The Velocity Dispersion Function of Early‐Type Galaxies
- Sheth, Ravi
- Bernardi, Mariangela
- Schechter, Paul
- Burles, Scott
- Eisenstein, Daniel James
- Finkbeiner, Douglas
- Frieman, Joshua
- Lupton, Robert
- Schlegel, David
- Subbarao, Mark
- Shimasaku, K.
- Bahcall, Neta
- Brinkmann, J.
- Ivezić, Željko
Publication date
December 2017
DOI Publisher
University of Chicago Press Journal
The Astrophysical JournalAbstract
The distribution of early-type galaxy velocity dispersions, phgr(σ), is measured using a sample drawn from the Sloan Digital Sky Survey database. Its shape differs significantly from that obtained by simply using the mean correlation between luminosity L and velocity dispersion σ to transform the luminosity function into a velocity function: ignoring the scatter around the mean σ-L relation is a bad approximation. An estimate of the contribution from late-type galaxies is also made, which suggests that phgr(σ) is dominated by early-type galaxies at velocities larger than ~200 km s-1.Astronom
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