The relationship between the neutral hydrogen and dark mass in the galaxies

TL;DR

This paper challenges the previously observed correlation between neutral hydrogen and dark matter in galaxies, proposing that the correlation is an artifact caused by gravitational stability conditions rather than a direct relationship.

Contribution

It demonstrates that the apparent correlation between HI distribution and dark matter is an artifact explained by gravitational stability criteria, not a direct physical link.

Findings

The correlation between HI and dark matter is an artifact.

Gas surface density relates to the critical density for gravitational stability.

The observed rotation curves can be explained without assuming a direct HI-dark matter correlation.

Abstract

Starting from Bosma' (1981) paper, it was demonstrated by different authors that the observed shape of rotation curves of many spiral galaxies can be explained if to assume that the radial density distribution of the dark matter is correlated with the distribution of $HI$: the column densities of the dark matter and $HI$ are proportional. We show that this correlation is obviously to be an artifact and can be explained by assuming that the gas surface density is approximately equal or in general proportional to the critical density for the local gravitational stability of gaseous layer.