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  The spatial relation between young star clusters and molecular clouds in M51 with LEGUS

Grasha, K., Calzetti, D., Adamo, A., Kennicutt, R. C., Elmegreen, B. G., Messa, M., et al. (2019). The spatial relation between young star clusters and molecular clouds in M51 with LEGUS. Monthly Notices of the Royal Astronomical Society, 483, 4707-4723.

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Grasha, K.1, Author
Calzetti, D.1, Author
Adamo, A.1, Author
Kennicutt, R. C.1, Author
Elmegreen, B. G.1, Author
Messa, M.1, Author
Dale, D. A.1, Author
Fedorenko, K.1, Author
Mahadevan, S.1, Author
Grebel, E. K.1, Author
Fumagalli, M.1, Author
Kim, H.1, Author
Dobbs, C. L.1, Author
Gouliermis, D. A.1, Author
Ashworth, G.1, Author
Gallagher, J. S.1, Author
Smith, L. J.1, Author
Tosi, M.1, Author
Whitmore, B. C.1, Author
Schinnerer, E.1, Author
Colombo, D.1, AuthorHughes, A.1, AuthorLeroy, A. K.1, AuthorMeidt, S. E.1, Author more..
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: ISM: clouds galaxies: individual (NGC 5194 M 51) galaxies: star clusters: general galaxies: star formation galaxies: stellar content galaxies: structure Astrophysics - Astrophysics of Galaxies
 Abstract: We present a study correlating the spatial locations of young star clusters with those of molecular clouds in NGC 5194, in order to investigate the time-scale over which clusters separate from their birth clouds. The star cluster catalogues are from the Legacy ExtraGalactic UV Survey (LEGUS) and the molecular clouds from the Plateau de Bure Interefrometer Arcsecond Whirpool Survey (PAWS). We find that younger star clusters are spatially closer to molecular clouds than older star clusters. The median age for clusters associated with clouds is 4 Myr, whereas it is 50 Myr for clusters that are sufficiently separated from a molecular cloud to be considered unassociated. After ~6 Myr, the majority of the star clusters lose association with their molecular gas. Younger star clusters are also preferentially located in stellar spiral arms where they are hierarchically distributed in kpc-size regions for 50-100 Myr before dispersing. The youngest star clusters are more strongly clustered, yielding a two-point correlation function with Œ± = -0.28 ¬± 0.04, than the giant molecular cloud (GMCs) (Œ± = -0.09 ¬± 0.03) within the same PAWS field. However, the clustering strength of the most massive GMCs, supposedly the progenitors of the young clusters for a star formation efficiency of a few per cent, is comparable (Œ± = -0.35 ¬± 0.05) to that of the clusters. We find a galactocentric dependence for the coherence of star formation, in which clusters located in the inner region of the galaxy reside in smaller star-forming complexes and display more homogeneous distributions than clusters further from the centre. This result suggests a correlation between the survival of a cluster complex and its environment.

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 Dates: 2019
 Publication Status: Issued
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 483 Sequence Number: - Start / End Page: 4707 - 4723 Identifier: -