2023
DOI: 10.3847/2041-8213/aca53e
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PHANGS–JWST First Results: A Combined HST and JWST Analysis of the Nuclear Star Cluster in NGC 628

Abstract: We combine archival Hubble Space Telescope and new James Webb Space Telescope imaging data covering the ultraviolet to mid-infrared regime to morphologically analyze the nuclear star cluster (NSC) of NGC 628, a grand-design spiral galaxy. The cluster is located in a 200 pc × 400 pc cavity lacking both dust and gas. We find roughly constant values for the effective radius (r eff ∼ 5 pc) and ellipticity (ϵ ∼ 0.05), while the Sérsic index (n) and position angle (PA) drop from n ∼ 3 to ∼2 and PA … Show more

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Cited by 11 publications
(10 citation statements)
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“…Note that we attribute the high F335M PAH /F770W and F335M PAH /F1130W in the inner 200 pc (∼4″) of NGC 628 to the very low ISM contribution in that region, and not a change in PAH properties (e.g., Dale et al 2006;Hoyer et al 2023).…”
Section: Band Ratiosmentioning
confidence: 82%
“…Note that we attribute the high F335M PAH /F770W and F335M PAH /F1130W in the inner 200 pc (∼4″) of NGC 628 to the very low ISM contribution in that region, and not a change in PAH properties (e.g., Dale et al 2006;Hoyer et al 2023).…”
Section: Band Ratiosmentioning
confidence: 82%
“…We observed NGC 628, NGC 1365, NGC 7496, and IC 5332 with the MIRI imager between 2022 July 6 to August 13 using the F770W, F1000W, F1130W, and F2100W filters. Stellar continuum is only an important contribution to the F770W and F1130W bands toward specific mid-IR bright stars or low-ISM, high-stellar-surface-density regions like the nucleus of NGC 628 (Hoyer et al 2023), which do not make up a significant fraction of the sight lines in our maps. Given the dominance of PAH emission at the F770W and F1130W filters in our targets, we do not attempt any removal of the hot dust continuum using F1000W (which may also include a strong or dominant contribution from PAH emission) or F2100W.…”
Section: Observationsmentioning
confidence: 84%
“…This corresponds to a cut at <0.04r 25 (<1.4 kpc) for NGC 1365 and <0.08r 25 (<0.7 kpc) for NGC 7496. We additionally mask the very central region of NGC 628 (<0.02r 25 or <0.3 kpc) where evolved stellar populations contribute to the F1130W emission in a hole in the ISM distribution near the nuclear star cluster (see Hoyer et al 2023). Error bars show the error on the mean.…”
Section: Pah-to-continuum Ratiosmentioning
confidence: 99%