed by red-sensitive WFC3-IR images beyond the Lya break - Measurement of the luminosity function of infant galaxies down to 10^9 solar masses out to z = 7-8 - Measurement of the faint-end LF slope to assess the contribution of faint galaxies to cosmic reionization * The physics of early star formation - Propertes of the earliest star-forming regions - sizes, star-formation rates, stellar masses and radiation densities, dust contents - In concert with Spitzer/IRAC data, measurement of the key relation between star-formation rate and stellar mass - what set the rate of early star formation in galaxies? - When did star-formation begin to slow down? In what types of objects? Why? * Structural properties, stellar masses, and environments of the earliest identifiable non-QSO AGN as revealed by WFC3-IR * Structure of highly reddened, dust-obscured galaxies * Deep imaging of the outer envelopes of galaxies - Evidence for galaxy-galaxy interactions; counts of merging galaxies - Growth of the outer envelopes and evolution of structure of spheroidal galaxies * Search for Type Ia SNe to z 2 exploiting the long-wavelength J and H sensitivity of WFC3-IR. The first comprehensive search for Type Ia's at these large distances and early epochs.;
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