Summary of Data in the AEGIS Survey

This page contains an overview of the AEGIS collaboration data sets. It includes a brief introduction to the data (taken from the Davis et al. 2007 introduction to the AEGIS ApJ Letters Special Issue), followed by tables summarizing the imaging and spectroscopic data included in the AEGIS survey. Following these is a table that summarizes higher level data products (ie. photometric redshifts, stellar masses, morphologies) derived from the original data by members of the AEGIS team.

If you use data from one of these data sets, please include this acknowledgement:

"This study makes use of data from AEGIS, a multiwavelength sky survey conducted with the Chandra, GALEX, Hubble, Keck, CFHT, MMT, Subaru, Palomar, Spitzer, VLA, and other telescopes and supported in part by the NSF, NASA, and the STFC."

For a more thorough summary of the AEGIS collaboration data sets, see the Davis et al. introduction to the AEGIS ApJ Letters Special Issue.
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Introduction to the Data Set

The All-Wavelength Extended Groth Strip International Survey (AEGIS) is a collaborative effort to obtain both deep imaging covering all major wavebands from X-ray to radio and optical spectroscopy over a large area of sky (0.5 - 1 deg2) with the aim of studying the panchromatic properties of galaxies over the last half of the Hubble time. The region studied, the Extended Groth Strip (EGS: α=14h17m, δ=+52°30') is an extension of and owes its name to a Hubble Space Telescope (HST) survey consisting of 28 Wide-Field Planetary Camera 2 (WFPC2) pointings carried out in 1994 by the WFPC team (Rhodes, Refregrier, & Groth 2000). This field benefits from low extinction, low Galactic and zodiacal infrared emission, and good schedulability by space-based observatories, and has therefore attracted a wide range of deep observations at essentially every accessible wavelength over this comparatively wide field.

Amongst deep multiwavelength fields, the EGS field provides a unique combination of area and depth at almost every waveband observable. It is two (HST) to four (for Spitzer and Chandra) times larger than the combined GOODS fields (Giavalisco et al. 2004), yet has a similar range of wavelength coverage, making it ideal for studying rare classes of objects that may be absent in smaller fields. The GEMS field (Rix et al. 2004) covers a similar area to similar depths, but was studied by the COMBO-17 photometric redshift survey rather than a spectroscopic survey. Most AEGIS data sets cover ~0.5 - 1 deg2, considerably smaller than the 2 deg2 COSMOS field (Koekemoer & Scoville 2005). However, AEGIS observations are deeper at most wavelengths, benefiting from greater schedulability and lower backgrounds. Spectroscopy of the COSMOS field is in progress, but will not be completed for 3 - 5 years. An additional advantage of AEGIS is that deep HST/ACS imaging is available in two bands (F606W and F814W), whereas the COSMOS field has been observed in F814W only, while the F850LP imaging in GEMS is too shallow to study subcomponent colors for most galaxies.

Data from DEEP2 are a linchpin for almost all AEGIS studies, providing redshifts; internal kinematics for dynamical masses; line strengths for star formation rates, AGN identification, and gas-phase metallicities; stellar population ages and metallicites; etc.. The precision and relatively dense sampling of DEEP2 redshifts allow for accurate measurement of the local environment of objects in EGS, which is a major factor driving galaxy evolution. Other surveys at similar redshifts provide weaker environmental measures due to larger redshift errors, lower sampling rates, and/or smaller areas (Cooper et al. 2005). Furthermore, we can remove cosmic variance fluctuations from observed AEGIS abundances by comparing redshift distributions to the other three, widely-separated DEEP2 fields. Ten instrument teams and a number of theorists are now collaborating on AEGIS—nearly 100 scientists in half a dozen countries.

