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The evolution of rest-frame K-band properties of early-type galaxies from z=1 to the present

(2006) ASTROPHYSICAL JOURNAL. 636(1). p.L21-L24
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Abstract
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 similar to 1 with accurately measured dynamical masses. We find that M/L-K evolves as Delta 1n (M/L-K) = (-1.18 +/- 0.10)z, which is slower than in the B band [Delta 1n (M/L-B) = (-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 x 10(11) M-circle dot evolve as Delta 1n (M/L-K) = (-1.01 +/- 0.16)z; less massive galaxies evolve as Delta 1n (M/L-K) = (-1.27 +/- 0.11)z. As expected from stellar population models, the evolution in M/L-K is slower than the evolution in M/L-B. 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.
Keywords
FUNDAMENTAL PLANE, ELLIPTIC GALAXIES, POPULATION SYNTHESIS, LUMINOSITY, EVOLUTION, STELLAR POPULATIONS, FIELD GALAXIES, SPECTROSCOPY, PHOTOMETRY, COMBO-17, REDSHIFT, cosmology : observations, galaxies : evolution, galaxies : formation

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Chicago
van der Wel, Arjen, M Franx, PG van Dokkum, J Huang, HW Rix, and GD Illingworth. 2006. “The Evolution of Rest-frame K-band Properties of Early-type Galaxies from Z=1 to the Present.” Astrophysical Journal 636 (1): L21–L24.
APA
van der Wel, A., Franx, M., van Dokkum, P., Huang, J., Rix, H., & Illingworth, G. (2006). The evolution of rest-frame K-band properties of early-type galaxies from z=1 to the present. ASTROPHYSICAL JOURNAL, 636(1), L21–L24.
Vancouver
1.
van der Wel A, Franx M, van Dokkum P, Huang J, Rix H, Illingworth G. The evolution of rest-frame K-band properties of early-type galaxies from z=1 to the present. ASTROPHYSICAL JOURNAL. 2006;636(1):L21–L24.
MLA
van der Wel, Arjen, M Franx, PG van Dokkum, et al. “The Evolution of Rest-frame K-band Properties of Early-type Galaxies from Z=1 to the Present.” ASTROPHYSICAL JOURNAL 636.1 (2006): L21–L24. Print.
@article{8579105,
  abstract     = {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 similar to 1 with accurately measured dynamical masses. We find that M/L-K evolves as Delta 1n (M/L-K) = (-1.18 +/- 0.10)z, which is slower than in the B band [Delta 1n (M/L-B) = (-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 x 10(11) M-circle dot evolve as Delta 1n (M/L-K) = (-1.01 +/- 0.16)z; less massive galaxies evolve as Delta 1n (M/L-K) = (-1.27 +/- 0.11)z. As expected from stellar population models, the evolution in M/L-K is slower than the evolution in M/L-B. 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.},
  author       = {van der Wel, Arjen and Franx, M and van Dokkum, PG and Huang, J and Rix, HW and Illingworth, GD},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {FUNDAMENTAL PLANE,ELLIPTIC GALAXIES,POPULATION SYNTHESIS,LUMINOSITY,EVOLUTION,STELLAR POPULATIONS,FIELD GALAXIES,SPECTROSCOPY,PHOTOMETRY,COMBO-17,REDSHIFT,cosmology : observations,galaxies : evolution,galaxies : formation},
  language     = {eng},
  number       = {1},
  pages        = {L21--L24},
  title        = {The evolution of rest-frame K-band properties of early-type galaxies from z=1 to the present},
  url          = {http://dx.doi.org/10.1086/499919},
  volume       = {636},
  year         = {2006},
}

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