Cosmic Origins Spectrograph Observations of Translucent Clouds

Details Cosmic Origins Spectrograph Observations of Translucent Clouds Cosmic Origins Spectrograph Observations of Translucent Clouds

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934907b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #349.07

Astronomy and Astrophysics

Astronomy

Scientific paper

The high sensitivity of the Hubble Space Telescope's Cosmic Origins Spectrograph allows for the observation of heavily reddened OB stars unobservable by preceding ultraviolet spectrographs. We present measurements of the metal and molecular content along six sightlines sampling the translucent interstellar medium, with AV ranging from 2.7 to 7.6. We find that the sample includes both sightlines that are concatenations of multiple diffuse clouds as well as sightlines sampling true translucent material. In these latter regions we find that molecular fractions, metal depletions, CO to H2 ratios and CO rotational excitation temperatures are all enhanced. We discuss the physical and chemical properties of these sightlines in the context of previous observations of the diffuse and translucent interstellar medium.

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