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dc.contributor.authorPatra, Narendra Nath-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2021, Vol.501, p3527–3539en_US
dc.identifier.issn1365-2966 (online)-
dc.descriptionOpen Access.en_US
dc.description.abstractSeveral recent studies reinforce the existence of a thick molecular disc in galaxies along with the dynamically cold thin disc. Assuming a two-component molecular disc, we model the disc of NGC 6946 as a four-component system consisting of stars, H I, thin disc molecular gas, and thick disc molecular gas in vertical hydrostatic equilibrium. Following, we set up the joint Poisson–Boltzmann equation of hydrostatic equilibrium and solve it numerically to obtain a three-dimensional density distribution of different baryonic components. Using the density solutions and the observed rotation curve, we further build a three-dimensional dynamical model of the molecular disc and consecutively produce simulated CO spectral cubes and spectral width profiles. We find that the simulated spectral width profiles distinguishably differ for different assumed thick disc molecular gas fractions. Several CO spectral width profiles are then produced for different assumed thick disc molecular gas fractions and compared with the observed one to obtain the best fit thick disc molecular gas fraction profile. We find that the thick disc molecular gas fraction in NGC 6946 largely remains constant across its molecular disc with a mean value of 0.70 ± 0.09. We also estimate the amount of extra-planar molecular gas in NGC 6946. We find ∼50 per cent∼50 per cent of the total molecular gas is extra-planar at the central region, whereas this fraction reduces to ∼15 per cent at the edge of the molecular disc. With our method, for the first time, we estimate the thick disc molecular gas fraction as a function of radius in an external galaxy with sub-kpc resolution.en_US
dc.publisherOxford University Press on behalf of the Royal Astronomical Societyen_US
dc.rights2020 The Author(s)en_US
dc.subjectmolecular dataen_US
dc.subjectISM: moleculesen_US
dc.subjectkinematics and dynamicsen_US
dc.subjectgalaxies: spiralen_US
dc.subjectgalaxies: structureen_US
dc.titleThick disc molecular gas fraction in NGCen_US
Appears in Collections:Research Papers (A&A)

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