Formation of a Malin 1 analogue in IllustrisTNG by stimulated accretion

Qirong Zhu, Dandan Xu, Massimo Gaspari, Vicente Rodriguez-Gomez, Dylan Nelson, Mark Vogelsberger, Paul Torrey, Annalisa Pillepich, Jolanta Zjupa, Rainer Weinberger, Federico Marinacci, Rüdiger Pakmor, Shy Genel, Yuexing Cindy Li, Volker Springel, Lars Hernquist

Research output: Contribution to journalArticle

3 Citations (Scopus)

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 toMalin 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.

Original languageEnglish (US)
Pages (from-to)L18-L22
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume480
Issue number1
DOIs
StatePublished - Jan 1 2018

Fingerprint

accretion
analogs
galaxies
gas
gases
cold gas
disk galaxies
galactic evolution
formation mechanism
merger
metallicity
halos
histories
cooling
curves
history
simulation

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Zhu, Q., Xu, D., Gaspari, M., Rodriguez-Gomez, V., Nelson, D., Vogelsberger, M., ... Hernquist, L. (2018). Formation of a Malin 1 analogue in IllustrisTNG by stimulated accretion. Monthly Notices of the Royal Astronomical Society: Letters, 480(1), L18-L22. https://doi.org/10.1093/mnrasl/sly111
Zhu, Qirong ; Xu, Dandan ; Gaspari, Massimo ; Rodriguez-Gomez, Vicente ; Nelson, Dylan ; Vogelsberger, Mark ; Torrey, Paul ; Pillepich, Annalisa ; Zjupa, Jolanta ; Weinberger, Rainer ; Marinacci, Federico ; Pakmor, Rüdiger ; Genel, Shy ; Li, Yuexing Cindy ; Springel, Volker ; Hernquist, Lars. / Formation of a Malin 1 analogue in IllustrisTNG by stimulated accretion. In: Monthly Notices of the Royal Astronomical Society: Letters. 2018 ; Vol. 480, No. 1. pp. L18-L22.
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Zhu, Q, Xu, D, Gaspari, M, Rodriguez-Gomez, V, Nelson, D, Vogelsberger, M, Torrey, P, Pillepich, A, Zjupa, J, Weinberger, R, Marinacci, F, Pakmor, R, Genel, S, Li, YC, Springel, V & Hernquist, L 2018, 'Formation of a Malin 1 analogue in IllustrisTNG by stimulated accretion', Monthly Notices of the Royal Astronomical Society: Letters, vol. 480, no. 1, pp. L18-L22. https://doi.org/10.1093/mnrasl/sly111

Formation of a Malin 1 analogue in IllustrisTNG by stimulated accretion. / Zhu, Qirong; Xu, Dandan; Gaspari, Massimo; Rodriguez-Gomez, Vicente; Nelson, Dylan; Vogelsberger, Mark; Torrey, Paul; Pillepich, Annalisa; Zjupa, Jolanta; Weinberger, Rainer; Marinacci, Federico; Pakmor, Rüdiger; Genel, Shy; Li, Yuexing Cindy; Springel, Volker; Hernquist, Lars.

In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 480, No. 1, 01.01.2018, p. L18-L22.

Research output: Contribution to journalArticle

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AU - Zhu, Qirong

AU - Xu, Dandan

AU - Gaspari, Massimo

AU - Rodriguez-Gomez, Vicente

AU - Nelson, Dylan

AU - Vogelsberger, Mark

AU - Torrey, Paul

AU - Pillepich, Annalisa

AU - Zjupa, Jolanta

AU - Weinberger, Rainer

AU - Marinacci, Federico

AU - Pakmor, Rüdiger

AU - Genel, Shy

AU - Li, Yuexing Cindy

AU - Springel, Volker

AU - Hernquist, Lars

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AB - 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 toMalin 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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