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Galaxy formation and evolution at redshifts z>1

The FourStar Galaxy Evolution Survey (ZFOURGE) is a large and deep medium-band imaging survey aimed at establishing an observational benchmark of galaxy properties at redshift z > 1. ZFOURGE survey is carried out using an extremely efficient near-infrared FOURSTAR instrument on the Magellan telescope, in three HST legacy fields: COSMOS, CDFS, and UDS.

Accurate redshifts for ~60,000 galaxies at z>1

Most normal L* galaxies at 1 < z < 3 are too faint for spectroscopic observations, which has forced us to rely on inaccurate broadband photometric redshifts in the past. In response, we have equipped FourStar with innovative “medium-bandwidth” filters from 1 − 1.8μm (see Figure), which enable accurate and robust redshifts with ~2% accuracy for ~60,000 galaxies.

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This GIF shows the increased sampling of a galaxy SED (C: Adam Tomczak).

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The dependence of the number density of satellites on star-formation activity and stellar mass.
Representative examples of the spectral energy distributions of the quiescent galaxies.
UV luminosity function of galaxies at z~7.
Observed stacked SEDs for the mass-limited z = 3 - 4 ZFOURGE galaxies.
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Regions on a piece of a sky where there are dense concentrations of galaxies.
We greatly acknowledge support from the Carnegie Observatories and the staff at the Las Campanas observatories during this survey.
We greatly acknowledge support from the Carnegie Observatories and the staff at the Las Campanas observatories during this survey.