Mass-loss from massive globular clusters in tidal fields

• Verfasst von: Meiron, Yohai [VerfasserIn]
• Verfasst von: Webb, Jeremy J [VerfasserIn]
• Verfasst von: Hong, Jongsuk [VerfasserIn]
• Verfasst von: Berczik, Peter [VerfasserIn]
• Verfasst von: Spurzem, Rainer [VerfasserIn]
• Verfasst von: Carlberg, Raymond G [VerfasserIn]
• Titel: Mass-loss from massive globular clusters in tidal fields
• Verf.angabe: Yohai Meiron, Jeremy J. Webb, Jongsuk Hong, Peter Berczik, Rainer Spurzem and Raymond G. Carlberg
• E-Jahr: 2021
• Jahr: 2021 March 8
• Umfang: 10 S.
• Fussnoten: Gesehen am 24.02.2022
• Titel Quelle: Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
• Ort Quelle: Oxford : Oxford Univ. Press, 1827
• Jahr Quelle: 2021
• Band/Heft Quelle: 503(2021), 2 vom: Mai, Seite 3000-3009
• ISSN Quelle: 1365-2966
• DOI: doi:10.1093/mnras/stab649
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1793827893

Abstract

Massive globular clusters lose stars via internal and external processes. Internal processes include mainly two-body relaxation, while external processes include interactions with the Galactic tidal field. We perform a suite of N-body simulations of such massive clusters using three different direct-summation N-body codes, exploring different Galactic orbits and particle numbers. By inspecting the rate at which a star’s energy changes as it becomes energetically unbound from the cluster, we can neatly identify two populations we call kicks and sweeps that escape through two-body encounters internal to the cluster and the external tidal field, respectively. We find that for a typical halo globular cluster on a moderately eccentric orbit, sweeps are far more common than kicks but the total mass-loss rate is so low that these clusters can survive for tens of Hubble times. The different N-body codes give largely consistent results, but we find that numerical artefacts may arise in relation to the time-step parameter of the Hermite integration scheme, namely that the value required for convergent results is sensitive to the number of particles.