论文标题
λ= 2 mm光谱观测到朝向NGC 1068的环核盘
λ = 2 mm spectroscopy observations toward the circumnuclear disk of NGC 1068
论文作者
论文摘要
目标。我们研究了NGC1068。方法的过环盘（CND）区域中分子气体的物理和化学条件。我们对IRAM 30m望远镜进行了光谱线调查，朝NGC 1068的中心进行，主要集中在2 mM带上，频率覆盖率为160.7-168.6 GHz和176.5-184.3 GHz。结果。在NGC 1068中检测到了15条线，其中八种是该银河系的新检测。我们得出了十四个分子物种的旋转温度和柱密度。结论。基于[HCO+（2-1）]]/[HOC+（2-1）]比率，我们获得了NGC 1068的CND高电离学度。发现HC3N集中在东结中，而13cch，Ch3cn，Ch3cn，So，hoc+，hoc+，cs，cs，ch3cch和h2co cospen in sest knke ins ins ins ins ins in s n snkne in s n of ins in s n snkne n ins in s n snk in n of ins in n of ins in n of ins in n of ins in n of ins in n of ins in n of ins in n of in n of in n in n in n of。与恒星形成的星系M 82和NGC 253相比，NGC 1068的化学因素可能受到紫外线辐射场的强烈影响，其动力学温度可能较低。
Aims. We investigate the physical and chemical conditions of molecular gas in the circumnuclear disk (CND) region of NGC 1068. Methods. We carried out a spectral line survey with the IRAM 30m telescope toward the center of NGC 1068 and mainly focused on the 2 mm band with a frequency coverage of 160.7-168.6 GHz and 176.5-184.3 GHz. Results. Fifteen lines are detected in NGC 1068, eight of which are new detections for this galaxy. We derive the rotation temperatures and column densities of fourteen molecular species. Conclusions. Based on the [HCO+ (2 - 1)]/[HOC+ (2 - 1)] ratio, we obtain a high ionization degree in the CND of NGC 1068. It is found that HC3N is concentrated in the east knot, while 13CCH, CH3CN, SO, HOC+, CS, CH3CCH, and H2CO are concentrated in the west knot. Compared to the star-forming galaxies M 82 and NGC 253, the chemistry of NGC 1068 might be less strongly affected by the UV radiation field, and its kinetic temperature might be lower.
