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Inami, Hanae; Surace, Jason; Armus, Lee; Evans, Aaron S.; Larson, Kirsten L.; Barcos-Munoz, Loreto; Stierwalt, Sabrina; Mazzarella, Joseph M.; Privon, George C.; Song, Yiqing; Linden, Sean T.; Hayward, Christopher C.; Böker, Torsten; U, Vivian; Bohn, Thomas; Charmandaris, Vassilis; Diaz-Santos, Tanio; Howell, Justin H.; Lai, Thomas; Medling, Anne M.; Rich, Jeffrey A.; Aalto, Susanne; Appleton, Philip; Brown, Michael J. I.; Hoshioka, Shunshi; Iwasawa, Kazushi; Kemper, Francisca; Law, David; Malkan, Matthew A.; Marshall, Jason; Murphy, Eric J.; Sanders, David; Werf, Paul van der
Astrophysical journal. Letters, 11/2022, Letnik: 940, Številka: 1Journal Article
Abstract We have used the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST) to obtain the first spatially resolved, mid-infrared images of IIZw096 , a merging luminous infrared galaxy (LIRG) at z = 0.036. Previous observations with the Spitzer Space Telescope suggested that the vast majority of the total IR luminosity ( L IR ) of the system originated from a small region outside of the two merging nuclei. New observations with JWST/MIRI now allow an accurate measurement of the location and luminosity density of the source that is responsible for the bulk of the IR emission. We estimate that 40%–70% of the IR bolometric luminosity, or 3–5 × 10 11 L ⊙ , arises from a source no larger than 175 pc in radius, suggesting a luminosity density of at least 3–5 × 10 12 L ⊙ kpc −2 . In addition, we detect 11 other star-forming sources, five of which were previously unknown. The MIRI F1500W/F560W colors of most of these sources, including the source responsible for the bulk of the far-IR emission, are much redder than the nuclei of local LIRGs. These observations reveal the power of JWST to disentangle the complex regions at the hearts of merging, dusty galaxies.
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in: SICRIS
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