The Infall of Low Metallicity Gas onto the Galactic Disk

Details The Infall of Low Metallicity Gas onto the Galactic Disk The Infall of Low Metallicity Gas onto the Galactic Disk

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.7209g&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #72.09; Bulletin of the American Astronomical Society, Vol. 31, p.1476

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present an HST GHRS+STIS abundance analysis of the High-Velocity Cloud (HVC) Complex C, seen in absorption toward five background QSOs. The S 2 metallicity along the Mrk 290 sightline (0.09 Zsun), line-of-sight velocity (-120 km s-1), and inferred thermal pressure have motivated the suggestion that Complex C represents a prototypical example of the postulated source of infalling low metallicity gas that in turn fuels the bulk of star formation in the Milky Way. We discuss how our mapping of the abundance distribution, via the use of what is now five background probes spread across the face of the HVC, affects this picture of Galactic evolution. New multi-episodic HVC infall models governing the formation of the halo and thick+thin disks will be presented.

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