Author
Hassani, H.Rosolowsky, E.
Leroy, A.K.
Boquien, M.
Lee, J.C.
Barnes, A.T.
Belfiore, F.
Bigiel, F.
Cao, Y.
Chevance, M.
Dale, D.A.
Egorov, O.V.
Emsellem, E.
Faesi, C.M.
Grasha, K.

Kim, J.
Klessen, R.S.
Kreckel, K.
Kruijssen, J.M.D.
Larson, K.L.
Meidt, S.E.
Sandstrom, K.M.
Schinnerer, E.
Thilker, D.A.
Watkins, E.J.
Whitmore, B.C.
Williams, T.G.
Affiliation
Steward Observatory, University of ArizonaIssue Date
2023-02-16
Metadata
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American Astronomical SocietyCitation
Hamid Hassani et al 2023 ApJL 944 L21Journal
Astrophysical Journal LettersRights
© 2023. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
We use PHANGS-James Webb Space Telescope (JWST) data to identify and classify 1271 compact 21 μm sources in four nearby galaxies using MIRI F2100W data. We identify sources using a dendrogram-based algorithm, and we measure the background-subtracted flux densities for JWST bands from 2 to 21 μm. Using the spectral energy distribution (SED) in JWST and HST bands plus ALMA and MUSE/VLT observations, we classify the sources by eye. Then we use this classification to define regions in color-color space and so establish a quantitative framework for classifying sources. We identify 1085 sources as belonging to the ISM of the target galaxies with the remainder being dusty stars or background galaxies. These 21 μm sources are strongly spatially associated with H ii regions (>92% of sources), while 74% of the sources are coincident with a stellar association defined in the HST data. Using SED fitting, we find that the stellar masses of the 21 μm sources span a range of 102-104 M ⊙ with mass-weighted ages down to 2 Myr. There is a tight correlation between attenuation-corrected Hα and 21 μm luminosity for L ν,F2100W > 1019 W Hz−1. Young embedded source candidates selected at 21 μm are found below this threshold and have M ⋆ < 103 M ⊙ © 2023. The Author(s). Published by the American Astronomical Society.Note
Open access journalISSN
2041-8205Version
Final Published Versionae974a485f413a2113503eed53cd6c53
10.3847/2041-8213/aca8ab
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Except where otherwise noted, this item's license is described as © 2023. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.