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arXiv 1102.3915astro-ph.GA
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NGC 1068环核盘中的稠密分子气体

The Dense Molecular Gas in the Circumnuclear Disk of NGC 1068

J. Kamenetzky, J. Glenn, P. R. Maloney, J. E. Aguirre, J. J. Bock, C. M. Bradford, L. Earle, H. Inami, H. Matsuhara, E. J. Murphy, B. J. Naylor, H. T. Nguyen, J. Zmuidzinas

摘要:

我们提出了一个190-307 GHz的宽带光谱获得的Z-规格的NGC 1068与新的测量分子转动跃迁。结合我们的测量与以前发表的,并考虑到这个塞弗特2星系的具体几何形状,我们进行了多物种贝叶斯似然分析的密度,温度和相对分子丰度的HCN,HNC,CS,和HCO+。我们发现,这些分子跟踪的是H2数密度为10^4.2 - 10^4.9 cm^-3的暖气体(T > 100 K)。我们的模型还对这些分子的柱密度和相对丰度以及环核盘中的总质量进行了严格的限制。使用宽Z-Spec带通提供的统一校准,我们比较我们的线比X射线占主导地位的区域(XDR)和光子占主导地位的区域模型。我们的大部分线的比例是一致的XDR模型的密度表示的可能性分析,贷款实质性的支持新兴的解释,在NGC 1068的环核盘的能量主要由吸积到一个活动星系核。

英文摘要:

We present a 190-307 GHz broadband spectrum obtained with Z-Spec of NGC 1068 with new measurements of molecular rotational transitions. After combining our measurements with those previously published and considering the specific geometry of this Seyfert 2 galaxy, we conduct a multi-species Bayesian likelihood analysis of the density, temperature, and relative molecular abundances of HCN, HNC, CS, and HCO+. We find that these molecules trace warm (T > 100 K) gas of H2 number densities 10^4.2 - 10^4.9 cm^-3. Our models also place strong constraints on the column densities and relative abundances of these molecules, as well as on the total mass in the circumnuclear disk. Using the uniform calibration afforded by the broad Z-Spec bandpass, we compare our line ratios to X-ray dominated region (XDR) and photon-dominated region models. The majority of our line ratios are consistent with the XDR models at the densities indicated by the likelihood analysis, lending substantial support to the emerging interpretation that the energetics in the circumnuclear disk of NGC 1068 are dominated by accretion onto an active galactic nucleus.

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