Imaging Data Summary Table
Data Set
(w/ Link to Data Access)
Band PSF Limiting
(typically 5σ)
Area Contact
Chandra / ACIS 1-10 keV 0.5"-6.0" 200 ksec 17' x 120' K. Nandra
Chandra / ACIS (AEGIS-X) 1-10 keV ? 800 ksec 17' x 40' K. Nandra
GALEX UDeep imaging FUV 5.5" 25 (AB) [3σ] 1.25° diam S. Salim
NUV 5.5" 25 (AB) [3σ] 1.25° diam
GALEX grism FUV ? 291 ksec 1.25° diam C. Martin
NUV 5.5" 291 ksec 1.25° diam
HST / ACS F606W (V) 0.1" 28.75 (AB) 10' x 67' J. Lotz
F814W (I) 0.1" 28.10 (AB) 10' x 67'
HST / NICMOS F110W (J) 0.35" 25.7 (AB) [10σ] 0.0128 deg2 S. Kassin
F160W (H) 0.35" 28.10 (AB) [10σ] 0.0128 deg2
CFHT 8K x 12K B 1" 24.5 (AB) [8σ] 4 x 28' x 42' J. Newman, A. Coil
R 1" 24.2 (AB) [8σ] 4 x 28' x 42'
I 1" 23.5 (AB) [8σ] 4 x 28' x 42'
CFHT/Megacam (CFHTLS) u* <1.1" ~ 27 (AB) 1 deg2 S. Gwyn
g' <1.0" 28.3 (AB) 1 deg2
r' <0.9" ~27.5 (AB) 1 deg2
i' <0.9" ~27 (AB) 1 deg2
z' <0.9" 26.4 (AB) 1 deg2
MMT Megacam u' ? 26.2 (AB) 1 deg2 M. Ashby
g' ? 27.2 (AB) 1 deg2
r' ? 26.0 (AB) 1 deg2
i' ? 26.0 (AB) 1 deg2
Palomar / WIRC J 1" 23.9 (AB) 0.2 deg2 K. Bundy
Ks 1" 21.7-22.5 (AB) 0.7 deg2
IRAC 1 (3.6 μm) 1.8" 0.9 μJy 10' x 120' P. Barmby
2 (4.5 μm) 2.0" 0.9 μJy 10' x 120'
3 (5.8 μm) 2.2" 6.3 μJy 10' x 120'
4 (8.0 μm) 2.2" 5.8 μJy 10' x 120'
MIPS GTO 24 μm 5.9" 77 μJy 10' x 120' J.-S. Huang
70 μm 19" 10.3 mJy 10' x 120'
MIPS FIDEL 24 μm 5.9" 30 μJy 10' x 90' M. Dickinson
70 μm 19" 3 mJy 10' x 90'
160 μm ? 20 mJy 10' x 90'
SCUBA2 Legacy Deep 850 μm ? 3.5 mJy 1 deg2 R. Ivison
VLA 6 cm 1.2" 0.6 mJy beam-1 30' x 80' S. Willner
VLA 20 cm 4.2" 100 μJy beam-1 30' x 80' R. Ivison
Spectroscopic Data Summary Table
Telescope/Instrument Wavelength Range Spec. Res. Spatial PSF Lim. Mag Area # Targ Exp Time
(Mode) (Å) (FWHM) (deg-2) (ks)
Keck/DEIMOS 6400-9100 1.4 0.6”-1.0” R=24.1 (AB) 0.5 17,600 3.6
Derived Data Products
Measurement Field Data Sets Used Contact Email @
K-corrections DEEP2 CFHT BRI, DEEP2 Willmer cnaw
Environment Measures DEEP2 DEEP2 Cooper cooper
Group Catalog DEEP2 DEEP2 Gerke bgerke
K/A Decomposition & EW Measurements DEEP2 DEEP2 Yan renbin
EW & Velocity Dispersion Measurements DEEP2 DEEP2 Weiner bjw
Standard EWs DEEP2 DEEP2 Konidaris npk
SFR measures EGS DEEP2, Spitzer, Galex Noeske kai
Stellar Masses Palomar K DEEP2, Palomar-J,K Bundy kbundy
Stellar Masses DEEP2 DEEP2, Bundy catalog Willmer cnaw
Photo-z EGS DEEP2, Spitzer Huang jhuang
Photo-z DEEP Fields 2, 3, 4 DEEP2, z-band data Lin lihwai
GALFIT EGS HST/ACS Griffith, Cooper, Newman cooper
GIM2D EGS HST/ACS Simard Luc.Simard
G/M20 EGS HST/ACS Lotz lotz
Visual Morphologies EGS Red Galaxies HST/ACS, zs, K-corrections Konidaris npk
Rotation Curves EGS DEEP2 Weiner, Kassin kassin
Hydrogen Column Density EGS Chandra + zs Elise Laird e.laird
Intrinsic X-Ray Luminosity EGS Chandra + zs Elise Laird e.laird