The G1 Intermediate-velocity Cloud:low-metallicity Gas Streaming Away From The Galaxy

Details The G1 Intermediate-velocity Cloud:low-metallicity Gas Streaming Away From The Galaxy The G1 Intermediate-velocity Cloud:low-metallicity Gas Streaming Away From The Galaxy

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934901w&link_type=abstract

American Astronomical Society, AAS Meeting #219, #349.01

Astronomy and Astrophysics

Astronomy

Scientific paper

We present medium resolution (R 15 km/s) ultraviolet absorption measurements recorded with the HST-Cosmic Origins Spectrograph towards two post-AGB stars located within the M15 globular cluster. By sampling interstellar gas over the 10.4kpc sight-line we have revealed spectral absorption features associated with the foreground g1 Intermediate Vleocity Cloud (IVC), whose distance lies between 1.8 - 3.8 kpc.
The UV line-profiles reveal IVC absorption at a velocity of V(lsr) +61.5 km/s, in both low and high ionization ions. The derived column density ratios of [OI/H] = -1.22+/-0.44 and [NI/H] = -1.21+/-0.38 suggest an appreciable sub-solar metallicity for the out-streaming gas. The more highly ionized gas possesses higher than solar abundance ratios relative to that of O. A possible origin for this IVC is that of a low metallicity cloud that has been accreted towards our galaxy, has passed through the disk and is now moving away from the galactic plane.

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