Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725120s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #251.20; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
Cosmic Origins Spectrograph Observations of a Dense Translucent Cloud
Theodore P. Snow
Eric B. Burgh
Joshua P. Destree
The Cosmic Origins Spectrograph (COS) has greater sensitivity at moderate resolution than any UV spectrograph before 2009. One of the COS programs is to obtain UV spectra of interstellar translucent clouds. In these clouds H2 is expected to dominate over H I and carbon should be making the transition from C II to C I to CO. Now we have obtained spectra of NGC 2024 No. 1, the most reddened star in our program. This sightline conforms to the definition of an extreme translucent cloud, with H2 far dominating over H I by two orders of magnitude while CO contains most of the carbon. This would be classified as dark cloud but for the fact that UV radiation passes through it - with difficulty. We present column densities of H I, H2 (inferred from the good correlation with CH), and CO. We have also obtained COS spectra of a few other stars, notably Cyg OB 8A and HD 204287, and we compare them with NCG 2024 No. 1. Forthcoming observations will establish abundances of other neutral atoms, ionized species, and simple molecules.
Burgh Eric B.
Destree J. P.
Snow Theodore P.
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