Interpreting the evolution of the size-luminosity relation for disk galaxies from redshift 1 to the present

Alyson Brooks, A. R. Solomon, F. Governato, J. McCleary, L. A. Macarthur, C. B.A. Brook, P. Jonsson, T. R. Quinn, J. Wadsley

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A sample of very high resolution cosmological disk galaxy simulations is used to investigate the evolution of galaxy disk sizes back to redshift 1 within the ACDM cosmology. Artificial images in the rest-frame B band are generated, allowing for a measurement of disk scale lengths using surface brightness profiles as observations would, and avoiding any assumption that light must follow mass as previous models have assumed. We demonstrate that these simulated disks are an excellent match to the observed magnitude-size relation for both local disks and for disks at z = 1 in the magnitude/mass range of overlap. We disentangle the evolution seen in the population as a whole from the evolution of individual disk galaxies. In agreement with observations, our simulated disks undergo roughly 1.5 mag arcsec-2 of surface brightness dimming since z = 1. We find evidence that evolution in the magnitude-size plane varies by mass, such that galaxies with M* ≤ 109M ȯ undergo more evolution in size than luminosity, while dwarf galaxies tend to evolve potentially more in luminosity. The disks grow in such a way as to stay on roughly the same stellar-mass-size relation with time. Finally, due to an evolving stellar-mass-star-formation-rate (SFR) relation, a galaxy at a given stellar mass (or size) at z = 1 will reside in a more massive halo and have a higher SFR, and thus a higher luminosity, than a counterpart of the same stellar mass at z = 0.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume728
Issue number1
DOIs
StatePublished - Feb 10 2011

Fingerprint

disk galaxies
luminosity
stellar mass
star formation rate
brightness
galaxies
dimming
dwarf galaxies
guy wires
cosmology
halos
high resolution
profiles
simulation

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Galaxies: evolution
  • Galaxies: fundamental parameters
  • Methods: numerical

Cite this

Brooks, Alyson ; Solomon, A. R. ; Governato, F. ; McCleary, J. ; Macarthur, L. A. ; Brook, C. B.A. ; Jonsson, P. ; Quinn, T. R. ; Wadsley, J. / Interpreting the evolution of the size-luminosity relation for disk galaxies from redshift 1 to the present. In: Astrophysical Journal. 2011 ; Vol. 728, No. 1.
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Brooks, A, Solomon, AR, Governato, F, McCleary, J, Macarthur, LA, Brook, CBA, Jonsson, P, Quinn, TR & Wadsley, J 2011, 'Interpreting the evolution of the size-luminosity relation for disk galaxies from redshift 1 to the present', Astrophysical Journal, vol. 728, no. 1. https://doi.org/10.1088/0004-637X/728/1/51

Interpreting the evolution of the size-luminosity relation for disk galaxies from redshift 1 to the present. / Brooks, Alyson; Solomon, A. R.; Governato, F.; McCleary, J.; Macarthur, L. A.; Brook, C. B.A.; Jonsson, P.; Quinn, T. R.; Wadsley, J.

In: Astrophysical Journal, Vol. 728, No. 1, 10.02.2011.

Research output: Contribution to journalArticle

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AB - A sample of very high resolution cosmological disk galaxy simulations is used to investigate the evolution of galaxy disk sizes back to redshift 1 within the ACDM cosmology. Artificial images in the rest-frame B band are generated, allowing for a measurement of disk scale lengths using surface brightness profiles as observations would, and avoiding any assumption that light must follow mass as previous models have assumed. We demonstrate that these simulated disks are an excellent match to the observed magnitude-size relation for both local disks and for disks at z = 1 in the magnitude/mass range of overlap. We disentangle the evolution seen in the population as a whole from the evolution of individual disk galaxies. In agreement with observations, our simulated disks undergo roughly 1.5 mag arcsec-2 of surface brightness dimming since z = 1. We find evidence that evolution in the magnitude-size plane varies by mass, such that galaxies with M* ≤ 109M ȯ undergo more evolution in size than luminosity, while dwarf galaxies tend to evolve potentially more in luminosity. The disks grow in such a way as to stay on roughly the same stellar-mass-size relation with time. Finally, due to an evolving stellar-mass-star-formation-rate (SFR) relation, a galaxy at a given stellar mass (or size) at z = 1 will reside in a more massive halo and have a higher SFR, and thus a higher luminosity, than a counterpart of the same stellar mass at z = 0.

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