Molecular hydrogen gas at high-velocity associated with the Monoceros Loop SNR

Details Molecular hydrogen gas at high-velocity associated with the Monoceros Loop SNR Molecular hydrogen gas at high-velocity associated with the Monoceros Loop SNR

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...381..566w&link_type=abstract

Astronomy and Astrophysics, v.381, p.566-570 (2002)

Astronomy and Astrophysics

Astrophysics

6

Ism: Supernova Remnants, Ism: Molecules

Scientific paper

We present Far Ultraviolet Spectroscopic Explorer (FUSE) observations of molecular hydrogen (H2) gas observed at a high-velocity of V_LSR = +66 km s-1 towards the star HD 47240 which lies just behind the Monoceros Loop Supernova Remnant at a distance of ~ 1800 pc. These absorption features have been detected in six lines of the J = 3 rotational level, with an equivalent molecular hydrogen column density of log N(H2) = 14.10, +/- 0.12 cm-2. The observed data are best fit with a single excitation temperature, T_ex, of ~ 1000 K, which when comparised to temperatures generally found for low J-levels is unusually high for interstellar H2. The molecular fraction in this HV cloud has a very low value of log f = -4.5+/-0.25, which is similar to that found for HV clouds in the galactic halo.

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