GEMS: Galaxy evolution from morphologies and SEDs

Hans Walter Rix, Marco Barden, Steven V.W. Beckwith, Eric F. Bell, Andrea Borch, John A.R. Caldwell, Boris Häussler, Knud Jahnke, Shardha Jooee, Daniel H. Mcintosh, Klaus Meisenheimer, Chien Y. Peng, Sebastian F. Sanchez, Rachel S. Somerville, Lutz Wisotzki, Christian Wolf

Research output: Contribution to journalArticlepeer-review

321 Scopus citations


GEMS (Galaxy Evolution from Morphologies and SEDs) is a large-area (800 arcmin 2) two-color (F606W and F850LP) imaging survey with the Advanced Camera for Surveys on the Hubble Space Telescope. Centered on the Chandra Deep Field-South, it covers an area of ∼28′ × 28′, or about 120 Hubble Deep Field areas, to a depth of m AB(F606W) = 28.3(5 σ) and m AB(F850LP) = 27.1(5 σ) for compact sources. In its central ∼1/4, GEMS incorporates ACS imaging from the GOODS project. Focusing on the redshift range 0.2 ≲ z ≲ 1.1, GEMS provides morphologies and structural parameters for nearly 10,000 galaxies where redshift estimates, luminosities, and SEDs exist from COMBO-17. At the same time, GEMS contains detectable host galaxy images for several hundred faint active galactic nuclei. This paper provides an overview of the science goals, the experiment design, the data reduction, and the science analysis plan for GEMS.

Original languageEnglish (US)
Pages (from-to)163-173
Number of pages11
JournalAstrophysical Journal, Supplement Series
Issue number2
StatePublished - Jun 2004

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Galaxies: Bulges
  • Galaxies: Evolution
  • Galaxies: Fundamental parameters galaxies: High-redshift
  • Galaxies: Structure


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