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The Korean Astronomical Society (한국천문학회)
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THE EVOLUTION OF BARYONIC MASS OF ELLIPTICAL GALAXIES IN THE SLOAN DIGITAL SKY SURVEY

  • PENG, TING-HUNG (Institute of Astronomy, National Central University) ;
  • KOY, CHUNG-MING (Institute of Astronomy, Department of Physics and Center for Complex Systems, National Central University) ;
  • TIAN, YONG (Institute of Astronomy, National Central University) ;
  • CHEN, CHEN-HUNG (Department of Mathematics, National Central University)
  • Received : 2014.11.30
  • Accepted : 2015.06.30
  • Published : 2015.09.30
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Abstract

Stellar mass is an important parameter of galaxies. We estimate the dynamical mass of an elliptical galaxy by its velocity dispersion and effective radius using the Hernquist model in the framework of MOdified Newtonian Dynamics (MOND). MOND is an alternative theory to the dark matter paradigm. In MOND the dynamical mass is the same as the baryonic mass or luminous mass, and in elliptical galaxies most of the baryons reside in stars. We select elliptical galaxies between redshift 0.05 and 0.5 from the main galaxy sample and the luminous red galaxy sample in the Sloan Digital Sky Survey. We find that the stellar mass-to-light ratio at different redshift epochs can be fitted by a gamma distribution, and its mean is smaller at smaller redshifts.

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References

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