paper

PHANGS-JWST First Results: The 21 m Compact Source Population

arXiv:2212.01526 · doi:10.3847/2041-8213/aca8ab

Abstract

We use PHANGS-JWST data to identify and classify 1271 compact 21 m 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 m to 21 m. Using the SED in JWST as well as 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 m sources are strongly spatially associated with HII regions ( of sources), while 74 of sources are coincident with a stellar association defined in the HST data. Using SED fitting, we find that the stellar masses of the 21 m sources span a range of 10 to 10 with mass-weighted ages down to 2 Myr. There is a tight correlation between attenuation-corrected H and 21 m luminosity for . Young embedded source candidates selected at 21 m are found below this threshold and have .

arXiv comment15 pages, 5 figures, Accepted as part of a PHANGS-JWST Focus Issue to appear in ApJ

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