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Bright, relatively isolated star clusters in PHANGS–HST galaxies: Aperture corrections, quantitative morphologies, and comparison with synthetic stellar population models

Deger, Sinan and Lee, Janice C. and Whitmore, Bradley C. and Thilker, David A. and Boquien, Médéric and Chandar, Rupali and Dale, Daniel A. and Ubeda, Leonardo and White, Rick and Grasha, Kathryn and Glover, Simon C. O. and Schruba, Andreas and Barnes, Ashley T. and Klessen, Ralf S. and Kruijssen, J. M. Diederik and Rosolowsky, Erik and Williams, Thomas G. (2021) Bright, relatively isolated star clusters in PHANGS–HST galaxies: Aperture corrections, quantitative morphologies, and comparison with synthetic stellar population models. Monthly Notices of the Royal Astronomical Society, 510 (1). pp. 32-53. ISSN 0035-8711. doi:10.1093/mnras/stab3213. https://resolver.caltech.edu/CaltechAUTHORS:20220304-627327000

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Abstract

Using PHANGS–HST NUV-U-B-V-I imaging of 17 nearby spiral galaxies, we study samples of star clusters and stellar associations, visually selected to be bright and relatively isolated, for three purposes: to compute aperture corrections for star cluster photometry, to explore the utility of quantitative morphologies in the analysis of clusters and associations, and to compare to synthetic stellar population models. We provide a technical summary of our procedures to determine aperture corrections, a standard step in the production of star cluster candidate catalogues, and compare to prior work. We also use this specialized sample to launch an analysis into the measurement of star cluster light profiles. We focus on one measure, M₂₀ (normalized second-order moment of the brightest 20 per cent of pixels), applied previously to study the morphologies of galaxies. We find that M₂₀ in combination with UB-VI colours, yields a parameter space where distinct loci are formed by single-peaked symmetric clusters, single-peaked asymmetric clusters, and multipeaked associations. We discuss the potential applications for using M₂₀ to gain insight into the formation and evolution of clusters and associations. Finally, we compare the colour distributions of this sample with various synthetic stellar population models. One finding is that the standard procedure of using a single-metallicity SSP track to fit the entire population of clusters in a given galaxy should be revisited, as the oldest globular clusters will be more metal-poor compared to clusters formed recently.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/stab3213DOIArticle
https://doi.org/10.48550/arXiv.2110.10708arXivDiscussion Paper
https://doi.org/10.17909/t9-r08f-dq31DOIHigh level science products, including science ready mosaicked imaging, associated with HST GO-15654
ORCID:
AuthorORCID
Deger, Sinan0000-0003-1943-723X
Lee, Janice C.0000-0002-2278-9407
Whitmore, Bradley C.0000-0002-3784-7032
Thilker, David A.0000-0002-8528-7340
Boquien, Médéric0000-0003-0946-6176
Chandar, Rupali0000-0003-0085-4623
Dale, Daniel A.0000-0002-5782-9093
Grasha, Kathryn0000-0002-3247-5321
Glover, Simon C. O.0000-0001-6708-1317
Barnes, Ashley T.0000-0003-0410-4504
Klessen, Ralf S.0000-0002-0560-3172
Kruijssen, J. M. Diederik0000-0002-8804-0212
Rosolowsky, Erik0000-0002-5204-2259
Williams, Thomas G.0000-0002-0012-2142
Additional Information:© 2021 The Author(s) Published by Oxford University Press on behalf of 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 2021 October 20. Received 2021 October 19; in original form 2021 June 11. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. Support for Program number 15654 was provided through a grant from the STScI under NASA contract NAS5-26555. 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. JMDK gratefully acknowledges funding from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through an Emmy Noether Research Group (grant number KR4801/1-1) and the DFG Sachbeihilfe (grant number KR4801/2-1), as well as from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme via the ERC Starting Grant MUSTANG (grant agreement number 714907). SCOG and RSK acknowledge support from the DFG via SFB 881 ‘The Milky Way System’ (sub-projects B1, B2, and B8) and from the Heidelberg cluster of excellence EXC 2181-390900948 ‘STRUCTURES: A unifying approach to emergent phenomena in the physical world, mathematics, and complex data’, funded by the German Excellence Strategy. They also acknowledge funding from the European Research Council via the ERC Synergy Grant ‘ECOGAL’ (grant 855130). TGW acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 694343). ATB would like to acknowledge funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No.726384/Empire). DATA AVAILABILITY. The imaging observations underlying this article can be retrieved from the Mikulski Archive for Space Telescopes at https://archive.stsci.edu/hst/search_retrieve.html under proposal GO-15654. High level science products, including science ready mosaicked imaging, associated with HST GO-15654 are provided at https://archive.stsci.edu/hlsp/phangs-hst with digital object identifier doi:10.17909/t9-r08f-dq31
Group:Infrared Processing and Analysis Center (IPAC), TAPIR
Funders:
Funding AgencyGrant Number
NASANAS5-26555
NASA/JPL/CaltechUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)KR4801/1-1
Deutsche Forschungsgemeinschaft (DFG)KR4801/2-1
European Research Council (ERC)714907
Deutsche Forschungsgemeinschaft (DFG)SFB 881
Deutsche Forschungsgemeinschaft (DFG)EXC 2181-390900948
European Research Council (ERC)855130
European Research Council (ERC)726384
Subject Keywords:galaxies: star clusters: general, galaxies: star formation
Issue or Number:1
DOI:10.1093/mnras/stab3213
Record Number:CaltechAUTHORS:20220304-627327000
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20220304-627327000
Official Citation:Sinan Deger, Janice C Lee, Bradley C Whitmore, David A Thilker, Mederic Boquien, Rupali Chandar, Daniel A Dale, Leonardo Ubeda, Rick White, Kathryn Grasha, Simon C O Glover, Andreas Schruba, Ashley T Barnes, Ralf Klessen, J M Diederik Kruijssen, Erik Rosolowsky, Thomas G Williams, Bright, relatively isolated star clusters in PHANGS–HST galaxies: Aperture corrections, quantitative morphologies, and comparison with synthetic stellar population models, Monthly Notices of the Royal Astronomical Society, Volume 510, Issue 1, February 2022, Pages 32–53, https://doi.org/10.1093/mnras/stab3213
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113738
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:07 Mar 2022 18:02
Last Modified:25 Jul 2022 23:14

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