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Abundance matching with the mean star formation rate: there is no missing satellites problem in the Milky Way above M200∼109M

Read, J. I. and Erkal, D. (2019) Abundance matching with the mean star formation rate: there is no missing satellites problem in the Milky Way above M200∼109M Monthly Notices of the Royal Astronomical Society.

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Abstract

We introduce a novel abundance matching technique that produces a more accurate estimate of the pre-infall halo mass, M200, for satellite galaxies. To achieve this, we abundance match with the mean star formation rate, averaged over the time when a galaxy was forming stars, ⟨SFR⟩, instead of the stellar mass, M∗. Using data from the Sloan Digital Sky Survey, the GAMA survey and the Bolshoi simulation, we obtain a statistical ⟨SFR⟩−M200 relation in ΛCDM. We then compare the pre-infall halo mass, Mabund200, derived from this relation with the pre-infall dynamical mass, Mdyn200, for 21 nearby dSph and dIrr galaxies, finding a good agreement between the two. As a first application, we use our new ⟨SFR⟩−M200 relation to empirically measure the cumulative mass function of a volume-complete sample of bright Milky Way satellites within 280 kpc of the Galactic centre. Comparing this with a suite of cosmological 'zoom' simulations of Milky Way-mass halos that account for subhalo depletion by the Milky Way disc, we find no missing satellites problem above M200∼09M in the Milky Way. We discuss how this empirical method can be applied to a larger sample of nearby spiral galaxies.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Read, J. I.j.read@surrey.ac.uk
Erkal, D.d.erkal@surrey.ac.uk
Date : 2019
Copyright Disclaimer : © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
Uncontrolled Keywords : Cosmology: dark matter. Cosmology: observations. Galaxies: abundances. Galaxies: dwarf. Galaxies: haloes. Galaxies: kinematics and dynamics.
Related URLs :
Depositing User : Clive Harris
Date Deposited : 21 May 2019 09:31
Last Modified : 21 May 2019 09:31
URI: http://epubs.surrey.ac.uk/id/eprint/851873

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