The local Tully-Fisher relation for dwarf galaxies

Abstract

We study different incarnations of the Tully-Fisher (TF) relation for the Local Volume (LV) galaxies taken from Updated Nearby Galaxy Catalog. The UNGC sample contains 656 galaxies with $W_{50}$ HI-line-width estimates, mostly belonging to low mass dwarfs. Of them, 296 objects have distances measured with accuracy better than 10%. For the sample of 331 LV galaxies having baryonic masses $\log M_{bar}>5.8\log M_{\odot }$ we obtain a relation $\log M_{bar}=2.49\log W_{50}+3.97$ with observed scatter of 0.38 dex. The largest factors affecting the scatter are observational errors in $K$-band magnitudes and $W_{50}$ line widths for the tiny dwarfs, as well as uncertainty of their inclinations. We find that accounting for the surface brightness of the LV galaxies, or their gas fraction, or specific star formation rate, or the isolation index do not reduce essentially the observed scatter on the baryonic TF-diagram. We also notice that a sample of 71 dSph satellites of the Milky Way and M31 with known stellar velocity dispersion ${\sigma }^{\ast }$ tends to follow nearly the same bTF relation, having slightly lower masses than that of late-type dwarfs.

arXiv comment36 pages, 14 figures, 5 tables. Accepted to The Astrophysical Journal

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