On the dwarf galaxies rotation curves diversity problem

In this paper, we show how baryonic physics can solve the problem of the striking diversity in dwarf galaxies rotation curves shapes. To this aim, we compare the distribution of galaxies of the SPARC sample, in the plane \(V_{\rm 2 kpc}\)-\(V_{\rm Rlast }\) (being \(V_{\rm 2kpc}\) the galaxy rotatio...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2024-10
Main Authors: Antonino Del Popolo, Morgan Le Delliou, Lee, Xiguo
Format: Article
Language:English
Subjects:
Baryons
Dwarf galaxies
Galactic halos
Galactic rotation
Galaxy distribution
Self-similarity
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this paper, we show how baryonic physics can solve the problem of the striking diversity in dwarf galaxies rotation curves shapes. To this aim, we compare the distribution of galaxies of the SPARC sample, in the plane \(V_{\rm 2 kpc}\)-\(V_{\rm Rlast }\) (being \(V_{\rm 2kpc}\) the galaxy rotation velocity at \(2\) kpc, and \(V_{\rm Rlast}\) that outermost one) with that of galaxies that we simulated taking account of baryonic effects. The scatter in the rotation curves in the \(V_{\rm 2 kpc}\)-\(V_{\rm Rlast }\) plane, and the trend of the SPARC sample's, and our simulated galaxies', distribution is in good agreement. The solution of the "diversity" problem lies in the ability of baryonic process to produce non self-similar haloes, contrary to DM-only simulations. We show also that baryonic effects can reproduce the rotation curves of galaxies like IC2574 characterized by a slow rising with radius. A solution to the diversity problem can be obtained taking appropriately into account the baryon physics effects.
ISSN:2331-8422
DOI:10.48550/arxiv.2410.05948