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GOALS-JWST: NIRCam and MIRI Imaging of the Circumnuclear Starburst Ring in NGC 7469
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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 Av ∼ 7 and a contribution of at least 25% from hot dust emission to the 4.4 μm 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 μm 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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BOHN, T., INAMI, H., DIAZ-SANTOS, T., ARMUS, L., LINDEN, S.t., VIVIAN, U., SURACE, J., LARSON, K.l., EVANS, A.s., HOSHIOKA, S., LAI, T., SONG, Y., MAZZARELLA, J.m., BARCOS-MUNOZ, L., CHARMANDARIS, V., HOWELL, J.h., MEDLING, A.m., PRIVON, G.c., RICH, J.a., STIERWALT, S., AALTO, S., BÖKER, T., BROWN, M.j.i., IWASAWA, Kazushi, MALKAN, M.a., VAN DER WERF, P.p., APPLETON, P., HAYWARD, C.c., KEMPER, F., LAW, D., MARSHALL, J., MURPHY, E.j., SANDERS, D.. GOALS-JWST: NIRCam and MIRI Imaging of the Circumnuclear Starburst Ring in NGC 7469. _Astrophysical Journal Letters_. 2023. Vol. 942, núm. L36. [consulta: 20 de gener de 2026]. ISSN: 2041-8205. [Disponible a: https://hdl.handle.net/2445/218393]