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The Resolved Stellar Populations in the LEGUS Galaxies1

Sabbi, E.; Calzetti, D.; Ubeda, L.; Adamo, A.; Cignoni, M.; Thilker, D.; Aloisi, A.; Elmegreen, B.G.; Elmegreen, D.M.; Gouliermis, D.A.; Grebel, E.K.; Messa, M.; Smith, L.J.; Tosi, M.; Dolphin, A.; Andrews, J.E.; Ashworth, G.; Bright, S.N.; Brown, T.M.; Chandar, R.; Christian, C.; Clayton, G.C.; Cook, D.O.; Dale, D.A.; de Mink, S.E.; Dobbs, C.; Evans, A.S.; Fumagalli, M.; Gallagher, J.S.; Grasha, K.; Herrero, A.; Hunter, D.A.; Johnson, K.E.; Kahre, L.; Kennicutt, R.C.; Kim, H.; Krumholz, M.R.; Lee, J.C.; Lennon, D.; Martin, C.; Nair, P.; Nota, A.; Östlin, G.; Pellerin, A.; Prieto, J.; Regan, M.W.; Ryon, J.E.; Sacchi, E.; Schaerer, D.; Schiminovich, D.; Shabani, F.; Van Dyk, S.D.; Walterbos, R.; Whitmore, B.C.; Wofford, A.

The Resolved Stellar Populations in the LEGUS Galaxies1 Thumbnail


Authors

E. Sabbi

D. Calzetti

L. Ubeda

A. Adamo

M. Cignoni

D. Thilker

A. Aloisi

B.G. Elmegreen

D.M. Elmegreen

D.A. Gouliermis

E.K. Grebel

M. Messa

L.J. Smith

M. Tosi

A. Dolphin

J.E. Andrews

G. Ashworth

S.N. Bright

T.M. Brown

R. Chandar

C. Christian

G.C. Clayton

D.O. Cook

D.A. Dale

S.E. de Mink

C. Dobbs

A.S. Evans

J.S. Gallagher

K. Grasha

A. Herrero

D.A. Hunter

K.E. Johnson

L. Kahre

R.C. Kennicutt

H. Kim

M.R. Krumholz

J.C. Lee

D. Lennon

C. Martin

P. Nair

A. Nota

G. Östlin

A. Pellerin

J. Prieto

M.W. Regan

J.E. Ryon

E. Sacchi

D. Schaerer

D. Schiminovich

F. Shabani

S.D. Van Dyk

R. Walterbos

B.C. Whitmore

A. Wofford



Abstract

The Legacy ExtraGalactic UV Survey (LEGUS) is a multiwavelength Cycle 21 Treasury program on the Hubble Space Telescope. It studied 50 nearby star-forming galaxies in 5 bands from the near-UV to the I-band, combining new Wide Field Camera 3 observations with archival Advanced Camera for Surveys data. LEGUS was designed to investigate how star formation occurs and develops on both small and large scales, and how it relates to the galactic environments. In this paper we present the photometric catalogs for all the apparently single stars identified in the 50 LEGUS galaxies. Photometric catalogs and mosaicked images for all filters are available for download. We present optical and near-UV color–magnitude diagrams for all the galaxies. For each galaxy we derived the distance from the tip of the red giant branch. We then used the NUV color–magnitude diagrams to identify stars more massive than 14 M ⊙, and compared their number with the number of massive stars expected from the GALEX FUV luminosity. Our analysis shows that the fraction of massive stars forming in star clusters and stellar associations is about constant with the star formation rate. This lack of a relation suggests that the timescale for evaporation of unbound structures is comparable or longer than 10 Myr. At low star formation rates this translates to an excess of mass in clustered environments as compared to model predictions of cluster evolution, suggesting that a significant fraction of stars form in unbound systems.

Citation

Sabbi, E., Calzetti, D., Ubeda, L., Adamo, A., Cignoni, M., Thilker, D., …Wofford, A. (2018). The Resolved Stellar Populations in the LEGUS Galaxies1. Astrophysical Journal Supplement, 235(1), Article 23. https://doi.org/10.3847/1538-4365/aaa8e5

Journal Article Type Article
Acceptance Date Jan 9, 2018
Online Publication Date Mar 15, 2018
Publication Date Mar 15, 2018
Deposit Date Mar 22, 2018
Publicly Available Date Mar 22, 2018
Journal Astrophysical Journal Supplement
Print ISSN 0067-0049
Electronic ISSN 1538-4365
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 235
Issue 1
Article Number 23
DOI https://doi.org/10.3847/1538-4365/aaa8e5

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Copyright Statement
© 2018. The American Astronomical Society. All rights reserved.





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