Measuring Gas Phase Abundances in the Extreme Outer Regions of Disk Galaxies

Details Measuring Gas Phase Abundances in the Extreme Outer Regions of Disk Galaxies Measuring Gas Phase Abundances in the Extreme Outer Regions of Disk Galaxies

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..286w&link_type=abstract

NOAO Proposal ID #1999A-0286

Physics

Scientific paper

We propose to measure the present-day chemical abundances of oxygen and nitrogen in the extreme outer regions of several nearby disk galaxies, by obtaining emission-line spectra of newly-discovered, faint outer disk HII regions. Our sample of HII regions lie at galactocentric radii of 1-2.5 times the classical optical radius, R_25 (defined by the 25th B-band isophote) and thus provide a probe of the physical conditions in these poorly explored regions of spiral disks. The mean abundance and dispersion in these parts, as well as the behaviour of the abundance gradient, provide important constraints on competing models for spiral galaxy evolution, and further, serve as a point of contact with gaseous galactic disk models for damped Ly(alpha) absorption systems seen towards some high redshift QSOs. The observations requested here will allow us to observe a sufficient number of HII regions to accurately determine radial abundance gradients and dispersions.

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