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Comparing dynamical and photometric mass estimates of low- and high-redshift galaxies : random and systematic uncertainties

(2006) ASTROPHYSICAL JOURNAL. 652(1). p.97-106
Author
Organization
Abstract
We determine the importance of redshift-dependent systematic effects in the determination of stellar masses from broadband spectral energy distributions (SEDs), using high-quality kinematic and photometric data of early-type galaxies at z similar to 1 and z similar to 0. We find that photometric masses of z similar to 1 galaxies can be systematically different, by up to a factor of 2, from photometric masses of z similar to 0 galaxies with the same dynamical mass. The magnitude of this bias depends on the choice of stellar population synthesis model and the rest-frame wavelength range used in the fits. The best result, i.e., without significant bias, is obtained when rest-frame optical SEDs are fitted with models from Bruzual & Charlot. When the SEDs are extended to the rest-frame near-IR, a bias is introduced: photometricmasses of the z similar to 1 galaxies increase by a factor of 2 relative to the photometric masses of the z similar to 0 galaxies. When we use the Maraston models, the photometric masses of the z similar to 1 galaxies are low relative to the photometricmasses of the z similar to 0 galaxies by a factor of similar to 1.8. This offset occurs both for fits based on rest-frame optical SEDs and fits based on rest-frame optical+near-IR SEDs. The results indicate that model uncertainties produce uncertainties as high as a factor of 2.5 in mass estimates from rest-frame near-IR photometry, independent of uncertainties due to unknown star formation histories.
Keywords
OPTICAL LUMINOSITY DENSITY, TO-LIGHT RATIOS, FUNDAMENTAL PLANE, ELLIPTIC, GALAXIES, STELLAR MASSES, RED GALAXIES, POPULATION SYNTHESIS, EVOLUTION, SPECTROSCOPY, ULTRAVIOLET, cosmology : observations, galaxies : evolution, galaxies : formation

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MLA
van der Wel, Arjen, M Franx, S Wuyts, et al. “Comparing Dynamical and Photometric Mass Estimates of Low- and High-redshift Galaxies : Random and Systematic Uncertainties.” ASTROPHYSICAL JOURNAL 652.1 (2006): 97–106. Print.
APA
van der Wel, A., Franx, M., Wuyts, S., Van Dokkum, P., Huang, J., Rix, H.-W., & Illingworth, G. (2006). Comparing dynamical and photometric mass estimates of low- and high-redshift galaxies : random and systematic uncertainties. ASTROPHYSICAL JOURNAL, 652(1), 97–106.
Chicago author-date
van der Wel, Arjen, M Franx, S Wuyts, PG Van Dokkum, J Huang, H-W Rix, and GD Illingworth. 2006. “Comparing Dynamical and Photometric Mass Estimates of Low- and High-redshift Galaxies : Random and Systematic Uncertainties.” Astrophysical Journal 652 (1): 97–106.
Chicago author-date (all authors)
van der Wel, Arjen, M Franx, S Wuyts, PG Van Dokkum, J Huang, H-W Rix, and GD Illingworth. 2006. “Comparing Dynamical and Photometric Mass Estimates of Low- and High-redshift Galaxies : Random and Systematic Uncertainties.” Astrophysical Journal 652 (1): 97–106.
Vancouver
1.
van der Wel A, Franx M, Wuyts S, Van Dokkum P, Huang J, Rix H-W, et al. Comparing dynamical and photometric mass estimates of low- and high-redshift galaxies : random and systematic uncertainties. ASTROPHYSICAL JOURNAL. 2006;652(1):97–106.
IEEE
[1]
A. van der Wel et al., “Comparing dynamical and photometric mass estimates of low- and high-redshift galaxies : random and systematic uncertainties,” ASTROPHYSICAL JOURNAL, vol. 652, no. 1, pp. 97–106, 2006.
@article{8579097,
  abstract     = {We determine the importance of redshift-dependent systematic effects in the determination of stellar masses from broadband spectral energy distributions (SEDs), using high-quality kinematic and photometric data of early-type galaxies at z similar to 1 and z similar to 0. We find that photometric masses of z similar to 1 galaxies can be systematically different, by up to a factor of 2, from photometric masses of z similar to 0 galaxies with the same dynamical mass. The magnitude of this bias depends on the choice of stellar population synthesis model and the rest-frame wavelength range used in the fits. The best result, i.e., without significant bias, is obtained when rest-frame optical SEDs are fitted with models from Bruzual & Charlot. When the SEDs are extended to the rest-frame near-IR, a bias is introduced: photometricmasses of the z similar to 1 galaxies increase by a factor of 2 relative to the photometric masses of the z similar to 0 galaxies. When we use the Maraston models, the photometric masses of the z similar to 1 galaxies are low relative to the photometricmasses of the z similar to 0 galaxies by a factor of similar to 1.8. This offset occurs both for fits based on rest-frame optical SEDs and fits based on rest-frame optical+near-IR SEDs. The results indicate that model uncertainties produce uncertainties as high as a factor of 2.5 in mass estimates from rest-frame near-IR photometry, independent of uncertainties due to unknown star formation histories.},
  author       = {van der Wel, Arjen and Franx, M and Wuyts, S and Van Dokkum, PG and Huang, J and Rix, H-W and Illingworth, GD},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {OPTICAL LUMINOSITY DENSITY,TO-LIGHT RATIOS,FUNDAMENTAL PLANE,ELLIPTIC,GALAXIES,STELLAR MASSES,RED GALAXIES,POPULATION SYNTHESIS,EVOLUTION,SPECTROSCOPY,ULTRAVIOLET,cosmology : observations,galaxies : evolution,galaxies : formation},
  language     = {eng},
  number       = {1},
  pages        = {97--106},
  title        = {Comparing dynamical and photometric mass estimates of low- and high-redshift galaxies : random and systematic uncertainties},
  url          = {http://dx.doi.org/10.1086/508128},
  volume       = {652},
  year         = {2006},
}

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