Dark Matter in Fractional Gravity III: Dwarf Galaxies Kinematics

Author:

Benetti Francesco12ORCID,Lapi Andrea1234ORCID,Gandolfi Giovanni123ORCID,Butt Minahil Adil123,Boumechta Yacer1235,Haridasu Balakrishna S.123ORCID,Baccigalupi Carlo123ORCID

Affiliation:

1. Scuola Internazionale Superiore Studi Avanzati (SISSA), Physics Area, Via Bonomea 265, 34136 Trieste, Italy

2. Institute for Fundamental Physics of the Universe (IFPU), Via Beirut 2, 34014 Trieste, Italy

3. Istituto Nazionale Fisica Nucleare (INFN), Sezione di Trieste, Via Valerio 2, 34127 Trieste, Italy

4. Istituto di Radio-Astronomia (IRA-INAF), Via Gobetti 101, 40129 Bologna, Italy

5. ICTP-The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy

Abstract

Recently, we put forward a framework where the dark matter (DM) component within virialized halos is subject to a non-local interaction originated by fractional gravity (FG) effects. In previous works, we demonstrated that such a framework can substantially alleviate the small-scale issues of the standard ΛCDM paradigm, without altering the DM mass profile predicted by N-body simulations, and retaining its successes on large cosmological scales. In this paper, we investigate further, to probe FG via the high-quality data of individual dwarf galaxies, by exploiting the rotation velocity profiles inferred from stellar and gas kinematic measurements in eight dwarf irregulars, and the projected velocity dispersion profiles inferred from the observed dynamics of stellar tracers in seven dwarf spheroidals and in the ultra-diffuse galaxy DragonFly 44. We find that FG can reproduce extremely well the rotation and dispersion curves of the analyzed galaxies, performing in most instances significantly better than the standard Newtonian setup.

Funder

Data Science methods for MultiMessenger Astrophysics & Multi-Survey Cosmology

EU

PRIN MIUR 2017

Fondazione ICSC, Spoke 3 Astrophysics and Cosmos Observations

National Recovery and Resilience Plan

INAF Large Grant 2022 funding scheme

Publisher

MDPI AG

Subject

General Physics and Astronomy

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