Enhanced UV radiation and dense clumps in the molecular outflow of Mrk 231
Enhanced UV radiation and dense clumps in the molecular outflow of Mrk 231
复制标题
Mrk 231 分子流出中的紫外线辐射增强和密集团块
DOI：
10.1051/0004-6361/201936800
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发表时间：
2019
影响因子：
6.5
通讯作者：
C. Feruglio
中科院分区：
文献类型：
--
作者：
C. Cicone;R. Maiolino;S. Aalto;S. Muller;C. Feruglio
我们给出了对MRK231中CN(1-0)谱线发射的干涉观测，并结合以前对CO和其他H2气体示踪剂的观测，研究了大量分子外流的物理性质。我们发现，在MERK 231的流出中，CN/CO(1-0)线光度比有了很大的提高，这比任何其他已知的银河系或河外天文源都是前所未有的。对于由HCN和CN排放跟踪的外流中的稠密气相，我们推断XCN ≡ [CN]/[H2]>；XHCN至少是三倍，H_2气体密度为NH_2 ∼ _(105)−6 cm−_3。此外，我们还首次解决了在HCN(1-0)和HCO+(1-0)高速线翼中跟踪外流稠密相的窄光谱特征。这些光谱特征的速度频散σv ∼ 7−20 KM S−1与在附近恒星爆发核中探测到的大质量河外巨型分子云的速度频散一致。由氢化氢数据推测的氢气质量相当高， ∼ 为0.3−5 × 10 8 M⊙。我们的结果表明，更密集的分子气体的大量复合体嵌入到流出的更扩散的H2相中，并且这些流出的致密云的化学成分受到紫外线辐射的强烈影响。
We present interferometric observations of the CN(1–0) line emission in Mrk 231 and combine them with previous observations of CO and other H2 gas tracers to study the physical properties of the massive molecular outflow. We find a strong boost of the CN/CO(1–0) line luminosity ratio in the outflow of Mrk 231, which is unprecedented compared to any other known Galactic or extragalactic astronomical source. For the dense gas phase in the outflow traced by the HCN and CN emissions, we infer XCN ≡ [CN]/[H2]> XHCN by at least a factor of three, with H2 gas densities of nH2 ∼ 105−6 cm−3. In addition, we resolve for the first time narrow spectral features in the HCN(1–0) and HCO+(1–0) high-velocity line wings tracing the dense phase of the outflow. The velocity dispersions of these spectral features, σv ∼ 7−20 km s−1, are consistent with those of massive extragalactic giant molecular clouds detected in nearby starburst nuclei. The H2 gas masses inferred from the HCN data are quite high, Mmol ∼ 0.3−5 × 108 M⊙. Our results suggest that massive complexes of denser molecular gas survive embedded into the more diffuse H2 phase of the outflow, and that the chemistry of these outflowing dense clouds is strongly affected by UV radiation.
影响因子：
4.8
作者：
R. Gallagher;R. Maiolino;F. Belfiore;N. Drory;R. Riffel;R. Riffel
通讯作者：
R. Gallagher;R. Maiolino;F. Belfiore;N. Drory;R. Riffel;R. Riffel
影响因子：
4.8
作者：
T. Costa;J. Rosdahl;D. Sijacki;M. Haehnelt
通讯作者：
T. Costa;J. Rosdahl;D. Sijacki;M. Haehnelt
影响因子：
6.5
作者：
Henkel, C.;Asiri, H.;Harada, N.
通讯作者：
Harada, N.