Abstract
Historically, it has been assumed that globular and open clusters never interact. However, recent evidence suggests that: globular clusters passing through the disk may be able to perturb giant molecular clouds (GMCs) triggering formation of open clusters and some old open clusters may be linked to accreted globulars. Here, we further explore the existence of possible dynamical connections between globular and open clusters, and realize that the most obvious link must be in the form of gravitational interactions. If open clusters are born out of GMCs, they have to move in similar orbits. If we accept that globulars can interact with GMCs, triggering star formation, it follows that globular and open clusters must also interact. Consistently, theoretical arguments as well as observational evidence, show that globular and open clusters certainly are interacting populations and their interactions are far more common than usually thought, especially for objects part of the bulge/disk. Monte Carlo calculations confirm that conclusion. Globular clusters seem capable of not only inducing formation of open clusters but, more often, their demise. Relatively frequent high speed cluster encounters or cluster harassment may also cause, on the long-term, slow erosion and tidal truncation on the globulars involved. The disputed object FSR 1767 (2MASS-GC04) may be, statistically speaking, the best example of an ongoing interaction.
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Acknowledgements
The authors would like to thank the anonymous referee for his/her very constructive report and helpful suggestions, and Edward Cackett for providing his unpublished Chandra results on FSR 1767. RFM and CFM acknowledge partial support by the Spanish ‘Comunidad de Madrid’ under grant CAM S2009/ESP-1496. This research has made use of NASA’s Astrophysics Data System Bibliographic Services and the ASTRO-PH e-print server. In preparation of this paper, we made use of the WEBDA database operated at the Institute of Astronomy of the University of Vienna, Austria. This work also has made extensive use of the SIMBAD database and the VizieR catalogue access tool, operated at the CDS, Strasbourg, France.
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de la Fuente Marcos, R., de la Fuente Marcos, C. & Reilly, D. Gravitational interactions between globular and open clusters: an introduction. Astrophys Space Sci 349, 379–400 (2014). https://doi.org/10.1007/s10509-013-1635-7
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DOI: https://doi.org/10.1007/s10509-013-1635-7