Enhanced UV radiation and dense clumps in the molecular outflow of Mrk 231
Artikel i vetenskaplig tidskrift, 2020

We present interferometric observations of the CN(1-0) line emission in Mrk 231 and combine them with previous observations of CO and other H-2 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 X-CN equivalent to [CN]/[H-2]> X-HCN by at least a factor of three, with H-2 gas densities of n(H2) similar to 10(5-6)& x2006;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, sigma(v) similar to 7-20 km s(-1), are consistent with those of massive extragalactic giant molecular clouds detected in nearby starburst nuclei. The H-2 gas masses inferred from the HCN data are quite high, M-mol similar to 0.3-5 x 10(8) M-circle dot. Our results suggest that massive complexes of denser molecular gas survive embedded into the more diffuse H-2 phase of the outflow, and that the chemistry of these outflowing dense clouds is strongly affected by UV radiation.

galaxies: active

galaxies: interactions

galaxies: individual: Mrk 231

galaxies: evolution

submillimeter: galaxies

galaxies: ISM


Claudia Cicone

Istituto nazionale di astrofisica (INAF)

Universitetet i Oslo

Roberto Maiolino

University of Cambridge

Susanne Aalto

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Sebastien Muller

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

Chiara Feruglio

Istituto nazionale di astrofisica (INAF)

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 633 A163


Astronomi, astrofysik och kosmologi



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