Document Type

Article

Publication Date

10-19-2021

Abstract

We explore the baryonic Tully-Fisher relation in the Local Group. Rotationally-supported Local Group galaxies adhere precisely to the relation defined by more distant galaxies. For pressure-supported dwarf galaxies, we determine the scaling factor β c that relates their observed velocity dispersion to the equivalent circular velocity of rotationally-supported galaxies of the same mass such that V o = β c σ ∗. For a typical mass-to-light ratio ϒ∗ = 2 M /L in the V band, we find that β c = 2. More generally, β {c}=0.25∗ +0.226. This provides a common kinematic scale relating pressure and rotationally-supported dwarf galaxies.

Keywords

galaxies, local group, orbital motion, scaling relations

Publication Title

Astronomical Journal

Grant

1911909

Rights

© 2021. The American Astronomical Society. All rights reserved. This content is free to access, download, and share. For all other uses, you must obtain permission to reuse content: https://journals.aas.org/article-charges-and-copyright/#AAS_material

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