Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20717501l&link_type=abstract
American Astronomical Society Meeting 207, #175.01; Bulletin of the American Astronomical Society, Vol. 37, p.1444
Astronomy and Astrophysics
Astronomy
Scientific paper
We report the first detection of Lyα pumped molecular hydrogen emission in planetary nebulae, based on FUSE observations of NGC 6853 (905--1187 Å) and HUT observations of NGC 3132 (820--1840 Å). The atypical H2 emission observed in the spectra of NGC 6853 and NGC 3132 can be explained by excitation of vibrationally hot H2 by Lyα photons. In both cases, the detected H2 lines require a temperature in the 2000 K range and a ˜ 0.33 Å wide Lyα with a deep self-reversal. These parameters satisfy both short and long wavelength constraints, pointing to similar conditions of the gas in the two nebulae. The H2 and \ion{H}{1} column densities as well as the Doppler shifts of the molecular and atomic components with respect to the nebular Lyα are estimated in each case.
FUSE data were obtained under the Guest Investigator Program (NASA grant NNGO4GK82G) by the NASA-CNES-CSA FUSE mission, operated by the Johns Hopkins University.
France Kevin
Lupu Roxana E.
McCandliss Stephan R.
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