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Star formation at the Galactic Centre: coevolution of multiple young stellar discs

Mastrobuono-Battisti, Alessandra, Perets, Hagai B., Gualandris, Alessia, Neumayer, Nadine and Sippel, Anna C. (2019) Star formation at the Galactic Centre: coevolution of multiple young stellar discs Monthly Notices of the Royal Astronomical Society.

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Abstract

Studies of the Galactic Centre suggest that in-situ star formation may have given rise to the observed stellar population near the central supermassive black hole (SMBH). Direct evidence for a recent starburst is provided by the currently observed young stellar disc (2-7Myr) in the central 0:5 pc of the Galaxy. This result suggests that star formation in galactic nuclei may occur close to the SMBH and produce initially attened stellar discs. Here we explore the possible build-up and evolution of nuclear stellar clusters near SMBHs through in-situ star formation producing stellar discs similar to those observed in the Galactic Centre and other nuclei. We make use of N-body simulations to model the evolution of multiple young stellar discs, and explore the potential observable signatures imprinted by such processes. Each of the five simulated discs is evolved for 100Myr before the next one is introduced in the system. We find that populations born at different epochs show different morphologies and kinematics. Older and presumably more metal poor populations are more relaxed and extended, while younger populations show a larger amount of rotation and attening. We conclude that star formation in central discs can reproduce the observed properties of multiple stellar populations in galactic nuclei differing in age, metallicity and kinematic properties.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Mastrobuono-Battisti, Alessandra
Perets, Hagai B.
Gualandris, Alessiaa.gualandris@surrey.ac.uk
Neumayer, Nadine
Sippel, Anna C.
Date : 24 October 2019
DOI : 10.1093/mnras/stz3004
Copyright Disclaimer : © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Uncontrolled Keywords : Galaxy: centre; Galaxy: nucleus; Galaxy: formation; Galaxy: evolution; Stars: formation; Stars: kinematics and dynamics
Depositing User : Diane Maxfield
Date Deposited : 08 Nov 2019 13:21
Last Modified : 08 Nov 2019 13:21
URI: http://epubs.surrey.ac.uk/id/eprint/853091

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