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While emission-selected galaxy surveys are biased towards the most luminouspart of the galaxy population, absorption selection is a potentially unbiasedgalaxy selection technique with respect to luminosity. However, the physicalproperties of absorption-selected galaxies are not well characterised. Here westudy the excitation conditions in the interstellar medium (ISM) in dampedLy$\alpha$ (DLA) absorption-selected galaxies. We present a study of the COspectral line energy distribution (SLED) in four high-metallicityabsorption-selected galaxies with previously reported CO detections atintermediate ($z \sim 0.7$) and high ($z \sim 2$) redshifts. We find furtherevidence for a wide variety of ISM conditions in these galaxies. Two out of thefour galaxies show CO SLEDs consistent with that of the Milky Way inner disk.Interestingly, one of these galaxies is at $z \sim 2$ and has a CO SLED belowthat of main-sequence galaxies at similar redshifts. The other two galaxies at$z>2$ show more excited ISM conditions, with one of them showing thermalexcitation of the mid-$J$ (J$=3, 4$) levels, similar to that seen in twomassive main-sequence galaxies at these redshifts. Overall, we find thatabsorption selection traces a diverse population of galaxies.

CO Excitation and Line Energy Distributions in Gas-selected Galaxies