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Using the Green Bank Telescope (GBT), we have detected the (J,K) = (1,1) to(10,10) ammonia inversion lines, up to 1030 K above the ground state, in aface-on spiral galaxy viewed against the radio continuum of the lensedbackground source PKS 1830-211. The ammonia absorption lines, seen at redshift0.886, appear to be optically thin with absolute peak flux densities up to 2.5percent of the total continuum of the background source. Measured intensitiesare consistent with a kinetic temperature of 80 K for 80-90 percent of theammonia column. The remaining gas is warmer, reaching at least 600 K. Columndensity and fractional abundance are of order (5-10) x 10^14 cm^-2 and(1.5-3.0) x 10^-8. Similarities with a hot ammonia absorption componentobserved toward the Sgr B2 region close to the Galactic center may suggest thatthe Sgr B2 component also originates from warm diffuse low-density moleculargas. The warm ammonia column observed toward PKS 1830-211 is unique in thesense that it originates in a spiral arm.

The kinetic temperature of a molecular cloud at redshift 0.9: Ammonia in the gravitational lens PKS1830-211