A possible solution to the Milky Way's binary-deficient retrograde stellar population Evidence that omega Centauri has formed in an extreme starburst
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10456046" target="_blank" >RIV/00216208:11320/22:10456046 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-jGnEDYMCa" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-jGnEDYMCa</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/202141846" target="_blank" >10.1051/0004-6361/202141846</a>
Alternative languages
Result language
angličtina
Original language name
A possible solution to the Milky Way's binary-deficient retrograde stellar population Evidence that omega Centauri has formed in an extreme starburst
Original language description
Context. The fraction of field binaries on retrograde orbits about the Milky Way is significantly lower compared to its prograde counterpart. Chemical and dynamical evidence suggests that the retrograde stellar population originates from omega Centauri, which is either the most massive globular cluster (GC) of the Milky Way or the putative core of a former dwarf galaxy. Aims. Star formation conditions required to produce the retrograde binary population are constrained assuming that the retrograde stellar population originates from omega Centauri's progenitor. Methods. We match the observed low binary fraction with dynamical population synthesis models, including a universal initial binary population and dynamical processing in star clusters, making use of the publicly available binary population synthesis tool BIPOS1. Results. It is found that either the GC progenitor of omega Cen must have formed with a stellar density of approximate to 10(8) M-circle dot pc(-3) or the omega Centauri dwarf galaxy's progenitor star cluster population must have formed in an extreme starburst with a star formation rate exceeding 1000 M-circle dot yr(-1) and probably a top-heavy embedded-cluster mass function with suppressed low-mass cluster formation. The separation and mass-ratio distribution for retrograde field binaries are predicted for comparison with future observations. Conclusions. A viable solution for the deficiency of binaries on retrograde orbits is presented, and star formation conditions for omega Centauri as well as orbital parameter distributions for the Milky Way's retrograde binary population are predicted. The dwarf galaxy origin for omega Centauri is tentatively preferred within the present context.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GA20-21855S" target="_blank" >GA20-21855S: The dynamics of dense star clusters with primordial binaries and massive black holes</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy & Astrophysics
ISSN
0004-6361
e-ISSN
1432-0746
Volume of the periodical
659
Issue of the periodical within the volume
březen
Country of publishing house
FR - FRANCE
Number of pages
10
Pages from-to
A96
UT code for WoS article
000771133900001
EID of the result in the Scopus database
2-s2.0-85127211884