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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308540.0, MPI für Astronomie / Publikationen_mpia
The evolution of rest-frame K-band properties of early-type galaxies from z = 1 to the present1
Authors:van der Wel, A.; Franx, M.; van Dokkum, P. G.; Huang, J.; Rix, H. W.; Illingworth, G. D.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:The Astrophysical Journal
Start Page:L21
End Page:L24
Audience:Not Specified
Abstract / Description:We measure the evolution of the rest-frame K-band fundamental plane from z=1 to the present by using IRAC imaging of a sample of early-type galaxies in the Chandra Deep Field-South at z~1 with accurately measured dynamical masses. We find that M/LK evolves as Deltaln(M/LK)=(-1.18+/-0.10)z, which is slower than in the B band [Deltaln(M/LB)=(-1.46+/-0.09)z]. In the B band, the evolution has been demonstrated to be strongly mass-dependent. In the K band, we find a weaker trend: galaxies more massive than M=2×1011 Msolar evolve as Deltaln(M/LK)=(-1.01+/-0.16)z less massive galaxies evolve as Deltaln(M/LK)=(-1.27+/-0.11)z. As expected from stellar population models, the evolution in M/LK is slower than the evolution in M/LB. However, when we make a quantitative comparison, we find that the single-burst Bruzual-Charlot models do not fit the results well, unless large dust opacities are allowed at z=1. Models with a flat IMF fit better; Maraston models with a different treatment of AGB stars fit best. These results show that the interpretation of rest-frame near-IR photometry is severely hampered by model uncertainties and therefore that the determination of galaxy masses from rest-frame near-IR photometry may be harder than was thought before. Based on observations with the Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555. Based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory under NASA contract 1407.
Free Keywords:Cosmology: Observations; Galaxies: Evolution; Galaxies: Formation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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