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- Title
On the Dwarf Galaxy Rotation Curve Diversity Problem.
- Authors
Del Popolo, Antonino; Le Delliou, Morgan; Lee, Xiguo
- Abstract
In this paper, we show how baryonic physics can solve the problem of the striking diversity in dwarf galaxy rotation curves shapes. To this aim, we compare the distribution of galaxies of the SPARC sample, in the plane V 2 kpc - V Rlast ( V 2 kpc being the galaxy rotation velocity at 2 kpc, and V Rlast being the outermost one), with that of galaxies that we simulated, taking account of baryonic effects. The scatter in the rotation curves in the V 2 kpc - V Rlast plane, as well as the trend of the SPARC sample, and our simulated galaxy distribution is in good agreement. The solution of the "diversity" problem lies in the ability of the 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 such as IC2574, which are characterized by a slow rise in radius. A solution to the diversity problem can be obtained taking the baryon physics effects appropriately into account.
- Subjects
DWARF galaxies; ANGULAR velocity measurement; METAPHYSICAL cosmology; DARK matter; STELLAR populations
- Publication
Galaxies (2075-4434), 2018, Vol 6, Issue 3, p67
- ISSN
2075-4434
- Publication type
Article
- DOI
10.3390/galaxies6030067