THE BURIED STARBURST IN THE INTERACTING GALAXY II Zw 096 AS REVEALED BY THE SPITZER SPACE TELESCOPE
THE BURIED STARBURST IN THE INTERACTING GALAXY II Zw 096 AS REVEALED BY THE SPITZER SPACE TELESCOPE
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DOI：
10.1088/0004-6256/140/1/63
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发表时间：
2010-04
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通讯作者：
H. Inami;H. Inami;H. Inami;L. Armus;J. Surace;J. Mazzarella;A. Evans;D. Sanders;J. Howell;A. Petric;T. Vavilkin;K. Iwasawa;S. Haan;E. Murphy;S. Stierwalt;P. Appleton;J. Barnes;G. Bothun;C. Bridge;B. Chan;V. Charmandaris;V. Charmandaris;D. Frayer;L. Kewley;Dongchan Kim;S. Lord;B. Madore;B. Madore;J. Marshall;H. Matsuhara;J. Melbourne;J. Rich;B. Schulz;H. Spoon;E. Sturm;S. Veilleux;K. Xu
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作者：
H. Inami;H. Inami;H. Inami;L. Armus;J. Surace;J. Mazzarella;A. Evans;D. Sanders;J. Howell;A. Petric;T. Vavilkin;K. Iwasawa;S. Haan;E. Murphy;S. Stierwalt;P. Appleton;J. Barnes;G. Bothun;C. Bridge;B. Chan;V. Charmandaris;V. Charmandaris;D. Frayer;L. Kewley;Dongchan Kim;S. Lord;B. Madore;B. Madore;J. Marshall;H. Matsuhara;J. Melbourne;J. Rich;B. Schulz;H. Spoon;E. Sturm;S. Veilleux;K. Xu
本文分析了斯皮策太空望远镜、哈勃太空望远镜、钱德拉X射线天文台和AKARI红外天文卫星对z = 0.036的合并星系系统II Zw 096（CGCG 448-020）的观测数据。由于II Zw 096的红外光度log（LIR/L返）= 11.94，因此被归类为亮红外星系（LIRG），并在大天文台全天LIRG巡天（GOALS）中被观测到。斯皮策的数据表明，总红外光度的80%来自一个非常紧凑的红色光源，与合并星系的核无关。斯皮策的中红外光谱表明，在这个源中没有来自埋藏的活动星系核的高电离线。AKARI和Spitzer光谱中3.3 μm和6.2 μm的多环芳烃发射特征的强探测也意味着II Zw 096的能源是一个星暴。根据斯皮策红外成像和AKARI近红外光谱，星星的形成速率估计分别为1.2亿年和>45亿年。最后，高分辨率的B、I和H波段图像显示了相互作用系统中的许多星星团。这些星团的颜色表明至少有两个种群，一个年龄在1-5百万年之间，另一个年龄在2 - 5亿年之间，由于0-2等的视觉灭绝而变红。这些星团的质量跨度在106到108 M之间。这个星暴源让人想起了在NGC 4038/9（银河星系）和阿普299中看到的双核星暴，但比银河星系大约亮一个数量级。这个源是显着的，因为非核红外光度主导了整个系统。
An analysis of data from the Spitzer Space Telescope, Hubble Space Telescope, Chandra X-ray Observatory, and AKARI Infrared Astronomy Satellite is presented for the z = 0.036 merging galaxy system II Zw 096 (CGCG 448-020). Because II Zw 096 has an infrared luminosity of log(LIR/L☉) = 11.94, it is classified as a Luminous Infrared Galaxy (LIRG), and was observed as part of the Great Observatories All-sky LIRG Survey (GOALS). The Spitzer data suggest that 80% of the total infrared luminosity comes from an extremely compact, red source not associated with the nuclei of the merging galaxies. The Spitzer mid-infrared spectra indicate no high-ionization lines from a buried active galactic nucleus in this source. The strong detection of the 3.3 μm and 6.2 μm polycyclic aromatic hydrocarbon emission features in the AKARI and Spitzer spectra also implies that the energy source of II Zw 096 is a starburst. Based on Spitzer infrared imaging and AKARI near-infrared spectroscopy, the star formation rate is estimated to be 120 M☉ yr-1 and >45 M☉ yr-1, respectively. Finally, the high-resolution B-, I-, and H-band images show many star clusters in the interacting system. The colors of these clusters suggest at least two populations—one with an age of 1–5 Myr and one with an age of 20–500 Myr, reddened by 0–2 mag of visual extinction. The masses of these clusters span a range between 106 and 108 M☉. This starburst source is reminiscent of the extranuclear starburst seen in NGC 4038/9 (the Antennae Galaxies) and Arp 299 but approximately an order of magnitude more luminous than the Antennae. The source is remarkable in that the off-nuclear infrared luminosity dominates the entire system.