NOBEYAMA MILLIMETER INTERFEROMETRIC HCN(1–0) AND HCO+(1–0) OBSERVATIONS OF FURTHER LUMINOUS INFRARED GALAXIES
NOBEYAMA MILLIMETER INTERFEROMETRIC HCN(1–0) AND HCO+(1–0) OBSERVATIONS OF FURTHER LUMINOUS INFRARED GALAXIES
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DOI：
10.1088/0004-6256/137/3/3581
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发表时间：
2009-01
期刊：
影响因子：
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通讯作者：
M. Imanishi;K. Nakanishi;Yoichi Tamura;Chih-Han Peng
中科院分区：
文献类型：
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作者：
M. Imanishi;K. Nakanishi;Yoichi Tamura;Chih-Han Peng
我们报告了四个发光红外星系（LIRG）（NGC 2623、Mrk 266、Arp 193 和 NGC 1377）的干涉 HCN(1–0) 和 HCO+(1–0) 观测结果，作为我们使用野边毫米阵列进行系统巡天的最终样本。我们的调查包含了最系统的干涉、空间分辨、同步 HCN(1–0) 和 HCO+(1–0) LIRG 观测。还提供了这些 LIRG 的地面红外光谱，以阐明原子核能源的性质。我们推导了这些 LIRG 的 HCN(1–0)/HCO+(1–0) 亮度温度比，并证实了先前发现的趋势，即红外光谱中具有发光埋藏活动星系核 (AGN) 特征的 LIRG 核往往表现出高 HCN(1–0)/HCO+(1–0) 亮度温度比，如 AGN 中所示，而红外光谱中星暴分类的 LIRG 核显示出较小的比率，如在以星暴为主的星系中观察到。我们的新结果进一步支持了这样的论点：HCN(1–0)/HCO+(1–0) 亮度温度比可用于在观测上分离 AGN 重要的星系核和星暴主导的星系核。
We report the results of interferometric HCN(1–0) and HCO+(1–0) observations of four luminous infrared galaxies (LIRGs), NGC 2623, Mrk 266, Arp 193, and NGC 1377, as a final sample of our systematic survey using the Nobeyama Millimeter Array. Our survey contains the most systematic interferometric, spatially resolved, simultaneous HCN(1–0) and HCO+(1–0) observations of LIRGs. Ground-based infrared spectra of these LIRGs are also presented to elucidate the nature of the energy sources at the nuclei. We derive the HCN(1–0)/HCO+(1–0) brightness–temperature ratios of these LIRGs and confirm the previously discovered trend that LIRG nuclei with luminous buried active galactic nucleus (AGN) signatures in infrared spectra tend to show high HCN(1–0)/HCO+(1–0) brightness–temperature ratios, as seen in AGNs, while starburst-classified LIRG nuclei in infrared spectra display small ratios, as observed in starburst-dominated galaxies. Our new results further support the argument that the HCN(1–0)/HCO+(1–0) brightness–temperature ratio can be used to observationally separate AGN-important and starburst-dominant galaxy nuclei.