Sangam: A Confluence of Knowledge Streams

The Resolved Stellar Populations in the LEGUS Galaxies1

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dc.creator Sabbi, E
dc.creator Calzetti, D
dc.creator Ubeda, L
dc.creator Adamo, A
dc.creator Cignoni, M
dc.creator Thilker, D
dc.creator Aloisi, A
dc.creator Elmegreen, BG
dc.creator Elmegreen, DM
dc.creator Gouliermis, DA
dc.creator Grebel, EK
dc.creator Messa, M
dc.creator Smith, LJ
dc.creator Tosi, M
dc.creator Dolphin, A
dc.creator Andrews, JE
dc.creator Ashworth, G
dc.creator Bright, SN
dc.creator Brown, TM
dc.creator Chandar, R
dc.creator Christian, C
dc.creator Clayton, GC
dc.creator Cook, DO
dc.creator Dale, DA
dc.creator De Mink, SE
dc.creator Dobbs, C
dc.creator Evans, AS
dc.creator Fumagalli, M
dc.creator Gallagher, JS
dc.creator Grasha, K
dc.creator Herrero, A
dc.creator Hunter, DA
dc.creator Johnson, KE
dc.creator Kahre, L
dc.creator Kennicutt, RC
dc.creator Kim, H
dc.creator Krumholz, MR
dc.creator Lee, JC
dc.creator Lennon, D
dc.creator Martin, C
dc.creator Nair, P
dc.creator Nota, A
dc.creator Ostlin, G
dc.creator Pellerin, A
dc.creator Prieto, J
dc.creator Regan, MW
dc.creator Ryon, JE
dc.creator Sacchi, E
dc.creator Schaerer, D
dc.creator Schiminovich, D
dc.creator Shabani, F
dc.creator Van Dyk, SD
dc.creator Walterbos, R
dc.creator Whitmore, BC
dc.creator Wofford, A
dc.date 2018-11-23T15:48:56Z
dc.date 2018-03-15
dc.date 2018-11-23T15:48:56Z
dc.date.accessioned 2022-05-27T01:03:12Z
dc.date.available 2022-05-27T01:03:12Z
dc.identifier Vol. 235 (1), article 23
dc.identifier 10.3847/1538-4365/aaa8e5
dc.identifier http://hdl.handle.net/10871/34895
dc.identifier 0067-0049
dc.identifier Astrophysical Journal, Supplement Series
dc.identifier.uri http://localhost:8080/xmlui/handle/CUHPOERS/241933
dc.description This is the final version. Available from American Astronomical Society via the DOI in this record
dc.description 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 Mo, 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.
dc.description A.A. acknowledges partial support from the Swedish Royal Academy. G.A. acknowledges support from the Science and Technology Facilities Council (ST/L00075X/1 and ST/ M503472/1). C.D. acknowledges funding from the FP7 ERC starting grant LOCALSTAR (no. 280104). M.F. acknowledges support by the Science and Technology Facilities Council (grant number ST/L00075X/1). D.A.G. kindly acknowledges financial support by the German Research Foundation (DFG) through program GO1659/3-2. These observations are associated with program # 13364. Support for program # 13364 was provided by NASA through a grant from the Space Telescope Science Institute. This work is based on observations obtained with the NASA/ESA Hubble Space Telescope, 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.
dc.language en
dc.publisher American Astronomical Society / IOP Publishing
dc.rights © 2018. The American Astronomical Society. All rights reserved..
dc.subject galaxies: star clusters: general
dc.subject galaxies: star formation
dc.subject galaxies: stellar content
dc.subject stars: formation
dc.subject Hertzsprung-Russell and C–M diagrams
dc.title The Resolved Stellar Populations in the LEGUS Galaxies1
dc.type Article


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