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Star cluster catalogues for the LEGUS dwarf galaxies

Cook, DO; Lee, JC; Adamo, A; Kim, H; Chandar, R; Whitmore, BC; Mok, A; Ryon, JE; Dale, DA; Calzetti, D; Andrews, JE; Aloisi, A; Ashworth, G; Bright, SN; Brown, TM; Christian, C; Cignoni, M; Clayton, GC; da Silva, R; de Mink, SE; Dobbs, CL; Elmegreen, BG; Elmegreen, DM; Evans, AS; Fumagalli, M; Gallagher, JS; Gouliermis, DA; Grasha, K; Grebel, EK; Herrero, A; Hunter, DA; Jensen, EI; Johnson, KE; Kahre, L; Kennicutt, RC; Krumholz, MR; Lee, NJ; Lennon, D; Linden, S; Martin, C; Messa, M; Nair, P; Nota, A; Östlin, G; Parziale, RC; Pellerin, A; Regan, MW; Sabbi, E; Sacchi, E; Schaerer, D; Schiminovich, D; Shabani, F; Slane, FA; Small, J; Smith, CL; Smith, LJ; Taibi, S; Thilker, DA; de la Torre, IC; Tosi, M; Turner, JA; Ubeda, L; Van Dyk, SD; Walterbos, R AM; Wofford, A

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Authors

DO Cook

JC Lee

A Adamo

H Kim

R Chandar

BC Whitmore

A Mok

JE Ryon

DA Dale

D Calzetti

JE Andrews

A Aloisi

G Ashworth

SN Bright

TM Brown

C Christian

M Cignoni

GC Clayton

R da Silva

SE de Mink

CL Dobbs

BG Elmegreen

DM Elmegreen

AS Evans

JS Gallagher

DA Gouliermis

K Grasha

EK Grebel

A Herrero

DA Hunter

EI Jensen

KE Johnson

L Kahre

RC Kennicutt

MR Krumholz

NJ Lee

D Lennon

S Linden

C Martin

M Messa

P Nair

A Nota

G Östlin

RC Parziale

A Pellerin

MW Regan

E Sabbi

E Sacchi

D Schaerer

D Schiminovich

F Shabani

FA Slane

J Small

CL Smith

LJ Smith

S Taibi

DA Thilker

IC de la Torre

M Tosi

JA Turner

L Ubeda

SD Van Dyk

R AM Walterbos

A Wofford



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 ≈104.5M⊙ but cannot rule out the existence of a truncation at higher masses.

Citation

Cook, D., Lee, J., Adamo, A., Kim, H., Chandar, R., Whitmore, B., …Wofford, A. (2019). Star cluster catalogues for the LEGUS dwarf galaxies. Monthly Notices of the Royal Astronomical Society, 484(4), 4897-4919. https://doi.org/10.1093/mnras/stz331

Journal Article Type Article
Acceptance Date Jan 25, 2019
Online Publication Date Feb 1, 2019
Publication Date Apr 21, 2019
Deposit Date Mar 14, 2019
Publicly Available Date Mar 29, 2024
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 484
Issue 4
Pages 4897-4919
DOI https://doi.org/10.1093/mnras/stz331

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Copyright Statement
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.





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