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Bohn, Thomas; Inami, Hanae; Diaz-Santos, Tanio; Armus, Lee; Linden, S. T.; U, Vivian; Surace, Jason; Larson, Kirsten L.; Evans, Aaron S.; Hoshioka, Shunshi; Lai, Thomas; Song, Yiqing; Mazzarella, Joseph M.; Barcos-Munoz, Loreto; Charmandaris, Vassilis; Howell, Justin H.; Medling, Anne M.; Privon, George C.; Rich, Jeffrey A.; Stierwalt, Sabrina; Aalto, Susanne; Böker, Torsten; Brown, Michael J. I.; Iwasawa, Kazushi; Malkan, Matthew A.; van der Werf, Paul P.; Appleton, Philip; Hayward, Christopher C.; Kemper, Francisca; Law, David; Marshall, Jason; Murphy, Eric J.; Sanders, David
Astrophysical journal. Letters, 01/2023, Letnik: 942, Številka: 2Journal Article
Abstract We present James Webb Space Telescope (JWST) imaging of NGC 7469 with the Near-Infrared Camera and the Mid-InfraRed Instrument. NGC 7469 is a nearby, z = 0.01627, luminous infrared galaxy that hosts both a Seyfert Type-1.5 nucleus and a circumnuclear starburst ring with a radius of ∼0.5 kpc. The new near-infrared (NIR) JWST imaging reveals 66 star-forming regions, 37 of which were not detected by Hubble Space Telescope (HST) observations. Twenty-eight of the 37 sources have very red NIR colors that indicate obscurations up to A v ∼ 7 and a contribution of at least 25% from hot dust emission to the 4.4 μ m band. Their NIR colors are also consistent with young (<5 Myr) stellar populations and more than half of them are coincident with the mid-infrared (MIR) emission peaks. These younger, dusty star-forming regions account for ∼6% and ∼17% of the total 1.5 and 4.4 μ m luminosity of the starburst ring, respectively. Thanks to JWST, we find a significant number of young dusty sources that were previously unseen due to dust extinction. The newly identified 28 young sources are a significant increase compared to the number of HST-detected young sources (4–5). This makes the total percentage of the young population rise from ∼15% to 48%. These results illustrate the effectiveness of JWST in identifying and characterizing previously hidden star formation in the densest star-forming environments around active galactic nuclei (AGN).
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