The Metallicity of High-Velocity Cloud Complex C

Details The Metallicity of High-Velocity Cloud Complex C The Metallicity of High-Velocity Cloud Complex C

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6590w&link_type=abstract

HST Proposal ID #6590

Computer Science

Hst Proposal Id #6590 Interstellar Medium

Scientific paper

Our requested observation will be used to determine theintrinsic heavy element abundance of the largest high-velocitycloud (HVC), complex C. This measurement can only be done withHST, as the required spectral lines are inaccesible by ground-based observations, while IUE was not sensitive enough.Knowing the metallicity of HVCs is essential fordiscriminating between different theories for their origin.Suggestions vary from a galactic fountain andsuperbubbles/supernova-remnants to a polar ring around ourgalaxy. Using GHRS, we will observe the interstellar S IIabsorption associated with complex C, in the spectrum of theextra-galactic background object Mark 290. Sulphur occursmostly in the gas phase and is thus representative of theintrinsic metal abundance. We will be able to measure aSulphur abundance in complex C as low as 0.07 solar (for a3Sigma detection). Using the replacement for GHRS, STIS, wouldnot improve our program, as all the interesting S II linesfall within a 10 Angstrom wavelength range, while thesensitivity is expected to be comparable.

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