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  Formation of a Malin 1 analogue in IllustrisTNG by stimulated accretion

Zhu, Q., Xu, D., Gaspari, M., Rodriguez-Gomez, V., Nelson, D., Vogelsberger, M., et al. (2018). Formation of a Malin 1 analogue in IllustrisTNG by stimulated accretion. Monthly Notices of the Royal Astronomical Society, 480, L18-L22.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CA10-5 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CA11-4
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018MNRAS.480L..18Z (Any fulltext)
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 Creators:
Zhu, Qirong1, Author
Xu, Dandan1, Author
Gaspari, Massimo1, Author
Rodriguez-Gomez, Vicente1, Author
Nelson, Dylan1, Author
Vogelsberger, Mark1, Author
Torrey, Paul1, Author
Pillepich, Annalisa1, Author
Zjupa, Jolanta1, Author
Weinberger, Rainer1, Author
Marinacci, Federico1, Author
Pakmor, Rüdiger1, Author
Genel, Shy1, Author
Li, Yuexing1, Author
Springel, Volker1, Author
Hernquist, Lars1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: methods: numerical galaxies: evolution galaxies: formation galaxies: individual: Malin 1 Astrophysics - Astrophysics of Galaxies
 Abstract: The galaxy Malin 1 contains the largest stellar disc known but the formation mechanism of this structure has been elusive. In this paper, we report a Malin 1 analogue in the 100 Mpc IllustrisTNG simulation and describe its formation history. At redshift zero, this massive galaxy, having a maximum circular velocity Vmax of 430 km s-1, contains a 100 kpc gas/stellar disc with morphology similar to Malin 1. The simulated galaxy reproduces well many observed features of Malin 1's vast disc, including its stellar ages, metallicities, and gas rotation curve. We trace the extended disc back in time and find that a large fraction of the cold gas at redshift zero originated from the cooling of hot halo gas, triggered by the merger of a pair of intruding galaxies. Our finding provides a novel way to form large galaxy discs as extreme as Malin 1 within the current galaxy formation framework.

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 Dates: 2018
 Publication Status: Issued
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 480 Sequence Number: - Start / End Page: L18 - L22 Identifier: -