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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >A molecular line survey toward the nearby galaxies NGC1068, NGC253, and IC 342 at 3mm with the Nobeyama 45 m radio telescope: Impact of an AGN on 1 kpc scale molecular abundances
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A molecular line survey toward the nearby galaxies NGC1068, NGC253, and IC 342 at 3mm with the Nobeyama 45 m radio telescope: Impact of an AGN on 1 kpc scale molecular abundances

机译：与Noboyama 45 M射频望远镜3mm的附近星系NGC1068，NGC253和IC 342的分子线调查：AGN对1 KPC规模分子丰富的影响

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摘要

It is important to investigate the relationships between the power sources and the chemical compositions of galaxies in order to understand the scenario of galaxy evolution. We carried out an unbiased molecular line survey towards active galactic nucleus (AGN) host galaxy NGC1068, and prototypical starburst galaxies, NGC253 and IC342, with the Nobeyama 45 m telescope in the 3 mm band. The advantage of this line survey is that the obtained spectra have the highest angular resolution ever obtained with single-dish telescopes. In particular, the beam size of this telescope is similar to 15 ''-19 '', which is able to separate spatially the nuclear molecular emission from that of the starburst ring (d similar to 30 '') in NGC1068. We successfully detected approximately 23 molecular species in each galaxy, and calculated rotation temperatures and column densities. We estimate the molecular fractional abundances with respect to (CO)-C-13 and CS molecules and compare them among three galaxies in order to investigate the chemical signatures of an AGN environment. As a result, we found clear trends in the abundances of molecules surrounding the AGN on a 1-kpc scale. HCN, (HCN)-C-13, CN, (CN)-C-13, and HC3N are more abundant, and CH3CCH is deficient in NGC1068 compared with the starburst galaxies. High abundances of HCN, (HCN)-C-13, and HC3N suggest that the circumnuclear disk in NGC1068 is in a high-temperature environment. The reason for the non-detection of CH3CCH is likely to be dissociation by high-energy radiation or less sublimation of a precursor of CH3CCH from grains.
机译：为了理解星系演化的情景，研究星系的能量来源和化学成分之间的关系是很重要的。我们使用位于3mm波段的Nobeyama 45M望远镜，对活动星系核（AGN）宿主星系NGC1068和原型星暴星系NGC253和IC342进行了无偏分子线测量。这种测线的优点是，获得的光谱具有单碟望远镜所获得的最高角度分辨率。特别是，该望远镜的光束大小类似于15'-19''，能够在空间上将核分子发射与NGC1068中的星暴环（d类似于30''）的发射分离。我们成功地在每个星系中检测到了大约23种分子物种，并计算了旋转温度和柱密度。为了研究活动星系核环境的化学特征，我们估算了（CO）-C-13和CS分子的分子分数丰度，并在三个星系之间进行了比较。因此，我们发现活动星系核周围的分子丰度在1-kpc尺度上有明显的趋势。与星暴星系相比，HCN、（HCN）-C-13、CN、（CN）-C-13和HC3N更为丰富，而CH3CCH在NGC1068中缺乏。高丰度的HCN，（HCN）-C-13和HC3N表明NGC1068中的环核盘处于高温环境中。未检测到CH3CCH的原因可能是高能辐射导致的离解或CH3CCH前体从谷物中升华程度较低。

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