Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.0501j&link_type=abstract
American Astronomical Society, AAS Meeting #212, #5.01; Bulletin of the American Astronomical Society, Vol. 40, p.194
Astronomy and Astrophysics
Astronomy
Scientific paper
We have previously presented preliminary results, based on data from the Far Ultraviolet Spectroscopic Explorer, of the column densities and velocity structure of rotationally excited (J=2 and greater) molecular hydrogen in several translucent lines of sight. Our two most interesting results were the scarcity of detections of H2 in states of J=6 and greater and little-to-no evidence of any variation in the velocity structure of H2 in different rotationally excited states, a situation which may be conceivable under certain conditions and has been previously suggested. We now present our completed analysis of a sample of 20+ lines of sight, primarily lines of sight from the FUSE Translucent Cloud Survey, and comment further on our previous results. In addition, we present our interpretation of these lines of sight, using simple but physically justified cloud models input into radiative transfer codes. While few if any of these lines of sight a dominated by a single, true "translucent cloud", understanding the physical conditions in these lines of sight is an important step toward understanding translucent clouds, which will be examined in more detail with the Cosmic Origins Spectrograph.
Jensen Adam G.
Snow Theodore P.
Sonneborn George
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