J/A+A/633/A163 Mrk 231 CO(1-0) and CN(1-0) line observations (Cicone+, 2020)
Enhanced UV radiation and dense clumps in the molecular outflow of Mrk 231.
Cicone C., Maiolino R., Aalto S., Muller S., Feruglio C.
<Astron. Astrophys. 633, A163 (2020)>
=2020A&A...633A.163C 2020A&A...633A.163C (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, Seyfert ; Interstellar medium ; Radio lines
Keywords: galaxies: active - galaxies: evolution -
galaxies: individual: Mrk 231 - galaxies: interactions -
submillimeter: galaxies - galaxies: ISM
Abstract:
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∼105-6cm-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∼7-20km/s, 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∼0.3-5x108M☉. 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 aected by UV radiation.
Description:
CO(1-0) and CN(1-0) line observations of Mrk 231 obtained with the IRAM
PdBI using the Widex correlator and the 6C configuration of the array.
IRAM PdBI project ID = UA26. This is the primary beam-corrected,
continuum-subtracted, cleaned datacube.
Objects:
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RA (2000) DE Designation(s)
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12 56 14.23 +56 52 25.2 Mrk 231 = MCG+10-19-004
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 120 1 Information on the datacube
fits/* . 1 Datacube
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See also:
J/ApJ/788/123 : IRTF J-band spectrum of Mrk 231 (Leighly+, 2014)
J/A+A/593/A30 : Detection of fast HI outflow in Mrk231 (Morganti+, 2016)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 31 I4 --- Nz Number of pixels along Z-axis
33- 40 F8.2 km/s bVel Lower value of velocity interval
42- 47 F6.1 km/s BVel Upper value of velocity interval
49- 55 F7.5 km/s dVel Velocity resolution
57- 62 I6 Kibyte size Size of FITS file
64- 72 A9 --- FileName Name of FITS file, in subdirectory fits
74-120 A47 --- Title Title of the FITS file
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Acknowledgements:
Claudia Cicone, claudia.cicone(at)astro.uio.no
(End) Patricia Vannier [CDS] 13-Jan-2020