Probing the galactic disk and halo: Metal abundances in the Magellanic Stream

Details Probing the galactic disk and halo: Metal abundances in the Magellanic Stream Probing the galactic disk and halo: Metal abundances in the Magellanic Stream

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...437l.119l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 437, no. 2, p. L119-L122

Astronomy and Astrophysics

Astrophysics

35

Abundance, Galactic Halos, Intergalactic Media, Magellanic Clouds, Metallicity, Milky Way Galaxy, Seyfert Galaxies, Absorption Spectroscopy, Hubble Space Telescope, Ultraviolet Absorption

Scientific paper

We derive metal abundance limits for two clouds in the Magellanic Stream using Goddard High Resolution Spectrograph (GHRS) medium resolution spectra of the Seyfert galaxy Fairall 9. We find Si/H is greater than or equal to 0.2 solar and S/H is less than or equal to 0.9 solar for the +170 km/s cloud with a N(H I) = 2 x 1019/sq cm and Si/H is greater than or equal to 0.07 solar and S/H is less than or equal to 0.3 solar for the +210 km/s cloud with a N(H I) = 6 x 1019/sq cm. These abundance limits rule out the Magellanic Stream as primordial gas. The metal abundance limits are consistent with the Magellanic Cloud abundances. If the two Magellanic Stream clouds have the same metal abundances, then Si/H is greater than or equal to 0.2 solar and S/H is less than or equal to 0.3 solar for the gas. The ratio Si/S is then greater than or equal to 0.6 of the solar ratio, suggesting that dust depletion is probably not very significant in the Magellanic Stream.

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