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

Inami, Hanae and Surace, Jason and Armus, Lee and Evans, Aaron S. and Larson, Kirsten L. and Barcos-Munoz, Loreto and Stierwalt, Sabrina and Mazzarella, Joseph M. and Privon, George C. and Song, Yiqing and Linden, Sean T. and Hayward, Christopher C. and Böker, Torsten and U, Vivian and Bohn, Thomas and Charmandaris, Vassilis and Diaz-Santos, Tanio and Howell, Justin H. and Lai, Thomas and Medling, Anne M. and Rich, Jeffrey A. and Aalto, Susanne and Appleton, Philip and Brown, Michael J. I. and Hoshioka, Shunshi and Iwasawa, Kazushi and Kemper, Francisca and Law, David and Malkan, Matthew A. and Marshall, Jason and Murphy, Eric J. and Sanders, David and van der Werf, Paul (2022) GOALS-JWST: Unveiling Dusty Compact Sources in the Merging Galaxy IIZw096. Astrophysical Journal Letters, 940 (1). Art. No. L6. ISSN 2041-8205. doi:10.3847/2041-8213/ac9389.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Inami, Hanae0000-0003-4268-0393
Surace, Jason0000-0001-7291-0087
Armus, Lee0000-0003-3498-2973
Evans, Aaron S.0000-0003-2638-1334
Larson, Kirsten L.0000-0003-3917-6460
Barcos-Munoz, Loreto0000-0003-0057-8892
Stierwalt, Sabrina0000-0002-2596-8531
Mazzarella, Joseph M.0000-0002-8204-8619
Privon, George C.0000-0003-3474-1125
Song, Yiqing0000-0002-3139-3041
Linden, Sean T.0000-0002-1000-6081
Hayward, Christopher C.0000-0003-4073-3236
Böker, Torsten0000-0002-5666-7782
U, Vivian0000-0002-1912-0024
Bohn, Thomas0000-0002-4375-254X
Charmandaris, Vassilis0000-0002-2688-1956
Diaz-Santos, Tanio0000-0003-0699-6083
Howell, Justin H.0000-0001-6028-8059
Lai, Thomas0000-0001-8490-6632
Medling, Anne M.0000-0001-7421-2944
Rich, Jeffrey A.0000-0002-5807-5078
Aalto, Susanne0000-0002-5828-7660
Appleton, Philip0000-0002-7607-8766
Brown, Michael J. I.0000-0002-1207-9137
Iwasawa, Kazushi0000-0002-4923-3281
Kemper, Francisca0000-0003-2743-8240
Law, David0000-0002-9402-186X
Malkan, Matthew A.0000-0001-6919-1237
Marshall, Jason0000-0001-7712-8465
Murphy, Eric J.0000-0001-7089-7325
Sanders, David0000-0002-1233-9998
van der Werf, Paul0000-0001-5434-5942
Additional Information:The authors would like to thank the referee whose constructive comments helped improve the manuscript. The JWST data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST) at the Space Telescope Science Institute. The specific observations analysed can be accessed via STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS526555. Support to MAST for these data is provided by the NASA Office of Space Science via grant NAG57584 and by other grants and contracts. This work is based on observations made with the NASA/ESA/CSA James Webb Space Telescope. These observations are associated with program 1328. The data were obtained from the Mikulski Archive for Space Telescopes at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127 for JWST. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is funded by the National Aeronautics and Space Administration and operated by the California Institute of Technology. H.I. and T.B. acknowledge support from JSPS KAKENHI grant No. JP21H01129 and the Ito Foundation for Promotion of Science. Y.S. is supported by the NSF through grant AST 1816838 and the Grote Reber Fellowship Program administered by the Associated Universities, Inc./ National Radio Astronomy Observatory. The Flatiron Institute is supported by the Simons Foundation. Vivian U acknowledges funding support from NASA Astrophysics Data Analysis Program (ADAP) grant 80NSSC20K0450. A.M.M. acknowledges support from the National Science Foundation under grant No. 2009416. S.A. gratefully acknowledges support from an ERC Advanced grant 789410, from the Swedish Research Council and from the Knut and Alice Wallenberg (KAW) foundation. K.I. acknowledges support by the Spanish MCIN under grant PID2019-105510GB-C33/AEI.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
NASANAS 5-26555
NASANAS 5-03127
Japan Society for the Promotion of Science (JSPS)JP21H01129
Ito Foundation for Promotion of ScienceUNSPECIFIED
National Radio Astronomy ObservatoryUNSPECIFIED
Simons FoundationUNSPECIFIED
European Research Council (ERC)789410
Swedish Research CouncilUNSPECIFIED
Knut and Alice Wallenberg FoundationUNSPECIFIED
Ministerio de Ciencia e Innovación (MCIN)PID2019-105510GB-C33/AEI/10.13039/501100011033
Issue or Number:1
Record Number:CaltechAUTHORS:20230110-58978000.6
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118762
Deposited By: Research Services Depository
Deposited On:09 Feb 2023 17:40
Last Modified:09 Feb 2023 17:40

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