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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：重要的是要调查电源与星系的化学成分之间的关​​系，以了解星系进化的情况。我们对活跃的半乳清（AGN）主机星系NGC1068进行了一个无偏见的分子线调查，以及原型爆炸星系，NGC253和IC342，在3 mm带中的Noboyama 45 m望远镜。该线路调查的优点在于所获得的光谱具有有史以来的具有单碟望远镜的角度分辨率最高的角度分辨率。特别地，该望远镜的光束尺寸类似于15''-19''，其能够在NGC1068中从恒星环（D类似于30''）的空间上的核分子排放。我们在每个星系中成功地检测到大约23种分子种，并计算旋转温度和柱密度。我们估计关于（CO）-C-13和CS分子的分子分数丰度，并将它们与三个星系中的比较，以研究AGN环境的化学特征。因此，我们发现在1 kPc规模上围绕着AGN的分子丰富的明显趋势。 HCN，（HCN）-C-13，CN，（CN）-C-13和HC3N更丰富，与爆震星系相比，NGC1068的CH3CCH缺乏。 HCN（HCN）-C-13和HC3N高丰度建议NGC1068中的环形核磁盘在高温环境中。非检测CH3CCH的原因可能是通过高能辐射或从谷物中的CH3CCH前体的升华来解剖。

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