Chiral and molecular recognition of monosaccharides by photoexcited tryptophan in cold gas-phase noncovalent complexes as a model for chemical evolution in interstellar molecular clouds

2018 ◽  
Vol 410 (24) ◽  
pp. 6279-6287 ◽  
Author(s):  
Akimasa Fujihara ◽  
Yusuke Okawa
Keyword(s):  
Molecular Recognition ◽  
Gas Phase ◽  
Chemical Evolution ◽  
Molecular Clouds ◽  
Noncovalent Complexes ◽  
Interstellar Molecular Clouds ◽  
Cold Gas

scholarly journals Molecular depletions in cloud cores

1997 ◽  
Vol 178 ◽  
pp. 183-192 ◽  
Author(s):  
Lee G. Mundy ◽  
Joseph P. McMullin
Keyword(s):  
Gas Phase ◽  
Chemical Evolution ◽  
Quantitative Study ◽  
Molecular Clouds ◽  
Stellar Systems ◽  
Gas Phase Molecules ◽  
Cloud Cores

The condensation of gas-phase molecules onto grain surfaces in cold molecular clouds is widely expected, and the presence of the resultant icy mantles well established, but quantitative study of the gas-phase depletions has not proved easy. This paper reviews the methods for determining depletions and the associated problems. Further observations are critical to testing our expectations for depletions and for the chemical evolution of forming stellar systems.

Chemical evolution in local interstellar molecular clouds

2008 ◽  
pp. 64-67
Author(s):  
T. J. Millar ◽  
D. A. Williams ◽  
A. P. Jones ◽  
A. Freeman
Keyword(s):  
Chemical Evolution ◽  
Molecular Clouds ◽  
Interstellar Molecular Clouds

scholarly journals Enhanced UV radiation and dense clumps in the molecular outflow of Mrk 231

2020 ◽  
Vol 633 ◽  
pp. A163 ◽  
Author(s):  
Claudia Cicone ◽  
Roberto Maiolino ◽  
Susanne Aalto ◽  
Sebastien Muller ◽  
Chiara Feruglio
Keyword(s):  
Gas Phase ◽  
Uv Radiation ◽  
Molecular Clouds ◽  
Line Emission ◽  
Molecular Gas ◽  
Spectral Features ◽  
Giant Molecular Clouds ◽  
Dense Phase ◽  
Molecular Outflow ◽  
First Time

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.

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