C-19 and Hot, Wide Star Streams
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 ^−1 and a 1 σ width of 240 pc. We show that the tidal dissolution...
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| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ade4ce |
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| author | Raymond G. Carlberg Rodrigo Ibata Nicolas F. Martin Else Starkenburg David S. Aguado Khyati Malhan Kim Venn Zhen Yuan |
| author_facet | Raymond G. Carlberg Rodrigo Ibata Nicolas F. Martin Else Starkenburg David S. Aguado Khyati Malhan Kim Venn Zhen Yuan |
| author_sort | Raymond G. Carlberg |
| collection | DOAJ |
| description | 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 ^−1 and a 1 σ width of 240 pc. We show that the tidal dissolution of an old, lower-mass globular cluster in a cold dark matter (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 ^−1 velocity dispersion is readily accomplished with an evolving CDM subhalo population, a progenitor cluster mass ≃2 × 10 ^4 M _⊙ , and an orbit that keeps the progenitor orbital pericenter within about 10 kpc of the Milky Way dark halo or its precursors. |
| format | Article |
| id | doaj-art-c8a24d76036744adaa4f89f78fa6eadf |
| institution | DOAJ |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-c8a24d76036744adaa4f89f78fa6eadf2025-08-20T02:40:27ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198819610.3847/1538-4357/ade4ceC-19 and Hot, Wide Star StreamsRaymond G. Carlberg0https://orcid.org/0000-0002-7667-0081Rodrigo Ibata1https://orcid.org/0000-0002-3292-9709Nicolas F. Martin2https://orcid.org/0000-0002-1349-202XElse Starkenburg3https://orcid.org/0000-0003-4501-103XDavid S. Aguado4https://orcid.org/0000-0001-5200-3973Khyati Malhan5https://orcid.org/0000-0002-8318-433XKim Venn6https://orcid.org/0000-0003-4134-2042Zhen Yuan7https://orcid.org/0000-0002-8129-5415Department of Astronomy & Astrophysics, University of Toronto , Toronto, ON M5S 3H4, Canada ; raymond.carlberg@utoronto.caUniversité de Strasbourg , CNRS, Observatoire astronomique de Strasbourg, UMR 7550, F-67000 Strasbourg, FranceUniversité de Strasbourg , CNRS, Observatoire astronomique de Strasbourg, UMR 7550, F-67000 Strasbourg, FranceKapteyn Astronomical Institute, University of Groningen , Landleven 12, 9747 AD Groningen, The NetherlandsInstituto de Astrofísica de Canarias , Vía Láctea, 38205 La Laguna, Tenerife, SpainDARK, Niels Bohr Institute, University of Copenhagen , Jagtvej 128, 2200 Copenhagen, DenmarkDepartment of Physics and Astronomy, University of Victoria , Victoria, BC, V8W 3P2, CanadaSchool of Astronomy and Space Science, Nanjing University , Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093, People’s Republic of ChinaThe 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 ^−1 and a 1 σ width of 240 pc. We show that the tidal dissolution of an old, lower-mass globular cluster in a cold dark matter (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 ^−1 velocity dispersion is readily accomplished with an evolving CDM subhalo population, a progenitor cluster mass ≃2 × 10 ^4 M _⊙ , and an orbit that keeps the progenitor orbital pericenter within about 10 kpc of the Milky Way dark halo or its precursors.https://doi.org/10.3847/1538-4357/ade4ceDark matterGalaxy dark matter halosCold dark matterMilky Way dark matter halo |
| spellingShingle | Raymond G. Carlberg Rodrigo Ibata Nicolas F. Martin Else Starkenburg David S. Aguado Khyati Malhan Kim Venn Zhen Yuan C-19 and Hot, Wide Star Streams The Astrophysical Journal Dark matter Galaxy dark matter halos Cold dark matter Milky Way dark matter halo |
| title | C-19 and Hot, Wide Star Streams |
| title_full | C-19 and Hot, Wide Star Streams |
| title_fullStr | C-19 and Hot, Wide Star Streams |
| title_full_unstemmed | C-19 and Hot, Wide Star Streams |
| title_short | C-19 and Hot, Wide Star Streams |
| title_sort | c 19 and hot wide star streams |
| topic | Dark matter Galaxy dark matter halos Cold dark matter Milky Way dark matter halo |
| url | https://doi.org/10.3847/1538-4357/ade4ce |
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