Dense Gas and Star Formation in Nearby Infrared-bright Galaxies: APEX Survey of HCN and HCO+ J = 2 → 1

Both Galactic and extragalactic studies of star formation suggest that stars form directly from dense molecular gas. To trace such high volume density gas, HCN and HCO + J = 1 → 0 have been widely used for their high dipole moments, relatively high abundances, and often being the strongest lines aft...

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