GOALS-JWST: Unveiling Dusty Compact Sources in the Merging Galaxy IIZw096

Author:

Inami HanaeORCID,Surace JasonORCID,Armus LeeORCID,Evans Aaron S.ORCID,Larson Kirsten L.ORCID,Barcos-Munoz LoretoORCID,Stierwalt SabrinaORCID,Mazzarella Joseph M.ORCID,Privon George C.ORCID,Song YiqingORCID,Linden Sean T.ORCID,Hayward Christopher C.ORCID,Böker TorstenORCID,U VivianORCID,Bohn ThomasORCID,Charmandaris VassilisORCID,Diaz-Santos TanioORCID,Howell Justin H.ORCID,Lai ThomasORCID,Medling Anne M.ORCID,Rich Jeffrey A.ORCID,Aalto SusanneORCID,Appleton PhilipORCID,Brown Michael J. I.ORCID,Hoshioka Shunshi,Iwasawa KazushiORCID,Kemper FranciscaORCID,Law DavidORCID,Malkan Matthew A.ORCID,Marshall JasonORCID,Murphy Eric J.ORCID,Sanders DavidORCID,Werf Paul van derORCID

Abstract

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 × 1011 L , arises from a source no larger than 175 pc in radius, suggesting a luminosity density of at least 3–5 × 1012 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.

Funder

MEXT ∣ Japan Society for the Promotion of Science

National Science Foundation

NASA Astrophysics Data Analysis Program

ERC Advanced Grant

MCIN

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

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