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| DEEP3 | |
|---|---|
| Name | DEEP3 |
| Type | Spectroscopic Survey |
| Operator | DEEP3 Collaboration |
| Location | Keck Observatory |
| Established | 2010s |
| Wavelength | Optical / Near-infrared |
| Instruments | DEIMOS, MOSFIRE |
| Status | Completed / Ongoing |
DEEP3 DEEP3 is a deep extragalactic spectroscopic survey and follow-up program designed to obtain high-completeness spectra for faint galaxies and active nuclei in selected deep fields. It builds on prior programs to measure redshifts, kinematics, and chemical abundances across cosmic time, linking observational datasets produced by observatories and surveys. DEEP3 coordinates observations, target selection, and data release to integrate results with legacy fields and missions.
DEEP3 integrates observational campaigns using facilities such as the W. M. Keck Observatory, Subaru Telescope, Hubble Space Telescope, Spitzer Space Telescope, and Chandra X-ray Observatory to map galaxies in deep fields like the COSMOS field, GOODS-North, Extended Groth Strip, CANDELS, and Hubble Ultra Deep Field. The program complements multiwavelength surveys including Sloan Digital Sky Survey, Pan-STARRS, UKIDSS, CFHT Legacy Survey, GALEX, and WISE to trace star formation, active galactic nuclei, and large-scale structure. DEEP3's consortium features institutions such as University of California Observatories, Carnegie Institution for Science, Max Planck Institute for Astronomy, Institute for Astronomy (University of Hawaii), and Stanford University.
DEEP3 evolved from precursor projects including DEEP2 Redshift Survey, VVDS, zCOSMOS, and PRIMUS, incorporating lessons from instrument developments like DEIMOS and MOSFIRE at Keck and survey strategies used by 2dFGRS and GAMA (galaxy survey). Influential meetings at institutions such as Space Telescope Science Institute, Harvard-Smithsonian Center for Astrophysics, Max Planck Society, and conferences like the American Astronomical Society symposia catalyzed collaboration formation. Funding and oversight involved agencies and programs including National Science Foundation, NASA, European Southern Observatory, and national research councils in the United Kingdom, Germany, and Japan.
DEEP3 uses multi-object spectrographs such as DEIMOS and MOSFIRE to obtain spectra with resolution and wavelength coverage tuned to detect emission and absorption features like Hα, [O III], and Ca H&K across 0 < z < 4. Target selection draws from catalogs produced by Hubble Space Telescope imaging campaigns (e.g., CANDELS) and ground-based photometry from Subaru Hyper Suprime-Cam, VISTA, and CFHT. Observing strategies reference slitmask design techniques refined in DEEP2 Redshift Survey and calibration practices established for Sloan Digital Sky Survey spectroscopy, while data reduction pipelines adapt algorithms from IRAF, IDL, and Python-based frameworks developed at Lawrence Berkeley National Laboratory and Space Telescope Science Institute.
DEEP3 observations have produced redshift catalogs, spectral line measurements, and kinematic profiles that interface with results from Planck (spacecraft), WMAP, and large-scale structure studies like BOSS and eBOSS. Findings include measurements of the star-formation main sequence consistent with analyses from Herschel Space Observatory and ALMA, constraints on galaxy quenching mechanisms compared with results from MaNGA and SAMI, and AGN demographics that align with X-ray surveys from Chandra X-ray Observatory and XMM-Newton. DEEP3 contributed to improved luminosity functions, stellar mass functions similar to those reported by ZFOURGE and UltraVISTA, and environment-dependent evolutionary trends observed in the COSMOS and CFHTLS fields.
Data processing employs extraction and sky-subtraction procedures inspired by pipelines used for DEEP2 Redshift Survey, SDSS, and VIPERS, with wavelength calibration tied to night-sky lines cataloged by J. B. Oke and standards from Vega and BD+17°4708. Redshift fitting leverages template libraries including spectral models from Bruzual & Charlot and emission-line templates validated against Kennicutt (1998). Analysis workflows use software ecosystems developed at Harvard & Smithsonian, Max Planck Institute for Astrophysics, and open-source tools from the Astropy Project and NumPy community, enabling cross-matching with catalogs from Gaia, 2MASS, and IRAS.
DEEP3 has been used to study galaxy assembly, baryonic processes, and AGN fueling across cosmic time, informing theoretical work from groups at Institute for Advanced Study, Kavli Institute for Cosmology, Princeton University, and Caltech. Its datasets support cosmological analyses that complement measurements from Planck (spacecraft), DES, and LSST (Vera C. Rubin Observatory), and they have guided instrument designs for future projects such as Thirty Meter Telescope, European Extremely Large Telescope, and James Webb Space Telescope observing programs. DEEP3 data releases have enabled cross-disciplinary studies involving teams at Space Telescope Science Institute, Max Planck Institute for Extraterrestrial Physics, and national data centers.
Debates around DEEP3 concern sample selection biases analogous to criticisms leveled at DEEP2 Redshift Survey and zCOSMOS, completeness comparisons with VVDS and PRIMUS, and cosmic variance effects similar to those discussed for GOODS and COSMOS. Limitations include wavelength coverage trade-offs compared to infrared-focused surveys like Spitzer Space Telescope programs and resolution constraints in comparison to integral-field surveys such as MaNGA and SAMI. Discussions at meetings of the American Astronomical Society and panels convened by National Science Foundation and NASA examined these issues alongside strategies used in BOSS and eBOSS to mitigate systematic uncertainties.
Category:Galaxy surveys