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We used the Plateau De Bure Interferometer to observe multiple CO and neutralcarbon transitions in a z=2.2 main sequence disk galaxy, BX610. Our observationof CO(7-6), CO(4-3), and both far-infrared(FIR) [CI] lines complements previousobservations of H$\alpha$ and low-J CO, and reveals a galaxy that is vigorouslyforming stars with UV fields (Log($G$ G$_0^{-1}) \lesssim3.25);$ although lessvigorously than local ultra-luminous infrared galaxies or most starburstingsubmillimeter galaxies in the early universe. Our observations allow newindependent estimates of the cold gas mass which indicate$M_\textrm{gas}\sim2\times10^{11}$M$_\odot$, and suggest a modestly larger$\alpha_{\textrm{CO}}$ value of $\sim$8.2. The corresponding gas depletiontimescale is $\sim$1.5 Gyr. In addition to gas of modest density (Log($n$cm$^3)\lesssim3$ ) heated by star formation, BX610 shows evidence for asignificant second gas component responsible for the strong high-J CO emission.This second component might either be a high-density molecular gas componentheated by star formation in a typical photodissociation region, or could bemolecular gas excited by low-velocity C shocks. The CO(7-6)-to-FIR luminosityratio we observe is significantly higher than typical star-forming galaxies andsuggests that CO(7-6) is not a reliable star-formation tracer in this galaxy.

Neutral carbon and highly excited CO in a massive star-forming main sequence galaxy at z=2.2