Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1135...34l&link_type=abstract
FUTURE DIRECTIONS IN ULTRAVIOLET SPECTROSCOPY: A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic
Other
Cosmology, Quasars, Quasars, Active Or Peculiar Galaxies, Objects, And Systems
Scientific paper
The O VI absorber at z = 0.2028 detected in the spectrum of the QSO PKS 0312-77 is the strongest discovered so far in the low redshift Universe (logN(OVI) = 14.95+/-0.05,) and is observed near a Lyman limit system (LLS). We present an analysis of these absorbers and their connection to galaxies based on a combination of FUV and NUV spectra of PKS 0312-77 obtained from FUSE and HST/STIS E140M/E230M and optical imaging and spectroscopy of galaxies in the field. Based on O I/H I and a photoionization model, we find a metallicity of 0.25 solar for the LLS, too enriched to be pristine IGM gas. We find that the gas resulting from the merger of a 0.7L* galaxy (impact parameter of 38 kpc) is the likely origin for the LLS. At -190 km/s from the LLS, another absorber is found with a supersolar metallicity. Outflow from this galaxy is likely responsible for this supersolar, fully ionized absorber. The metallicity variation is a possible evidence for poor mixing of metals on galactic structure as observed in the Milky Way halo. The origin of the strong O VI remains more enigmatic with plausible origins including an intragroup medium or a galactic corona.
Cales S. L.
Cooksey Kathy L.
Howk Chris J.
Kobulnicky Henry A.
Lehner Nicholas
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