TY - JOUR
T1 - Formation of a Malin 1 analogue in IllustrisTNG by stimulated accretion
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
AU - Springel, Volker
AU - Hernquist, Lars
N1 - Publisher Copyright:
© 2018 The Author(s).
PY - 2018/10/11
Y1 - 2018/10/11
N2 - 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.
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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U2 - 10.1093/mnrasl/sly111
DO - 10.1093/mnrasl/sly111
M3 - Article
AN - SCOPUS:85054279906
SN - 1745-3925
VL - 480
SP - L18-L22
JO - Monthly Notices of the Royal Astronomical Society: Letters
JF - Monthly Notices of the Royal Astronomical Society: Letters
IS - 1
ER -