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Star cluster catalogues for the LEGUS dwarf galaxies.

Cook, D.O. and Lee, J.C. and Adamo, A. and Kim, H.S. and Chandar, R. and Whitmore, B.C. and Mok, A. and Ryon, J.E. and Dale, D.A. and Calzetti, D. and Andrews, J.E. and Aloisi, A. and Ashworth, G. and Bright, S.N. and Brown, T.M. and Christian, C. and Cignoni, M. and Clayton, G.C. and da Silva, R. and de Mink, S.E. and Dobbs, C.L. and Elmegreen, B.G. and Elmegreen, D.M. and Evans, A.S. and Fumagalli, M. and Gallagher, J.S. and Gouliermis, D.A. and Grasha, K. and Grebel, E.K. and Herrero, A. and Hunter, D.A. and Jensen, E.I. and Johnson, K.E. and Kahre, L. and Kennicutt, R.C. and Krumholz, M.R. and Lee, N.J. and Lennon, D. and Linden, S. and Martin, C. and Messa, M. and Nair, P. and Nota, A. and Östlin, G. and Parziale, R.C. and Pellerin, A. and Regan, M.W. and Sabbi, E. and Sacchi, E. and Schaerer, D. and Schiminovich, D. and Shabani, F. and Slane, F.A. and Small, J. and Smith, C.L. and Smith, L.J. and Taibi, S. and Thilker, D.A. and de la Torre, I.C. and Tosi, M. and Turner, J.A. and Ubeda, L. and Van Dyk, S.D. and Walterbos, R.A.M. and Wofford, A. (2019) 'Star cluster catalogues for the LEGUS dwarf galaxies.', Monthly notices of the Royal Astronomical Society., 484 (4). pp. 4897-4919.


We present the star cluster catalogues for 17 dwarf and irregular galaxies in the HST Treasury Program ‘Legacy ExtraGalactic UV Survey’ (LEGUS). Cluster identification and photometry in this sub-sample are similar to that of the entire LEGUS sample, but special methods were developed to provide robust catalogues with accurate fluxes due to low cluster statistics. The colours and ages are largely consistent for two widely used aperture corrections, but a significant fraction of the clusters are more compact than the average training cluster. However, the ensemble luminosity, mass, and age distributions are consistent suggesting that the systematics between the two methods are less than the random errors. When compared with the clusters from previous dwarf galaxy samples, we find that the LEGUS catalogues are more complete and provide more accurate total fluxes. Combining all clusters into a composite dwarf galaxy, we find that the luminosity and mass functions can be described by a power law with the canonical index of −2 independent of age and global SFR binning. The age distribution declines as a power law, with an index of ≈− 0.80 ± 0.15, independent of cluster mass and global SFR binning. This decline of clusters is dominated by cluster disruption since the combined star formation histories and integrated-light SFRs are both approximately constant over the last few hundred Myr. Finally, we find little evidence for an upper-mass cut-off (<2σ) in the composite cluster mass function, and can rule out a truncation mass below ≈104.5M⊙ but cannot rule out the existence of a truncation at higher masses.

Item Type:Article
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Publisher statement:© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
Date accepted:25 January 2019
Date deposited:14 March 2019
Date of first online publication:01 February 2019
Date first made open access:14 March 2019

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