Formation of a Malin 1 analogue in IllustrisTNG by stimulated accretion

  title={Formation of a Malin 1 analogue in IllustrisTNG by stimulated accretion},
  author={Qirong Zhu and Dandan Xu and Massimo Gaspari and Vicente Rodriguez-Gomez and Dylan Nelson and Mark Vogelsberger and Paul Torrey and Annalisa Pillepich and Jolanta Zjupa and Rainer Weinberger and Federico Marinacci and R{\"u}diger Pakmor and Shy Genel and Yue-xing Li and Volker Springel and Lars Hernquist},
  journal={Monthly Notices of the Royal Astronomical Society: Letters},
The galaxy Malin 1 contains the largest stellar disk 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 $V_{\rm max}$ of 430 ${\rm km\ s^{-1}}$, contains a 100 kpc gas/stellar disk with morphology similar to Malin 1. The simulated galaxy reproduces well many observed features of Malin 1… 

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