On the Dwarf Galaxy Rotation Curve Diversity Problem
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 V2kpc-VRlast (V2kpc being the galaxy rotation velocity at 2 kpc, and VRlast being...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-06-01
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| Series: | Galaxies |
| Subjects: | |
| Online Access: | http://www.mdpi.com/2075-4434/6/3/67 |
| _version_ | 1818129558843424768 |
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| author | Antonino Del Popolo Morgan Le Delliou Xiguo Lee |
| author_facet | Antonino Del Popolo Morgan Le Delliou Xiguo Lee |
| author_sort | Antonino Del Popolo |
| collection | DOAJ |
| description | 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 V2kpc-VRlast (V2kpc being the galaxy rotation velocity at 2 kpc, and VRlast being the outermost one), with that of galaxies that we simulated, taking account of baryonic effects. The scatter in the rotation curves in the V2kpc-VRlast 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. |
| first_indexed | 2024-12-11T07:51:04Z |
| format | Article |
| id | doaj.art-e4d7c7c9143b4f4c8ddb6886e2808f5c |
| institution | Directory Open Access Journal |
| issn | 2075-4434 |
| language | English |
| last_indexed | 2024-12-11T07:51:04Z |
| publishDate | 2018-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Galaxies |
| spelling | doaj.art-e4d7c7c9143b4f4c8ddb6886e2808f5c2022-12-22T01:15:20ZengMDPI AGGalaxies2075-44342018-06-01636710.3390/galaxies6030067galaxies6030067On the Dwarf Galaxy Rotation Curve Diversity ProblemAntonino Del Popolo0Morgan Le Delliou1Xiguo Lee2Dipartimento di Fisica e Astronomia, University Of Catania, Viale Andrea Doria 6, 95125 Catania, ItalyInstitute of Theoretical Physics, Physics Department, Lanzhou University, No. 222, South Tianshui Road, Lanzhou 730000, ChinaInstitute of Modern Physics, Chinese Academy of Sciences, Post Oce Box31, Lanzhou 730000, ChinaIn 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 V2kpc-VRlast (V2kpc being the galaxy rotation velocity at 2 kpc, and VRlast being the outermost one), with that of galaxies that we simulated, taking account of baryonic effects. The scatter in the rotation curves in the V2kpc-VRlast 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.http://www.mdpi.com/2075-4434/6/3/67cosmologydark mattersmall-scale problems of the ΛCDM model |
| spellingShingle | Antonino Del Popolo Morgan Le Delliou Xiguo Lee On the Dwarf Galaxy Rotation Curve Diversity Problem Galaxies cosmology dark matter small-scale problems of the ΛCDM model |
| title | On the Dwarf Galaxy Rotation Curve Diversity Problem |
| title_full | On the Dwarf Galaxy Rotation Curve Diversity Problem |
| title_fullStr | On the Dwarf Galaxy Rotation Curve Diversity Problem |
| title_full_unstemmed | On the Dwarf Galaxy Rotation Curve Diversity Problem |
| title_short | On the Dwarf Galaxy Rotation Curve Diversity Problem |
| title_sort | on the dwarf galaxy rotation curve diversity problem |
| topic | cosmology dark matter small-scale problems of the ΛCDM model |
| url | http://www.mdpi.com/2075-4434/6/3/67 |
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