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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29465
Title: The Gaia-ESO Survey: asymmetric expansion of the Lagoon Nebula cluster NGC 6530 from GES and Gaia DR2
Authors: Wright, Nicholas J.
Jeffries, R. D.
Jackson, R. J.
Bayo, A.
Bonito, Rosaria 
DAMIANI, Francesco 
Kalari, V.
Lanzafame, Alessandro Carmelo 
PANCINO, ELENA 
Parker, R. J.
PRISINZANO, Loredana 
RANDICH, Maria Sofia 
Vink, J. S.
Alfaro, E. J.
Bergemann, M.
FRANCIOSINI, Elena 
Gilmore, G.
Gonneau, A.
Hourihane, A.
Jofré, P.
Koposov, S. E.
Lewis, J.
MAGRINI, LAURA 
MICELA, Giuseppina 
MORBIDELLI, LORENZO 
SACCO, GIUSEPPE GERMANO 
Worley, C. C.
ZAGGIA, Simone 
Issue Date: 2019
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 486
Issue: 2
First Page: 2477
Abstract: The combination of precise radial velocities from multi-object spectroscopy and highly accurate proper motions from Gaia DR2 opens up the possibility for detailed 3D kinematic studies of young star-forming regions and clusters. Here, we perform such an analysis by combining Gaia-ESO Survey spectroscopy with Gaia astrometry for ∼900 members of the Lagoon Nebula cluster, NGC 6530. We measure the 3D velocity dispersion of the region to be 5.35^{+0.39}_{-0.34} km s<SUP>-1</SUP>, which is large enough to suggest the region is gravitationally unbound. The velocity ellipsoid is anisotropic, implying that the region is not sufficiently dynamically evolved to achieve isotropy, though the central part of NGC 6530 does exhibit velocity isotropy that suggests sufficient mixing has occurred in this denser part. We find strong evidence that the stellar population is expanding, though this is preferentially occurring in the declination direction and there is very little evidence for expansion in the right ascension direction. This argues against a simple radial expansion pattern, as predicted by models of residual gas expulsion. We discuss these findings in the context of cluster formation, evolution, and disruption theories.
URI: http://hdl.handle.net/20.500.12386/29465
URL: http://arxiv.org/abs/1903.12176v1
https://academic.oup.com/mnras/article-abstract/486/2/2477/5420759?redirectedFrom=fulltext
ISSN: 0035-8711
DOI: 10.1093/mnras/stz870
Bibcode ADS: 2019MNRAS.486.2477W
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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