Monthly Notices of the Royal Astronomical Society
We investigate a correlation between the dark matter content of elliptical galaxies and their ellipticity ϵ that was initially reported in 2014. We use new determinations of dark matter and ellipticities that are posterior to that time. Our data set consists of 237 elliptical galaxies passing a strict set of criteria that selects a homogeneous sample of typical elliptical galaxies. We find a relation between the mass-to-light ratio and ellipticity ϵ that is well fitted by M/L = (14.1 ± 5.4)ϵ, which agrees with the result reported in 2014. Our analysis includes 135 galaxies that were not in the 2014 analysis, and includes data sets with refined versions of previous methods. The consistency between the present and 2014 analyses reduces the possibility that the initial observation of the correlation came from approximations in the methods used to estimate dark matter content or lower resolution data, thereby lending support to a physical origin.
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Original Publication Citation
Winters, D. M., Deur, A., & Zheng, X. (2023). Updated analysis of an unexpected correlation between dark matter and galactic ellipticity. Monthly Notices of the Royal Astronomical Society, 518(2), 2845-2852. https://doi.org/10.1093/mnras/stac3236
Winters, D. M.; Deur, Alexandre; and Zheng, X., "Updated Analysis of an Unexpected Correlation Between Dark Matter and Galactic Ellipticity" (2022). Physics Faculty Publications. 710.