The current catalog release, v4.1 is a Ks-selected catalog of the COSMOS field based on the imaging from the DR1 UltraVISTA release.  The catalog covers a total area of 1.62 deg2, and has photometry in 30 bands including the GALEX, Subaru, CFHT, UltraVISTA, and Spitzer imaging.  The 90% completeness limit of the survey is Ks,tot = 23.4 AB.  Photometry has been determined in a color aperture by PSF matching all bands, including additional source-fitting for the large-PSF space-based imaging such as GALEX and IRAC/MIPS.

Stellar masses and other population parameters are calculated for all galaxies using the FAST code.  These are determined from fitting the SEDs of the galaxies to models such as Bruzual & Charlot (2003) and Maraston (2005).  FAST also outputs stellar population parameters such as ages and star formation rates.  All of the best-fit SEDs from the FAST fits are available in the data products page.

Photometric redshifts for galaxies have been calculated using the EAZY code.  The agreement between the photometric redshifts and spectroscopic redshifts from the literature such as zCOSMOS is excellent, with an outlier fraction of 1.56% and an RMS of dz/(1+z) = 0.013.

Photometric Redshifts

Catalog Overview

Stellar Masses

Rest-frame colors for galaxies have been calculated with EAZY.  The UVJ color space in UltraVISTA shows evidence of the galaxy bimodality up to z~2, but thereafter it becomes much less pronounced.

Rest-Frame Colors

UV luminosities have been calculated using EAZY, and IR luminosities have been measured from the MIPS 24 micron data.  The IR luminosities do not use the IRAS-based luminosity-dependent templates but use a template-averaging method.  Galaxies in UltraVISTA show a clear star formation “main sequence” up to z = 2.5

UV+IR Luminosities and SFRs