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Star Clusters in the Galactic tidal field, from birth to dissolution

Published online by Cambridge University Press:  11 March 2020

Bekdaulet Shukirgaliyev Open the ORCID record for Bekdaulet Shukirgaliyev [Opens in a new window] ,
Genevieve Parmentier ,
Peter Berczik  and
Andreas Just Open the ORCID record for Andreas Just [Opens in a new window]
Bekdaulet Shukirgaliyev
Affiliation:
Energetic Cosmos Laboratory, Nazarbayev University, 53 Kabanbay batyr ave., 010000Nur-Sultan, Kazakhstanb email: bekdaulet.shukirgaliyev@nu.edu.kz Fesenkov Astrophysical Institute, 23 Observatory str., 050020Almaty, Kazakhstan
Genevieve Parmentier
Affiliation:
Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr 12-14, D-69120Heidelberg, Germany
Peter Berczik
Affiliation:
Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr 12-14, D-69120Heidelberg, Germany National Observatories of China, Chinese Academy of Science, 20A Datun Rd, Chaoyang District, 100012Beijing, PR China Main Astronomical Observatory, Academy of Science of Ukraine, 27 Akademika Zabolotnoho St, 03680Kyiv, Ukraine
Andreas Just
Affiliation:
Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr 12-14, D-69120Heidelberg, Germany
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Abstract

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We study the evolution of star clusters in the Galactic tidal field starting from their birth in molecular clumps. Our model clusters form according to the local-density-driven cluster formation model in which the stellar density profile is steeper than that of gas. As a result, clusters resist the gas expulsion better than predicted by earlier models.

We vary the impact of the Galactic tidal field λ, considering different Galactocentric distances (3-18 kpc), as well as different cluster sizes. Our model clusters survive the gas expulsion independent of λ.

We investigated the relation between the cluster mass at the onset of secular evolution and their dissolution time. The model clusters formed with a high star-formation efficiency (SFE) follow a tight mass-dependent dissolution relation, in agreement with previous theoretical studies. However, the low-SFE models present a shallower mass-dependent relation than high-SFE clusters, and most dissolve before reaching 1 Gyr (cluster teenage mortality).

Keywords

stars: formationstars: kinematics(Galaxy:) open clusters and associations: generalgalaxies: star clusters

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