The Tully-Fisher relation for flat galaxies

TL;DR

This paper develops an improved multiparametric Tully-Fisher relation for flat, edge-on galaxies, incorporating various parameters to reduce scatter and enhance its utility in cosmological studies.

Contribution

It introduces a new multiparametric Tully-Fisher relation for flat galaxies that significantly reduces scatter by including specific structural and color parameters.

Findings

Standard deviation reduced to 0.32 mag

HI-to-optical luminosity ratio and colors are key parameters

Relation comparable to the best modern galaxy samples

Abstract

We construct a multiparametric Tully-Fisher (TF) relation for a large sample of edge-on galaxies from the Revised Flat Galaxy Catalog using HI data from the EDD database and parameters from the EGIS catalog. We incorporate a variety of additional parameters including structural parameters of edge-on galaxies in different bandpasses. Besides the rotation curve maximum, only the HI-to-optical luminosity ratio and optical colours play a statistically significant role in the multiparametric TF relation. We are able to decrease the standard deviation of the multiparametric TF relation down to 0.32 mag, which is at the level of best modern samples of galaxies used for studies of the matter motion in the Universe via the TF-relation.