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- W2774801811 abstract "Minor mergers are important processes contributing significantly to how galaxies evolve across age of Universe. Their impact on supermassive black hole growth and star formation is profound. detailed study of dense molecular gas in galaxies provides an important test of validity of relation between star formation rate and HCN luminosity on different galactic scales. We use observations of HCN, HCO+1-0 and CO3-2 to study dense gas properties in Medusa merger. We calculate brightness temperature ratios and use them in conjunction with a non-LTE radiative line transfer model. HCN and HCO+1-0, and CO3-2 emission do not occupy same structures as less dense gas associated with lower-J CO emission. only emission from dense gas is detected in a 200pc region within of Medusa. No HCN or HCO+ is detected for extended starburst. CO3-2/2-1 brightness temperature ratio inside the Eye is ~2.5 - highest ratio found so far. line ratios reveal an extreme, fragmented molecular cloud population inside the Eye with large temperatures (>300K) and high gas densities (>10^4 cm^-3). The Eye is found at an interface between a large-scale minor axis inflow and Medusa central region. extreme conditions inside the Eye may be result of radiative and mechanical feedback from a deeply embedded, young, massive super star cluster, formed due to gas pile-up at intersection. Alternatively, shocks from inflowing gas may be strong enough to shock and fragment gas. For both scenarios, however, it appears that HCN and HCO+ dense gas tracers are not probing star formation, but instead a post-starburst and/or shocked ISM that is too hot and fragmented to form new stars. Thus, caution is advised in linking detection of emission from dense gas tracers to evidence of ongoing or imminent star formation." @default.
- W2774801811 created "2017-12-22" @default.
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- W2774801811 date "2017-12-11" @default.
- W2774801811 modified "2023-10-05" @default.
- W2774801811 title "Major impact from a minor merger - The extraordinary hot molecular gas flow in the Eye of the NGC 4194 Medusa galaxy" @default.
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