Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8150w&link_type=abstract
HST Proposal ID #8150
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Hst Proposal Id #8150 Interstellar And Intergalactic Matter
Scientific paper
From observations of S II, H I and HAlpha toward the Seyfert galaxy Mark 290, we have recently determined that the high- velocity cloud complex C has a metallicity 0.07+/-0.02 times solar. Other work shows that this extensive cloud complex is at least 3 kpc above the galactic plane and probably closer than 30 kpc, placing it in the Galactic halo. These results make it likely that complex C is a remnant of the formation of the Galaxy or Local Group. It may represent a present-day analogue of the damped LyAlpha absorbers seen in QSO spectra. Our abundance result provides the first direct observational evidence for the infall of low-metallicity gas on the Milky Way, required in models of galactic chemical evolution. We request time to obtain the near-UV spectrum of Mark 290, to measure column densities for Zn, Fe, Mn and Cr. Zn and S are produced by different nucleosynthetic pathways {S is an Alpha element, Zn an Fe peak element} and both are usually only slightly depleted onto dust; thus, the S/Zn ratio provides crucial information about the element production history of complex C. Fe, Mn and Cr are usually mostly in dust grains, so their ratios with S and Zn will tell us about the presence, amount and properties of the dust. These observations will provide important zero-redshift abundance information for the study of gas and dust in damped LyAlpha systems.
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