Overestimated inclinations of Milgromian disc galaxies : the case of the ultradiffuse galaxy AGC 114905
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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.
Banik , I , Nagesh , S T , Haghi , H , Kroupa , P & Zhao , H 2022 , ' Overestimated inclinations of Milgromian disc galaxies : the case of the ultradiffuse galaxy AGC 114905 ' , Monthly Notices of the Royal Astronomical Society , vol. 513 , no. 3 , stac1073 , pp. 3541–3548 . https://doi.org/10.1093/mnras/stac1073
Monthly Notices of the Royal Astronomical Society
Copyright © 2022 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
DescriptionFunding: IB is supported by Science and Technology Facilities Council grant ST/V000861/1, which also partially supports HZ.
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