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

doi:10.1093/mnras/stac1073

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

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	stac1073
Pages (from-to)	3541–3548
Number of pages	8
Journal	Monthly Notices of the Royal Astronomical Society
Volume	513
Issue number	3
Early online date	19 Apr 2022
DOIs	https://doi.org/10.1093/mnras/stac1073
Publication status	Published - 1 Jul 2022

Keywords

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

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10.1093/mnras/stac1073Licence: CC BY

Banik_2022_MNRAS_Overestimated-inclinations-Milgromian-disc-galaxies_CC
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.
Final published version, 1.33 MBLicence: CC BY

Cite this

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title = "Overestimated inclinations of Milgromian disc galaxies: the case of the ultradiffuse galaxy AGC 114905",

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.",

keywords = "Galaxies: kinematics and dynamics, Gravitation, Galaxies: disc, Galaxies: dwarf, Galaxies: fundamental parameters, Galaxies: individual: AGC 114905",

author = "Indranil Banik and Nagesh, {Srikanth T} and Hosein Haghi and Pavel Kroupa and Hongsheng Zhao",

note = "Funding: IB is supported by Science and Technology Facilities Council grant ST/V000861/1, which also partially supports HZ.",

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T1 - Overestimated inclinations of Milgromian disc galaxies

T2 - the case of the ultradiffuse galaxy AGC 114905

AU - Banik, Indranil

AU - Nagesh, Srikanth T

AU - Haghi, Hosein

AU - Kroupa, Pavel

AU - Zhao, Hongsheng

N1 - Funding: IB is supported by Science and Technology Facilities Council grant ST/V000861/1, which also partially supports HZ.

PY - 2022/7/1

Y1 - 2022/7/1

N2 - 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.

AB - 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.

KW - Galaxies: kinematics and dynamics

KW - Gravitation

KW - Galaxies: disc

KW - Galaxies: dwarf

KW - Galaxies: fundamental parameters

KW - Galaxies: individual: AGC 114905

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DO - 10.1093/mnras/stac1073

M3 - Article

SN - 0035-8711

VL - 513

SP - 3541

EP - 3548

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

M1 - stac1073

ER -

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

Abstract

Keywords

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