Abstract
The Milky Way satellite galaxies show a phase-space distribution that is not expected from the standard scenario of galaxy formation. This is a strong hint at them being of tidal origin, which would naturally explain their spacial distribution in a disc of satellites. It is shown that also their orbital directions can be reproduced with the debris of galaxy collisions. Both co- and counter-orbiting satellites are formed naturally in merger and fly-by interactions.
Highlights
The “classical” Milky Way (MW) satellite galaxies define a disc nearly perpendicular to the MW plane [1]
This is a strong hint at them being of tidal origin, which would naturally explain their spacial distribution in a disc of satellites
Using stellar-dynamical models of galaxy interactions it is tested whether both co- and counter-orbiting tidal debris form in single merger and fly-by interactions
Summary
The “classical” Milky Way (MW) satellite galaxies define a disc nearly perpendicular to the MW plane [1]. Analysing the young halo globular clusters in a similar manner, it is found that they define a similar disc, too [3]. This disc of satellites (DoS) can be described by the normal vector perpendicular it. The alternative scenario suggest that they are tidal dwarf galaxies (TDGs) In this scenario, material was tidally expelled during an early galaxy-interaction (about 10 Gyr ago). Material was tidally expelled during an early galaxy-interaction (about 10 Gyr ago) This tidal debris is naturally aligned in the plane of the interaction. Using stellar-dynamical models of galaxy interactions it is tested whether both co- and counter-orbiting tidal debris form in single merger and fly-by interactions. A parameter scan including interactions with 1-to-1 and 4-to-1 mass ratios of target-to-infalling galaxy is performed, resulting in a total of 74 models, taking more than 200 CPU-days
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.