H II Region Abundances in Polar-Ring Galaxies

Details H II Region Abundances in Polar-Ring Galaxies H II Region Abundances in Polar-Ring Galaxies

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..154e&link_type=abstract

NOAO Proposal ID #1999A-0154

Physics

Scientific paper

We propose to obtain long-slit spectra of H II regions in the rings of the polar-ring galaxies II Zw 73 and UGC 7576 in order to measure their oxygen abundances. Observations of H II regions in the polar rings of NGC 2685 and A0136-0801 both reveal oxygen abundances in the range 0.8-1.1 Solar. Traditional scenarios for polar ring formation involve the accretion of low-abundance material; a dwarf galaxy, the outer part of a spiral galaxy, or an intergalactic H I cloud. As polar- ring galaxies are too faint to have captured entire massive spiral disks, and as there are no easily accretable sources of metal-rich gas in the current Universe, our results for NGC 2685 and A0136-0801 instead argue that polar rings must be stable over long time-scales, in agreement with some dynamical models. It also argues that they must be self-gravitating, in order to have retained and thus been enriched by ejecta from successive bursts of star formation. The target galaxies in this study are kinematically confirmed polar-ring galaxies visible in the upcoming semester in the northern hemisphere with ring H II regions identified in our deep H(alpha) imaging study.

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