VIBRATIONALLY EXCITED HCN IN THE LUMINOUS INFRARED GALAXY NGC 4418
VIBRATIONALLY EXCITED HCN IN THE LUMINOUS INFRARED GALAXY NGC 4418
复制标题
发光红外星系 NGC 4418 中振动激发的 HCN
DOI：
10.1088/2041-8205/725/2/l228
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
D. Wilner
中科院分区：
文献类型：
--
作者：
K. Sakamoto;S. Aalto;A. Evans;M. Wiedner;D. Wilner
当利用HCN的旋转谱线探测星系核中的致密分子气体时，红外泵浦及其对HCN分子激发的影响是重要的。我们报告的第一个河外探测（亚）毫米旋转线的振动激发HCN，在尘埃笼罩的明亮的红外星系NGC 4418的核。我们估计Tvib的激发温度为230 K之间的振动基态和激发态（v2 = 1）。这种激发最有可能是由于红外辐射。在这样高的振动温度下，通过v2 = 1态的路径必然对振动基态中的转动激发有很强的影响，尽管它可能不是对所有转动能级都占主导地位。我们还观察到CO，HCN，HCO+，H13 CN，H15 N，CS，N2 H+和HC 3 N在λ <$1 mm处的近混淆极限谱线，它们的相对强度也可能受到红外泵浦的影响。
Infrared pumping and its effect on the excitation of HCN molecules can be important when using rotational lines of HCN to probe dense molecular gas in galaxy nuclei. We report the first extragalactic detection of (sub)millimeter rotational lines of vibrationally excited HCN, in the dust-enshrouded nucleus of the luminous infrared galaxy NGC 4418. We estimate the excitation temperature of Tvib ≈ 230 K between the vibrational ground and excited (v2 = 1) states. This excitation is most likely due to infrared radiation. At this high vibrational temperature the path through the v2 = 1 state must have a strong impact on the rotational excitation in the vibrational ground level, although it may not be dominant for all rotational levels. Our observations also revealed nearly confusion-limited lines of CO, HCN, HCO+, H13CN, HC15N, CS, N2H+, and HC3N at λ ∼ 1 mm. Their relative intensities may also be affected by the infrared pumping.
HCN、HNC、DCN 和 DNC 的电子轰击旋转和超精细激发
DOI：
10.1111/j.1365-2966.2007.12416.x
发表时间：
2007
影响因子：
4.8
作者：
Faure A
通讯作者：
Faure A