Show simple item record

dc.creatorMartini, Paul
dc.identifier.citationPaul Martini, "A Deep Multicolor Survey. VII. Extremely Red Objects and Galaxy Formation," The Astronomical Journal 121, no. 5 (2001), doi:10.1086/320375en_US
dc.description.abstractExtremely red objects (EROs) offer a window to the universe at z ~ 1 analogous to that provided by the Lyman break galaxies at z = 3. Passive evolution and hierarchical galaxy formation models make very distinct predictions for the K (2.2 μm) surface density of galaxies at z ~ 1, and EROs are a powerful constraint on these theories. I present a study of nine resolved EROs with R-K ≥ 5.3 and K ≤ 18 mag found in the 185 arcmin^2 of the Deep Multicolor Survey with near-infrared imaging. Photometric redshifts for these galaxies show they all lie at z = 0.8–1.3. The relatively blue J-K colors of these galaxies suggest that most are old elliptical galaxies rather than dusty starbursts. The surface density of EROs in this survey (>0.05 arcmin^-2), which is a lower limit to the total z ~ 1 galaxy surface density, is an order of magnitude below the prediction of passive galaxy evolution, yet over a factor of 2 higher than the hierarchical galaxy formation prediction for a flat, matter-dominated universe. A flat, Λ-dominated universe may bring the hierarchical galaxy formation model into agreement with the observed ERO surface density.en_US
dc.publisherAmerican Astronomical Societyen_US
dc.subjectcosmology: observationsen_US
dc.subjectgalaxies: evolutionen_US
dc.subjectgalaxies: formationen_US
dc.subjectgalaxies: photometryen_US
dc.titleA Deep Multicolor Survey. VII. Extremely Red Objects and Galaxy Formationen_US

Files in this item


Items in Knowledge Bank are protected by copyright, with all rights reserved, unless otherwise indicated.

This item appears in the following Collection(s)

Show simple item record