Radio properties of the OH megamaser galaxy IIZw 096
Radio properties of the OH megamaser galaxy IIZw 096
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DOI：
10.1051/0004-6361/202142854
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Prabhakar Misra
中科院分区：
文献类型：
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作者：
Hong Wu;Zhongzu Wu;Yu. Sotnikova;Yongjun Chen;Bo Zhang;T. Mufakharov;Zhiqiang Shen;Xi Chen;A. Mikhailov;M. Mingaliev;Xianming L. Han;Prabhakar Misra
Based on the two epochs European Very Long Baseline Interferometry (VLBI) Network (EVN) archive data from OH line observations of IIZw 096, we confirm that the high-resolution OH emission in this source mainly comes from two spots (OH1 and OH2) of comp D1 of this merging system. We found no significant variations in the OH 1667 MHz line emission, including flux densities and peak positions. The OH 1665 MHz line emission is detected at about 6 σ level in the OH1 region by combining two epoch EVN observations. By using archival data from the Very Long Baseline Array (VLBA), Very Large Array (VLA), and Atacama Large Millimeter Array (ALMA) observations, we investigated the properties of the environment of this component through H I, CO (3-2), and HCO+ (4-3) lines and the multi-band radio continuum emission. We found that the comp D1 shows the brightest CO, HCO+ line emission, as well as multi-band radio continuum emission. The environment around D1 shows no clear velocity structure associated with circular motions, making it different from most other OH megamasers (OHMs) in the literature, which might have been caused by an effect during the merger stage. Meanwhile, we found that the CO emission shows three velocity structures around D1, including the central broad FWHM region, the double peak region where the CO line profile shows two separated peaks, and the region of the high-velocity clouds where the CO line peaks at a high velocity (∼ 11000 km s−1). Similarly, H I observations in absorption also show high-velocity clouds around the D1 region, which might be due to inflows caused by the merging of two or more galaxy components. Based on the high-resolution K-band VLA and L-band VLBA observations of the radio continuum emission, we derived the brightness temperature in the range 10 K to 10 K, which is consistent with other starburst dominant OHM sources in the literature. The multi-band VLA observations show that the radio continuum emission of comp D might also have contributions from free-free emission, besides synchrotron emission. As a concenquence, these results support a starburst origin for the OHMs, without the presence of an AGN.
