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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29231
Title: Formation of a Malin 1 analogue in IllustrisTNG by stimulated accretion
Authors: 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
Springel, Volker
Hernquist, Lars
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 480
Issue: 1
First Page: L18
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 V_max of 430 km/s, 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.
URI: http://hdl.handle.net/20.500.12386/29231
URL: https://academic.oup.com/mnrasl/article/480/1/L18/5040239
ISSN: 0035-8711
DOI: 10.1093/mnrasl/sly111
Bibcode ADS: 2018MNRAS.480L..18Z
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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