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  Ultra-diffuse galaxies in the Auriga simulations

Liao, S., Gao, L., Frenk, C. S., Grand, R. J. J., Guo, Q., Gómez, F. A., et al. (2019). Ultra-diffuse galaxies in the Auriga simulations. Monthly Notices of the Royal Astronomical Society, 490(4), 5182-5195. doi:10.1093/mnras/stz2969.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-C0E9-B Version Permalink: http://hdl.handle.net/21.11116/0000-0005-C0EA-A
Genre: Journal Article

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 Creators:
Liao, Shihong, Author
Gao, Liang, Author
Frenk, Carlos S., Author
Grand, Robert J. J.1, Author              
Guo, Qi, Author
Gómez, Facundo A., Author
Marinacci, Federico, Author
Pakmor, Rüdiger2, Author              
Shao, Shi, Author
Springel, Volker3, Author              
Affiliations:
1Galaxy Formation, Cosmology, MPI for Astrophysics, Max Planck Society, ou_159878              
2Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              
3Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

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 Abstract: We investigate the formation of ultra-diffuse galaxies (UDGs) using the Auriga high-resolution cosmological magnetohydrodynamical simulations of Milky Way–sized galaxies. We identify a sample of 92 UDGs in the simulations that match a wide range of observables such as sizes, central surface brightness, Sérsic indices, colours, spatial distribution, and abundance. Auriga UDGs have dynamical masses similar to normal dwarfs. In the field, the key to their origin is a strong correlation present in low-mass dark matter haloes between galaxy size and halo spin parameter. Field UDGs form in dark matter haloes with larger spins compared to normal dwarfs in the field, in agreement with previous semi-analytical models. Satellite UDGs, on the other hand, have two different origins: ∼55 per cent of them formed as field UDGs before they were accreted; the remaining ∼45 per cent were normal field dwarfs that subsequently turned into UDGs as a result of tidal interactions.

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 Dates: 2019-12-23
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/stz2969
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Title: Monthly Notices of the Royal Astronomical Society
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Source Genre: Journal
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Publ. Info: OXFORD : OXFORD UNIV PRESS
Pages: - Volume / Issue: 490 (4) Sequence Number: - Start / End Page: 5182 - 5195 Identifier: ISSN: 0035-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000021470