The distinguishing factor for gravity models: stellar population synthesis

Abstract

Alternative gravitations of Milgrom (MOND), Moffat (MOG), and CDM scenarios all simulate rotation curves of spirals with reasonable details. They display significant disparities however in predicting the stellar mass-to-light ($M_{\ast }/L$) ratios of the galaxies. We maintain this feature could serve as a distinguishing factor between different alternative theories. We analyze the rotation curves of 46 low- and high-surface brightness galaxies and compare the resulting $M_{\ast }/L$s with the predictions of the Stellar Population Synthesis (SPS) scheme. The color-$M_{\ast }/L$ correlation obtained for MOND is consistent with predictions of SPS models. MOG does not show this consistency, and the $M_{\ast }/L$s of CDM model shows large dispersions. Furthermore, $M_{\ast }/L$ ratios of MOND with Bekenstein interpolating function favor Kroupa's initial mass function (IMF) of the SPS scheme, while those of MOND with standard and simple interpolating functions are consistent with Salpeter's IMF. Here is another indication to differentiate between different IMFs that are used in SPS context.

11 pages, 4 figures, 3 tables, accepted in A&A

References in corpus (10)

• The Universal Rotation Curve of Spiral Galaxies. II The Dark Matter Distribution out to the Virial Radius
• Dark energy and dark matter as curvature effects
• A First Attempt to Calibrate the Baryonic Tully-Fisher Relation with Gas Dominated Galaxies
• Confrontation of MOND with the rotation curves of early-type disc galaxies
• Testing modified gravity with globular cluster velocity dispersions
• An $f(R)$ gravitation for galactic environments
• The rotation curves of flattened Sersic bulges
• MOND and the Universal Rotation Curve: similar phenomenologies
• MOND and the dark baryons
• Milgrom Relation Models for Spiral Galaxies from Two-Dimensional Velocity Maps

Cited by in corpus (5)

• A Novel Test of the Modified Newtonian Dynamics with Gas Rich Galaxies
• Declining rotation curves of galaxies as a test of gravitational theory
• Distant star clusters of the Milky Way in MOND
• Rotation curves of galaxies and the stellar mass-to-light ratio
• Comparison of Modeling SPARC spiral galaxies' rotation curves: halo models vs MOND