GOALS-JWST: Unveiling Dusty Compact Sources in the Merging Galaxy IIZw096
GOALS-JWST: Unveiling Dusty Compact Sources in the Merging Galaxy IIZw096
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DOI：
10.3847/2041-8213/ac9389
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发表时间：
2022-08
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通讯作者：
H. Inami;J. Surace;L. Armus;A. Evans;K. Larson;L. Barcos-Muñoz;S. Stierwalt;J. Mazzarella;G. Privon;Yiqing Song;S. Linden;C. Hayward;T. Böker;V. U;T. Bøhn;V. Charmandaris;T. Díaz-Santos;J. Howell;T. Lai;A. Medling;J. Rich;S. Aalto;P. Appleton;Michael J. I. Brown;Shunshi Hoshioka;K. Iwasawa;F. Kemper;D. Law;M. Malkan;J. Marshall;E. Murphy;D. Sanders;P. Werf
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作者：
H. Inami;J. Surace;L. Armus;A. Evans;K. Larson;L. Barcos-Muñoz;S. Stierwalt;J. Mazzarella;G. Privon;Yiqing Song;S. Linden;C. Hayward;T. Böker;V. U;T. Bøhn;V. Charmandaris;T. Díaz-Santos;J. Howell;T. Lai;A. Medling;J. Rich;S. Aalto;P. Appleton;Michael J. I. Brown;Shunshi Hoshioka;K. Iwasawa;F. Kemper;D. Law;M. Malkan;J. Marshall;E. Murphy;D. Sanders;P. Werf
我们使用詹姆斯·韦伯太空望远镜（JWST）上的中红外仪器（MIRI）获得了第一批空间分辨的中红外图像IIZw 096，一个z = 0.036的合并亮红外星系（LIRG）。斯皮策太空望远镜先前的观测表明，该系统的绝大多数总红外光度（L IR）来自两个合并核之外的一个小区域。JWST/MIRI的新观测现在可以精确测量源的位置和光度密度，这是大部分红外发射的原因。我们估计40%~ 70%的红外辐射热光度，或3-5 × 1011 L，来自半径不大于175 pc的光源，这意味着至少有3-5 × 1012 L kpc−2的光度密度。此外，我们还发现了另外11个恒星形成源，其中5个是以前未知的。大多数这些光源的MIRI F1500 W/F560 W颜色，包括负责大部分远红外发射的光源，比本地LIRG的核要红得多。这些观测结果揭示了JWST在解开合并中尘埃星系中心复杂区域的力量。
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.