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On the early evolution of Local Group dwarf galaxy types: star formation and supernova feedback

Bermejo-Climent, José R, Battaglia, Giuseppina, Gallart, Carme, Di Cintio, Arianna, Brook, Chris B, Cicuéndez, Luis, Monelli, Matteo, Leaman, Ryan, Mayer, Lucio, Peñarrubia, Jorge and Read, Justin I (2018) On the early evolution of Local Group dwarf galaxy types: star formation and supernova feedback Monthly Notices of the Royal Astronomical Society, 479 (2). pp. 1514-1527.

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Abstract

According to star formation histories (SFHs), Local Group dwarf galaxies can be broadly classified in two types: those forming most of their stars before z = 2 (fast) and those with more extended SFHs (slow). The most precise SFHs are usually derived from deep but not very spatially extended photometric data; this might alter the ratio of old to young stars when age gradients are present. Here, we correct for this effect and derive the mass formed in stars by z = 2 for a sample of 16 Local Group dwarf galaxies. We explore early differences between fast and slow dwarfs, and evaluate the impact of internal feedback by supernovae (SNe) on the baryonic and dark matter (DM) component of the dwarfs. Fast dwarfs assembled more stellar mass at early times and have larger amounts of DM within the half-light radius than slow dwarfs. By imposing that slow dwarfs cannot have lost their gas by z = 2, we constrain the maximum coupling efficiency of SN feedback to the gas and to the DM to be ̃10 per cent. We find that internal feedback alone appears insufficient to quench the SFH of fast dwarfs by gas deprivation, in particular for the fainter systems. Nonetheless, SN feedback can core the DM halo density profiles relatively easily, producing cores of the sizes of the half-light radius in fast dwarfs by z = 2 with very low efficiencies. Amongst the `classical' Milky Way satellites, we predict that the smallest cores should be found in Draco and Ursa Minor, while Sculptor and Fornax should host the largest ones.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Bermejo-Climent, José R
Battaglia, Giuseppina
Gallart, Carme
Di Cintio, Arianna
Brook, Chris B
Cicuéndez, Luis
Monelli, Matteo
Leaman, Ryan
Mayer, Lucio
Peñarrubia, Jorge
Read, Justin Ij.read@surrey.ac.uk
Date : 26 June 2018
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1093/mnras/sty1651
Copyright Disclaimer : © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/about_us/legal/notices) This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record José R Bermejo-Climent, Giuseppina Battaglia, Carme Gallart, Arianna Di Cintio, Chris B Brook, Luis Cicuéndez, Matteo Monelli, Ryan Leaman, Lucio Mayer, Jorge Peñarrubia, Justin I Read; On the early evolution of Local Group dwarf galaxy types: star formation and supernova feedback, Monthly Notices of the Royal Astronomical Society, Volume 479, Issue 2, 11 September 2018, Pages 1514–1527, https://doi.org/10.1093/mnras/sty1651 is available online at: https://academic.oup.com/mnras/article/479/2/1514/5045260 .
Uncontrolled Keywords : Galaxies: dwarf; Galaxies: evolution; Galaxies: haloes; Galaxies: star formation
Depositing User : Clive Harris
Date Deposited : 20 Sep 2018 14:46
Last Modified : 11 Dec 2018 11:24
URI: http://epubs.surrey.ac.uk/id/eprint/849380

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