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Effective Radii of Young, Massive Star Clusters in Two LEGUS Galaxies
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 18
2017 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 841, no 2, 92Article in journal (Refereed) Published
Abstract [en]

We present a study of the effective (half-light) radii and other structural properties of a systematically selected sample of young, massive star clusters (>= 5. x. 10(3) M-circle dot and <= 200 Myr) in two nearby spiral galaxies, NGC. 628 and NGC. 1313. We use Hubble Space Telescope (HST) WFC3/UVIS and archival ACS/WFC data obtained by the Legacy Extragalactic UV Survey (LEGUS), an HST Treasury Program. We measure effective radii with GALFIT, a two-dimensional image-fitting package, and with a new technique to estimate effective radii from the concentration index of observed clusters. The distribution of effective radii from both techniques spans similar to 0.5-10. pc and peaks at 2-3. pc for both galaxies. We find slight positive correlations between effective radius and cluster age in both galaxies, but no significant relationship between effective radius and galactocentric distance. Clusters in NGC. 1313 display a mild increase in effective radius with cluster mass, but the trend disappears when the sample is divided into age bins. We show that the vast majority of the clusters in both galaxies are much older than their dynamical times, suggesting they are gravitationally bound objects. We find that about half of the clusters in NGC. 628 are underfilling their Roche lobes, based on their Jacobi radii. Our results suggest that the young, massive clusters in NGC. 628 and NGC. 1313 are expanding, due to stellar mass loss or two-body relaxation, and are not significantly influenced by the tidal fields of their host galaxies.

Place, publisher, year, edition, pages
2017. Vol. 841, no 2, 92
Keyword [en]
galaxies: general, galaxies: individual (NGC 628, NGC 1313), galaxies: star clusters: general Supporting material: machine-readable tables
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Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-144690DOI: 10.3847/1538-4357/aa719eISI: 000402310800026OAI: oai:DiVA.org:su-144690DiVA: diva2:1128070
Available from: 2017-07-21 Created: 2017-07-21 Last updated: 2017-07-21Bibliographically approved

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Adamo, AngelaMessa, Matteo
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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