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Star cluster catalogues for the LEGUS dwarf galaxies

Cook, D. O. and Martin, C. and Lee, J. C. and Van Dyk, S. D. (2019) Star cluster catalogues for the LEGUS dwarf galaxies. Monthly Notices of the Royal Astronomical Society, 484 (4). pp. 4897-4919. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20190415-151755923

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Abstract

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 ≈10^(4.5)M⊙ but cannot rule out the existence of a truncation at higher masses.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/stz331DOIArticle
https://arxiv.org/abs/1902.00082arXivDiscussion Paper
ORCID:
AuthorORCID
Cook, D. O.0000-0002-6877-7655
Martin, C.0000-0002-8650-1644
Lee, J. C.0000-0002-2278-9407
Van Dyk, S. D.0000-0001-9038-9950
Alternate Title:Star Cluster Catalogs for the LEGUS Dwarf Galaxies
Additional Information:© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). Accepted 2019 January 25. Received 2019 January 24; in original form 2018 September 8. Published: 01 February 2019. We thank the referee for their helpful comments. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program # 13364. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. AA acknowledges the support of the Swedish Research Council (Vetenskapsradet) and the Swedish National Space Board (SNSB). DAG acknowledges support by the German Aerospace Center (DLR) and the Federal Ministry for Economic Affairs and Energy (BMWi) through program 50OR1801 ‘MYSST: Mapping Young Stars in Space and Time’.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASANAS 5-26555
NASA/JPL/CaltechUNSPECIFIED
VetenskapsradetUNSPECIFIED
Swedish National Space Board (SNSB)UNSPECIFIED
Deutsches Zentrum für Luft- und Raumfahrt (DLR)UNSPECIFIED
Bundesministerium für Wirtschaft und Energie (BMWi)50OR1801
Subject Keywords:galaxies: dwarf – galaxies: irregular – Local Group – galaxies: photometry – galaxies: star clusters: general – galaxies: spiral
Issue or Number:4
Record Number:CaltechAUTHORS:20190415-151755923
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190415-151755923
Official Citation:D O Cook, J C Lee, A Adamo, H Kim, R Chandar, B C Whitmore, A Mok, J E Ryon, D A Dale, D Calzetti, J E Andrews, A Aloisi, G Ashworth, S N Bright, T M Brown, C Christian, M Cignoni, G C Clayton, R da Silva, S E de Mink, C L Dobbs, B G Elmegreen, D M Elmegreen, A S Evans, M Fumagalli, J S Gallagher, D A Gouliermis, K Grasha, E K Grebel, A Herrero, D A Hunter, E I Jensen, K E Johnson, L Kahre, R C Kennicutt, M R Krumholz, N J Lee, D Lennon, S Linden, C Martin, M Messa, P Nair, A Nota, G Östlin, R C Parziale, A Pellerin, M W Regan, E Sabbi, E Sacchi, D Schaerer, D Schiminovich, F Shabani, F A Slane, J Small, C L Smith, L J Smith, S Taibi, D A Thilker, I C de la Torre, M Tosi, J A Turner, L Ubeda, S D Van Dyk, R AM Walterbos, A Wofford, Star cluster catalogues for the LEGUS dwarf galaxies, Monthly Notices of the Royal Astronomical Society, Volume 484, Issue 4, April 2019, Pages 4897–4919, https://doi.org/10.1093/mnras/stz331
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94719
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Apr 2019 21:32
Last Modified:09 Mar 2020 22:47

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