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The Resolved Stellar Populations in the LEGUS Galaxies1

Sabbi, E. and Cook, D. O. and Van Dyk, S. D. (2018) The Resolved Stellar Populations in the LEGUS Galaxies1. Astrophysical Journal Supplement Series, 235 (1). Art. No. 23. ISSN 1538-4365. doi:10.3847/1538-4365/aaa8e5.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Sabbi, E.0000-0003-2954-7643
Cook, D. O.0000-0002-6877-7655
Van Dyk, S. D.0000-0001-9038-9950
Additional Information:© 2018 The American Astronomical Society. Received 2017 November 3; revised 2018 January 5; accepted 2018 January 9; published 2018 March 15. Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA Inc., under NASA contract NAS 5-26555. We thank the referee Nate Bastian for the constructive suggestions that considerably improved the paper. 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. Facilities: HST (WFC3 - , ACS).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Swedish Royal AcademyUNSPECIFIED
Science and Technology Facilities Council (STFC)ST/L00075X/1
Science and Technology Facilities Council (STFC)ST/M503472/1
European Research Council (ERC)280104
Deutsche Forschungsgemeinschaft (DFG)GO1659/3-2
Space Telescope Science InstituteUNSPECIFIED
NASANAS 5-26555
Subject Keywords:galaxies: star clusters: general – galaxies: star formation – galaxies: stellar content – Hertzsprung–Russell and C–M diagrams – stars: formation
Issue or Number:1
Record Number:CaltechAUTHORS:20180405-161427807
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Official Citation:E. Sabbi et al 2018 ApJS 235 23
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85669
Deposited By: Tony Diaz
Deposited On:05 Apr 2018 23:23
Last Modified:15 Nov 2021 20:31

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