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Satellite galaxy velocity dispersions in the SDSS and modified gravity models

Satellite galaxy velocity dispersions in the SDSS and modified gravity models

Authors :
Moffat, J. W.
Toth, V. T.
Source :
Galaxies 2014, 2(2), 263-274
Publication Year :
2009

Abstract

The Sloan Digital Sky Survey (SDSS) provides data on several hundred thousand galaxies. Precise location of these galaxies in the sky, along with information about their luminosities and line-of-sight (Doppler) velocities allows one to construct a three-dimensional map of their location and estimate their line-of-sight velocity dispersion. This information, in principle, allows one to test dynamical gravity models, specifically models of satellite galaxy velocity dispersions near massive hosts. A key difficulty is the separation of true satellites from interlopers. We sidestep this problem by not attempting to derive satellite galaxy velocity dispersions from the data, but instead incorporate an interloper background into the mathematical models and compare the result to the actual data. We find that due to the presence of interlopers, it is not possible to exclude several gravitational theories on the basis of the SDSS data.<br />Comment: 4 pages, 2 figures. Last section updated with an improved approach to compare models. Main conclusion unchanged

Details

Database :
arXiv
Journal :
Galaxies 2014, 2(2), 263-274
Publication Type :
Report
Accession number :
edsarx.0901.1927
Document Type :
Working Paper
Full Text :
https://doi.org/10.3390/galaxies2020263