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

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Date
01/07/2022
Author
Banik, Indranil
Nagesh, Srikanth T
Haghi, Hosein
Kroupa, Pavel
Zhao, Hongsheng
Keywords
Galaxies: kinematics and dynamics
Gravitation
Galaxies: disc
Galaxies: dwarf
Galaxies: fundamental parameters
Galaxies: individual: AGC 114905
QB Astronomy
QC Physics
Astronomy and Astrophysics
Space and Planetary Science
3rd-DAS
MCC
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Abstract
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.
Citation
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
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stac1073
ISSN
0035-8711
Type
Journal article
Rights
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.
Description
Funding: IB is supported by Science and Technology Facilities Council grant ST/V000861/1, which also partially supports HZ.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/25414

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