The size distribution of galaxies in the Sloan Digital Sky Survey

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ID: 298501
2003
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Abstract
We use a complete sample of about 140,000 galaxies from the Sloan Digital Sky Survey (SDSS) to study the size distribution of galaxies and its dependence on their luminosity, stellar mass, and morphological type.The large SDSS database provides statistics of unprecedented accuracy.For each type of galaxy, the size distribution at given luminosity (or stellar mass) is well described by a log-normal function, characterized by its median R and dispersion σ ln R .For late-type galaxies, there is a characteristic luminosity at M r,0 ∼ -20.5 (assuming h = 0.7) corresponding to a stellar mass M 0 ∼ 10 10.6 M ⊙ .Galaxies more massive than M 0 have R ∝ M 0.4 and σ ln R ∼ 0.3, while less massive galaxies have R ∝ M 0.15 and σ ln R ∼ 0.5.For early-type galaxies, the R -M relation is significantly steeper, R ∝ M 0.55 , but the σ ln R -M relation is similar to that of bright late-type galaxies.Faint red galaxies have sizes quite independent of their luminosities.We use simple theoretical models to interpret these results.The observed R -M relation for late-type galaxies can be explained if the fraction of baryons that form stars is as predicted by the standard feedback model.Fitting the observed σ ln
Reference Key
openalex_W2110974947 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Shiyin Shen, H. J. Mo, S. D. M. White, Michael R. Blanton, G. Kauffmann, W. Voges, J. Brinkmann, István Csabai
Journal monthly notices of the royal astronomical society
Year 2003
DOI
10.1046/j.1365-8711.2003.06740.x
URL
https://doi.org/10.1046/j.1365-8711.2003.06740.x
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