There is no universal acceleration scale in galaxies

Chan, Man Ho and Desai, Shantanu and Del Popolo, Antonino (2022) There is no universal acceleration scale in galaxies. Publications of the Astronomical Society of Japan. ISSN 0004-6264

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Abstract

Recently, many studies have seemed to reveal the existence of some correlations between dark matter and baryonic matter. In particular, the unexpected tight radial acceleration relation (RAR) discovered in rotating galaxies has drawn a lot of attention. The RAR suggests the existence of a universal and fundamental acceleration scale in galaxies, which seems to challenge the ?CDM model and favor some modified gravity theories. A large debate about whether RAR is compatible with the ?CDM model has arisen. Here, by analyzing the high-quality velocity dispersion profiles of 13 E0-type elliptical galaxies in the SDSS-IV MaNGA sample and assuming a power-law function of radius r for the 3D velocity dispersion in each galaxy, we report the RAR for E0-type elliptical galaxies and we show that the resultant RAR has more than 5 sigma deviations from the RAR in late-type galaxies. This new RAR provides an independent probe to falsify the existence of any universal acceleration scale in galaxies. Our result significantly challenges those modified gravity theories that suggest the existence of any universal acceleration scale.

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IITH Creators:

IITH Creators	ORCiD
Desai, Shantanu	http://orcid.org/0000-0002-0466-3288

Item Type:

Article

Additional Information:

We thank the anonymous referee for useful constructive feedback and comments. This work was partially supported by the Seed Funding Grant (RG 68/2020-2021R) and the Dean's Research Fund (activity code: 04628) from the Education University of Hong Kong.

Uncontrolled Keywords:

MASS,ANISOTROPY,MANGA

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

09 Nov 2022 11:59

Last Modified:

09 Nov 2022 11:59