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

EF vanDishoeck*, FP Helmich, T de Graauw, JH Black, ACA Boogert, P Ehrenfreund, PA Gerakines, JH Lacy, TJ Millar, WA Schutte, AGGM Tielens, DCB Whittet, DR Boxhoorn, DJM Kester, K Leech, PR Roelfsema, A Salama, B Vandenbussche

*Corresponding author for this work

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Abstract

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 H-2, 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.

Original languageEnglish
Pages (from-to)L349-L352
Number of pages4
JournalAstronomy & astrophysics
Volume315
Issue number2
Publication statusPublished - Nov-1996

Keywords

  • ISM, abundances
  • ISM, molecules
  • ISM, individual, AFGL 2591, AFGL 4176, AFGL 2136, NGC 7538 IRS9
  • CARBON-DIOXIDE
  • SPECTROSCOPY
  • MOLECULES
  • GL-2591
  • HOCO+
  • BANDS

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