Molecular hydrogen gas at high-velocity associated with the Monoceros Loop SNR
Experimental Astrophysics Group, Space Sciences Laboratory, UC Berkeley, Berkeley, CA 94720, USA
2 Center for Astrophysics and Space Astronomy, University of Colorado, Boulder, CO 80309, USA
Corresponding author: B. Y. Welsh, email@example.com
Accepted: 15 October 2001
We present Far Ultraviolet Spectroscopic Explorer () observations of molecular hydrogen (H2) gas observed at a high-velocity of 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 rotational level, with an equivalent molecular hydrogen column density of log cm-2. The observed data are best fit with a single excitation temperature, Tex, 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 , which is similar to that found for HV clouds in the galactic halo.
Key words: ISM: supernova remnants / ISM: molecules
© ESO, 2002