A search for interstellar gas-phase CO2. Gas: Solid state abundance ratios

Academic Article


  • We present searches for gas-phase CO2 features in the ISO-SWS infrared spectra of four deeply embedded massive young stars, which all show strong solid CO2 absorption. The abundance of gas-phase CO2 is at most 2. 10-7 with respect to H2, and is less than 5% of that in the solid phase. This is in strong contrast to CO, which is a factor of 10-100 more abundant in the gas than in solid form in these objects. The gas/solid state ratios of CO2, CO and H2O are discussed in terms of the physical and chemical state of the clouds.
  • Authors

    Author List

  • Van Dishoeck EF; Helmich FP; De Graauw T; Black JH; Boogert ACA; Ehrenfreund P; Gerakines PA; Lacy JH; Millar TJ; Schutte WA
  • Volume

  • 315
  • Issue

  • 2