EDGE: Predictable Scatter in the Stellar Mass–Halo Mass Relation of Dwarf Galaxies

Kim, Stacy Y.; Read, Justin I.; Rey, Martin P.; Orkney, Matthew D A; Nigudkar, Sushanta; Pontzen, Andrew; Taylor, Ethan; Agertz, Oscar; Das, Payel

doi:10.1093/mnras/stag825

preprintMonthly Notices of the Royal Astronomical SocietyApr 30, 2026GOLD OA

EDGE: Predictable Scatter in the Stellar Mass–Halo Mass Relation of Dwarf Galaxies

SYStacy Y. Kim JIJustin I. Read MPMartin P. Rey MDMatthew D A Orkney SNSushanta Nigudkar

University of Surrey · Carnegie Observatories · +9 more institutions

Indexed inarxivcrossrefdatacitedoaj

Abstract

Abstract The stellar-mass–halo-mass (SMHM) relation is central to our understanding of galaxy formation and the nature of dark matter. However, its normalisation, slope, and scatter are highly uncertain at dwarf galaxy scales. In this paper, we present DarkLight, a new semi-empirical dwarf galaxy formation model designed to robustly predict the SMHM relation for the smallest galaxies. DarkLight harnesses a correlation between the mean star formation rate of dwarfs and their peak rotation speed—the 〈SFR〉-vmax relation—that we derive from simulations and observations. Given the sparsity of data for isolated dwarfs with vmax ≲ 20 km/s, we fit the 〈SFR〉-vmax relation to observational data for dwarfs above this…

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Topics & keywords

Topics

Keywords

Halo
Astrophysics
Physics
Dwarf galaxy
Astronomy
Relation (database)
Dwarf galaxy problem
Galaxy

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