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EDGE : Two routes t...
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Orkney, Matthew D.A.University of Surrey
(author)
EDGE : Two routes to dark matter core formation in ultra-faint dwarfs
- Article/chapterEnglish2021
Publisher, publication year, extent ...
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2021-04-21
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Oxford University Press (OUP),2021
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14 s.
Numbers
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LIBRIS-ID:oai:lup.lub.lu.se:dedbb7d8-607c-47e4-8880-9227798f89cf
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https://lup.lub.lu.se/record/dedbb7d8-607c-47e4-8880-9227798f89cfURI
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https://doi.org/10.1093/mnras/stab1066DOI
Supplementary language notes
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Language:English
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Summary in:English
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Classification
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
Notes
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In the standard Lambda cold dark matter paradigm, pure dark matter simulations predict dwarf galaxies should inhabit dark matter haloes with a centrally diverging density 'cusp'. This is in conflict with observations that typically favour a constant density 'core'. We investigate this 'cusp-core problem' in 'ultra-faint' dwarf galaxies simulated as part of the 'Engineering Dwarfs at Galaxy formation's Edge' project. We find, similarly to previous work, that gravitational potential fluctuations within the central region of the simulated dwarfs kinematically heat the dark matter particles, lowering the dwarfs' central dark matter density. However, these fluctuations are not exclusively caused by gas inflow/outflow, but also by impulsive heating from minor mergers. We use the genetic modification approach on one of our dwarf's initial conditions to show how a delayed assembly history leads to more late minor mergers and, correspondingly, more dark matter heating. This provides a mechanism by which even ultra-faint dwarfs ($M_∗ \lt 10^5\, \text{M}_{\odot }$), in which star formation was fully quenched at high redshift, can have their central dark matter density lowered over time. In contrast, we find that late major mergers can regenerate a central dark matter cusp, if the merging galaxy had sufficiently little star formation. The combination of these effects leads us to predict significant stochasticity in the central dark matter density slopes of the smallest dwarfs, driven by their unique star formation and mass assembly histories.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Read, Justin I.University of Surrey
(author)
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Rey, Martin P.Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science(Swepub:lu)ma0444re
(author)
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Nasim, ImranUniversity of Surrey
(author)
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Pontzen, AndrewUniversity College London
(author)
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Agertz, OscarLund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science(Swepub:lu)os6277ag
(author)
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Kim, Stacy Y.University of Surrey
(author)
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Delorme, MaximeUniversity of Paris-Saclay
(author)
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Dehnen, WalterUniversity of Leicester,Ludwig-Maximilian University of Munich,Heidelberg University
(author)
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University of SurreyAstronomi - Genomgår omorganisation
(creator_code:org_t)
Related titles
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In:Monthly Notices of the Royal Astronomical Society: Oxford University Press (OUP)504:3, s. 3509-35220035-87111365-2966
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