Multiphase High-Velocity Gas Detected within 7 kpc Toward the M13 Globular Cluster

Details Multiphase High-Velocity Gas Detected within 7 kpc Toward the M13 Globular Cluster Multiphase High-Velocity Gas Detected within 7 kpc Toward the M13 Globular Cluster

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011pasp..123..914w&link_type=abstract

Publications of the Astronomical Society of the Pacific, Volume 123, issue 906, pp.914-922

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We present medium-resolution ultraviolet interstellar absorption measurements recorded with the HST-COS and FUSE spectrographs toward the post-AGB star Barnard 29 in the M13 globular cluster. Inspection of the UV spectra has revealed absorption at V˜-60 km s in the absorption profiles of the C I, C II, C, C IV, N I, N II, N V, O I, ALII, Si II, Si IV, S II and Fe II ions. This component can be associated with an intermediate-velocity cloud (IVC), previously identified by both radio and visible observations. More importantly, these data have newly revealed high-velocity absorption at V=-121±3 km s in the UV ions of C II, C III, C IV, N II, Si II, and Si IV. This absorption is thought to arise in a highly ionized, multiphase high-velocity cloud (HVC) located a distance of 0.46+0.40±0.21 and [C/N]=+0.10±0.25 for the HVC gas component. These values indicate that the H V gas has higher than solar relative abundances, consistent with gas of a supersolar metallicity. Several other highly ionized HVCs with distances of less than 7.5 kpc have recently been shown to possess similarly high-metallicity values that are consistent with an origin in condensing returning gas from a galactic fountain.

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