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2021AJ....162..202M - Astron. J., 162, 202-202 (2021/November-0)

The baryonic Tully-Fisher relation in the Local Group and the equivalent circular velocity of pressure-supported dwarfs.

McGAUGH S.S., LELLI F., SCHOMBERT J.M., LI P., VISGAITIS T., PARKER K.S. and PAWLOWSKI M.S.

Abstract (from CDS):

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 βc that relates their observed velocity dispersion to the equivalent circular velocity of rotationally-supported galaxies of the same mass such that Vo = βcσ*. For a typical mass-to-light ratio U* = 2 M☉/L☉ in the V band, we find that βc = 2. More generally, logβc=0.25logΥ*+0.226. This provides a common kinematic scale relating pressure and rotationally-supported dwarf galaxies.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxies - Local Group - Orbital motion - Scaling relations

Simbad objects: 42

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