Overestimated inclinations of Milgromian disc galaxies: the case of the ultradiffuse galaxy AGC 114905

Indranil Banik*, Srikanth T Nagesh*, Hosein Haghi, Pavel Kroupa, Hongsheng Zhao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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We present hydrodynamical star-forming simulations in the Milgromian dynamics (MOND) framework of a gas-rich disc galaxy with properties similar to AGC 114905, which has recently been argued to have a rotation curve (RC) that is inconsistent with the MOND prediction. Our first model considers the galaxy in isolation, while our second model includes an external field of 0.05a0⁠, the estimated gravitational field from large-scale structure. We show that isophotes in the face-on view can differ from circular at the 50% level. This could mislead observers into overestimating the inclination i between disc and sky planes. Because RCs require a correction factor of 1/sin i, the actual RC could be much higher than reported by observers. This plausibly reconciles AGC 114905 with MOND expectations.
Original languageEnglish
Article numberstac1073
Pages (from-to)3541–3548
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Early online date19 Apr 2022
Publication statusPublished - 1 Jul 2022


  • Galaxies: kinematics and dynamics
  • Gravitation
  • Galaxies: disc
  • Galaxies: dwarf
  • Galaxies: fundamental parameters
  • Galaxies: individual: AGC 114905


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