The CANDELS Multi-Cycle Treasury Program
The Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS; Grogin et al. 2011; Koekemoer et al. 2011) 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 Ultra Deep Field program (GO 11563), the result is a three-tiered strategy that efficiently samples both bright/rare and faint/common extragalactic objects.
By imaging each field region at least twice on two epochs separated by ~60 days, the program also carries out an extensive search for high-redshift Type Ia SNe beyond z > 1.5. In addition, ultraviolet "daytime" UVIS exposures in GOODS-N exploit the unique CVZ opportunity in that field.
See also the CANDELS Data Release Site on MAST.
Released Products |
Wide: Multidrizzled mosaics from each epoch in each filter;
ultimately summed mosaics from both CANDELS epochs. |
|---|---|
Version Definition |
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. |
Release Schedule |
Wide (2-orbit depth, 2 epochs): 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 "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 cite the following papers:
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Additional Information |
Additional information is available on the CANDELS public web site: |
Latest Data Releases
- The following table lists the most current epoch released in each field
- Click on the field name for a detailed epoch-by-epoch listing of all released data
- Click on the subregion name for tile maps
- Click on the version number to access the data on MAST
| Field | Subregion1 | Epoch1 | Prog ID | Release Date | Documentation | Instrument/Filter | Download |
|---|---|---|---|---|---|---|---|
| GOODS-S | total | ALL |
12060 12061 12062 |
02/07/2013 | WFC3/IR F125W WFC3/IR F125W |
||
| UDS | All | uds01&02 | 12064 | 11/14/2011 | README | WFC3/IR F125W WFC3/IR F160W ACS/WFC F606W ACS/WFC F814W |
v1.0 |
| WFC3/UVIS F350LP | v1.0 | ||||||
| EGS | EGSb | egs02 | 12063 | 09/17/2013 | README | ACS/WFC F606W ACS/WFC F814W WFC3/IR F125W WFC3/IR F160W |
v0.5 |
| WFC3/UVIS F350LP | v0.5 | ||||||
| COSMOS | total | ALL | 12440 | 02/07/2013 | README | ACS/WFC F606W ACS/WFC F814W WFC3/IR F125W WFC3/IR F160W |
v1.0 |
| GOODS-N | Deep JH | gn13 | 12445 | 09/20/2013 | README | ACS/WFC F814W WFC3/IR F105W |
v0.5 |
1 The subregion and epoch number are defined in the observing schedule and tile maps.