The tight empirical relation between dark matter halo mass and flat rotation velocity for late-type galaxies

We present a new empirical relation between galaxy dark matter halo mass (Mhalo) and the velocity along the flat portion of the rotation curve (Vflat), derived from 120 late-type galaxies from the SPARC data base. The orthogonal scatter in this relation is comparable to the observed scatter in the b...

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Prif Awduron: Katz, H, Desmond, H, McGaugh, S, Lelli, F
Fformat: Journal article
Cyhoeddwyd: Oxford University Press 2018
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author Katz, H
Desmond, H
McGaugh, S
Lelli, F
author_facet Katz, H
Desmond, H
McGaugh, S
Lelli, F
author_sort Katz, H
collection OXFORD
description We present a new empirical relation between galaxy dark matter halo mass (Mhalo) and the velocity along the flat portion of the rotation curve (Vflat), derived from 120 late-type galaxies from the SPARC data base. The orthogonal scatter in this relation is comparable to the observed scatter in the baryonic Tully–Fisher relation (BTFR), indicating a tight coupling between total halo mass and galaxy kinematics at r ≪ Rvir. The small vertical scatter in the relation makes it an extremely competitive estimator of total halo mass. We demonstrate that this conclusion holds true for different priors on M*/L[3.6μ] that give a tight BTFR, but requires that the halo density profile follow DC14 rather than NFW. We provide additional relations between Mhalo and other velocity definitions at smaller galactic radii (i.e. V2.2, Veff, and Vmax) which can be useful for estimating halo masses from kinematic surveys, providing an alternative to abundance matching. Furthermore, we constrain the dark matter analogue of the radial acceleration relation and also find its scatter to be small, demonstrating the fine balance between baryons and dark matter in their contribution to galaxy kinematics.
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spelling oxford-uuid:7d4477a8-3ecd-4e53-a0f1-4c4fcaa68f172022-03-26T21:02:34ZThe tight empirical relation between dark matter halo mass and flat rotation velocity for late-type galaxiesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:7d4477a8-3ecd-4e53-a0f1-4c4fcaa68f17Symplectic Elements at OxfordOxford University Press2018Katz, HDesmond, HMcGaugh, SLelli, FWe present a new empirical relation between galaxy dark matter halo mass (Mhalo) and the velocity along the flat portion of the rotation curve (Vflat), derived from 120 late-type galaxies from the SPARC data base. The orthogonal scatter in this relation is comparable to the observed scatter in the baryonic Tully–Fisher relation (BTFR), indicating a tight coupling between total halo mass and galaxy kinematics at r ≪ Rvir. The small vertical scatter in the relation makes it an extremely competitive estimator of total halo mass. We demonstrate that this conclusion holds true for different priors on M*/L[3.6μ] that give a tight BTFR, but requires that the halo density profile follow DC14 rather than NFW. We provide additional relations between Mhalo and other velocity definitions at smaller galactic radii (i.e. V2.2, Veff, and Vmax) which can be useful for estimating halo masses from kinematic surveys, providing an alternative to abundance matching. Furthermore, we constrain the dark matter analogue of the radial acceleration relation and also find its scatter to be small, demonstrating the fine balance between baryons and dark matter in their contribution to galaxy kinematics.
spellingShingle Katz, H
Desmond, H
McGaugh, S
Lelli, F
The tight empirical relation between dark matter halo mass and flat rotation velocity for late-type galaxies
title The tight empirical relation between dark matter halo mass and flat rotation velocity for late-type galaxies
title_full The tight empirical relation between dark matter halo mass and flat rotation velocity for late-type galaxies
title_fullStr The tight empirical relation between dark matter halo mass and flat rotation velocity for late-type galaxies
title_full_unstemmed The tight empirical relation between dark matter halo mass and flat rotation velocity for late-type galaxies
title_short The tight empirical relation between dark matter halo mass and flat rotation velocity for late-type galaxies
title_sort tight empirical relation between dark matter halo mass and flat rotation velocity for late type galaxies
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