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• W3105441637 endingPage "114" @default.
• W3105441637 startingPage "114" @default.
• W3105441637 abstract "We present the first observations of H$^{13}$CN$(1-0)$, H$^{13}$CO$^+(1-0)$ and SiO$(2-1)$ in NGC,6240, obtained with the IRAM PdBI. Combining a Markov Chain Monte Carlo (MCMC) code with Large Velocity Gradient (LVG) modelling, and with additional data from the literature, we simultaneously fit three gas phases and six molecular species to constrain the physical condition of the molecular gas, including mass$-$luminosity conversion factors. We find $sim10^{10}M_odot$ of dense molecular gas in cold, dense clouds ($T_{rm k}sim10$,K, $n_{{rm H}_2}sim10^6$,cm$^{-3}$) with a volume filling factor $<0.002$, embedded in a shock heated molecular medium ($T_{rm k}sim2000$,K, $n_{{rm H}_2}sim10^{3.6}$,cm$^{-3}$), both surrounded by an extended diffuse phase ($T_{rm k}sim200$,K, $n_{{rm H}_2}sim10^{2.5}$,cm$^{-3}$). We derive a global $alpha_{rm CO}=1.5^{7.1}_{1.1}$ with gas masses $log_{10}left(M / [M_odot]right)=10.1_{10.0}^{10.8}$, dominated by the dense gas. We also find $alpha_{rm HCN} = 32^{89}_{13}$, which traces the cold, dense gas. The [$^{12}$C]/[$^{13}$C] ratio is only slightly elevated ($98^{230}_{65}$), contrary to the very high [CO]/[$^{13}$CO] ratio (300-500) reported in the literature. However, we find very high [HCN]/[H$^{13}$CN] and [HCO$^+$]/[H$^{13}$CO$^+$] abundance ratios $(300^{500}_{200})$ which we attribute to isotope fractionation in the cold, dense clouds." @default.
• W3105441637 created "2020-11-23" @default.
• W3105441637 creator A5001552464 @default.
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• W3105441637 creator A5078590942 @default.
• W3105441637 creator A5078844333 @default.
• W3105441637 creator A5087379508 @default.
• W3105441637 date "2015-12-15" @default.
• W3105441637 modified "2023-09-25" @default.
• W3105441637 title "MODELING THE MOLECULAR GAS IN NGC 6240" @default.
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