C-19 and Hot, Wide, Star Streams
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866909608225800192 |
|---|---|
| author | Carlberg, Raymond G. Ibata, Rodrigo Martin, Nicolas F. Starkenburg, Else Aguado, David S. Malhan, Khyati Venn, Kim Venn, Kim |
| author_facet | Carlberg, Raymond G. Ibata, Rodrigo Martin, Nicolas F. Starkenburg, Else Aguado, David S. Malhan, Khyati Venn, Kim Venn, Kim |
| contents | The C-19 star stream has the abundance characteristics of an unusually metal poor globular cluster but kinematically is uncharacteristically hot and wide for a cluster stream, having a line of sight velocity dispersion of 7 +/- 2 km/s and a 1-sigma width of 240 pc. We show that the tidal dissolution of an old, lower mass, globular cluster in a CDM galactic halo can create a hot, wide stream currently near orbital apocenter. A cosmological Milky Way n-body simulation motivates the parameters for an evolving Milky Way halo potential containing an orbiting subhalo population in which we model a star cluster progenitor of C-19. The same model parameters have been used for a GD-1 stream model. The ~7 km/s velocity dispersion is readily accomplished with an evolving CDM subhalo population, a progenitor cluster mass ~2x10^4 M_sun and an orbit that keeps the progenitor orbital pericenter within about 10 kpc of the Milky Way dark halo or its precursors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_22966 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | C-19 and Hot, Wide, Star Streams Carlberg, Raymond G. Ibata, Rodrigo Martin, Nicolas F. Starkenburg, Else Aguado, David S. Malhan, Khyati Venn, Kim Venn, Kim Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics The C-19 star stream has the abundance characteristics of an unusually metal poor globular cluster but kinematically is uncharacteristically hot and wide for a cluster stream, having a line of sight velocity dispersion of 7 +/- 2 km/s and a 1-sigma width of 240 pc. We show that the tidal dissolution of an old, lower mass, globular cluster in a CDM galactic halo can create a hot, wide stream currently near orbital apocenter. A cosmological Milky Way n-body simulation motivates the parameters for an evolving Milky Way halo potential containing an orbiting subhalo population in which we model a star cluster progenitor of C-19. The same model parameters have been used for a GD-1 stream model. The ~7 km/s velocity dispersion is readily accomplished with an evolving CDM subhalo population, a progenitor cluster mass ~2x10^4 M_sun and an orbit that keeps the progenitor orbital pericenter within about 10 kpc of the Milky Way dark halo or its precursors. |
| title | C-19 and Hot, Wide, Star Streams |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2410.22966 |