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We present interferometric observations of CO lines (12CO(1-0, 2-1) and13CO(1-0, 2-1)) and dense gas tracers (HCN(1-0), HCO+(1-0), HNC(1-0) andHNCO(4-3)) in two nearby edge-on barred lenticular galaxies, NGC 4710 and NGC5866, with most of the gas concentrated in a nuclear disc and an inner ring ineach galaxy. We probe the physical conditions of a two-component molecularinterstellar medium in each galaxy and each kinematic component by usingmolecular line ratio diagnostics in three complementary ways. First, we measurethe ratios of the position-velocity diagrams of different lines, second wemeasure the ratios of each kinematic component's integrated line intensities asa function of projected position, and third we model these line ratios using anon-local thermodynamic equilibrium radiative transfer code. Overall, thenuclear discs appear to have a tenuous molecular gas component that is hotter,optically thinner and with a larger dense gas fraction than that in the innerrings, suggesting more dense clumps immersed in a hotter more diffuse molecularmedium. This is consistent with evidence that the physical conditions in thenuclear discs are similar to those in photo-dissociation regions. A similarpicture emerges when comparing the observed molecular line ratios with those ofother galaxy types. The physical conditions of the molecular gas in the nucleardiscs of NGC4710 and NGC5866 thus appear intermediate between those of spiralgalaxies and starbursts, while the star formation in their inner rings is evenmilder.

Molecular Gas Kinematics and Line Diagnostics in Early-type Galaxies: NGC4710 and NGC5866