M. Messa
The young star cluster population of M51 with LEGUS – I. A comprehensive study of cluster formation and evolution
Messa, M.; Adamo, A.; Östlin, G.; Calzetti, D.; Grasha, K.; Grebel, E.K.; Shabani, F.; Chandar, R.; Dale, D.A.; Dobbs, C.L.; Elmegreen, B.G.; Fumagalli, M.; Gouliermis, D.A.; Kim, H.; Smith, L.J.; Thilker, D.A.; Tosi, M.; Ubeda, L.; Walterbos, R.; Whitmore, B.C.; Fedorenko, K.; Mahadevan, S.; Andrews, J.E.; Bright, S.N.; Cook, D.O.; Kahre, L.; Nair, P.; Pellerin, A.; Ryon, J.E.; Ahmad, S.D.; Beale, L.P.; Brown, K.; Clarkson, D.A.; Guidarelli, G.C.; Parziale, R.; Turner, J.; Weber, M.
Authors
A. Adamo
G. Östlin
D. Calzetti
K. Grasha
E.K. Grebel
F. Shabani
R. Chandar
D.A. Dale
C.L. Dobbs
B.G. Elmegreen
Professor Michele Fumagalli michele.fumagalli@durham.ac.uk
Academic Visitor
D.A. Gouliermis
H. Kim
L.J. Smith
D.A. Thilker
M. Tosi
L. Ubeda
R. Walterbos
B.C. Whitmore
K. Fedorenko
S. Mahadevan
J.E. Andrews
S.N. Bright
D.O. Cook
L. Kahre
P. Nair
A. Pellerin
J.E. Ryon
S.D. Ahmad
L.P. Beale
K. Brown
D.A. Clarkson
G.C. Guidarelli
R. Parziale
J. Turner
M. Weber
Abstract
Recently acquired WFC3 UV (F275W and F336W) imaging mosaics under the Legacy Extragalactic UV Survey (LEGUS), combined with archival ACS data of M51, are used to study the young star cluster (YSC) population of this interacting system. Our newly extracted source catalogue contains 2834 cluster candidates, morphologically classified to be compact and uniform in colour, for which ages, masses and extinction are derived. In this first work we study the main properties of the YSC population of the whole galaxy, considering a mass-limited sample. Both luminosity and mass functions follow a power-law shape with slope −2, but at high luminosities and masses a dearth of sources is observed. The analysis of the mass function suggests that it is best fitted by a Schechter function with slope −2 and a truncation mass at 1.00 ± 0.12 × 105 M⊙. Through Monte Carlo simulations, we confirm this result and link the shape of the luminosity function to the presence of a truncation in the mass function. A mass limited age function analysis, between 10 and 200 Myr, suggests that the cluster population is undergoing only moderate disruption. We observe little variation in the shape of the mass function at masses above 1 × 104 M⊙ over this age range. The fraction of star formation happening in the form of bound clusters in M51 is ∼ 20 per cent in the age range 10–100 Myr and little variation is observed over the whole range from 1 to 200 Myr.
Citation
Messa, M., Adamo, A., Östlin, G., Calzetti, D., Grasha, K., Grebel, E., …Weber, M. (2018). The young star cluster population of M51 with LEGUS – I. A comprehensive study of cluster formation and evolution. Monthly Notices of the Royal Astronomical Society, 473(1), 996-1018. https://doi.org/10.1093/mnras/stx2403
Journal Article Type | Article |
---|---|
Acceptance Date | Sep 14, 2017 |
Online Publication Date | Sep 18, 2017 |
Publication Date | Jan 1, 2018 |
Deposit Date | Nov 7, 2017 |
Publicly Available Date | Nov 8, 2017 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 473 |
Issue | 1 |
Pages | 996-1018 |
DOI | https://doi.org/10.1093/mnras/stx2403 |
Related Public URLs | https://arxiv.org/abs/1709.06101 |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017. The Authors.
Published by Oxford University Press on behalf of the Royal Astronomical Society.
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