Mathematics – Logic
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19712304c&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #123.04; Bulletin of the American Astronomical Society, Vol. 32, p.1608
Mathematics
Logic
Scientific paper
I present a study of the galaxies that give rise to Lyman-α (Lyα ) and triply ionized carbon (C IV) absorption lines observed in the spectra of background quasi-stellar objects. By comparing the redshifts of galaxies and Lyα absorption systems along common lines of sight, I confirmed the existence of an anti-correlation between Lyα absorption equivalent width and galaxy impact parameter. Further analysis showed that the extent of tenuous gas scales with galaxy B-band and K-band luminosities. I found that extended gaseous halos are a common and generic feature of galaxies over a wide range of luminosity and morphological type and Lyα absorption systems traced a significant and representative portion of the galaxy population. By comparing the redshifts of galaxies and C IV absorption systems along common lines of sight, I also found that extended gaseous halos of galaxies have been enriched by metals out to large galactocentric radii, ≈ 100\ h-1 kpc. The covering factor of ionized gas in galactic halos was estimated to nearly unity.
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