CO and H2 in the Diffuse Interstellar Medium

Details CO and H2 in the Diffuse Interstellar Medium CO and H2 in the Diffuse Interstellar Medium

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.4711b&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #47.11; Bulletin of the American Astronomical Society, Vol. 34, p.1179

Astronomy and Astrophysics

Astronomy

Scientific paper

We are investigating the molecular content of the diffuse interstellar medium along sightlines to stars that have been observed by the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope and the Far-Ultraviolet Spectroscopic Explorer. A sample of stars was chosen from archival data originally observed as part of several snapshot surveys. Both CO and H2 have extensive absorption bands in the ultraviolet, the measurement of which allows for a direct comparison of the molecular abundances along a given line-of-sight. The data presented here cover the diffuse ISM, i.e. AV < ~ 1, with 0.07 < ~ EB-V < ~ 0.5. A preliminary analysis has been performed on a number of stars. Absorption line-shape models were used to fit the CO J'' = 0 and 1 and H2 0 <= J''<= 4 rotational features. Correlations of CO with H2 as well as CO/H2 with EB-V and environment are investigated.

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