Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21544817o&link_type=abstract
American Astronomical Society, AAS Meeting #215, #448.17; Bulletin of the American Astronomical Society, Vol. 42, p.457
Astronomy and Astrophysics
Astronomy
Scientific paper
We have analyzed VIMS spectra of Enceladus for the presence of ammonia, NH3. We used a correlation detection method to search for the main NH3 band near 2.9 μm, producing a subset of data with a feature near 2.9 μm. Since this band is near a VIMS filter overlap and the saturated H2O 3 μm band, we also manually searched the data for absorptions near 1.9 and 2.2 μm. The appearance of bands near 2 μm was well correlated with the band near 2.9 μm and an unidentified band near 3.5 μm. The strength of these bands was compared to laboratory measurements of NH3 diluted in H2O. The NH3 band was found predominantly on the south pole where the strongest absorptions were found near, but not on, the tiger stripes. NH3 decomposes quickly under radiation, so these presence of NH3 indicates a young surface, possibly a fresh plume deposit.
Mastrapa Rachel M.
Ou-Yang Benjamin
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