Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..698r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Feb. 15, 1990, p. 698-703. Research supported by S
Astronomy and Astrophysics
Astronomy
34
Absorption Spectra, Abundance, Heavy Elements, Lyman Alpha Radiation, Quasars, Galactic Evolution, Line Spectra, Photoionization
Scientific paper
High resolution observations of regions chosen to cover C II, C IV, O I, and Si II lines of the damped Ly-alpha absorption system at 2.07625 in the line-of-sight toward the quasar 2206 - 199N are used to obtain estimates of the abundances of these elements. The observations show that there is a single velocity component with a Doppler parameter b = sq rt 2sigma = 11 km/s for the neutral and singly ionized species with a larger values of about 119 km/s for C IV. The heavy element abundances are very low compared with those of the sun, which the C/Si and O/Si ratios are close to the solar values. It is suggested that, in the probable absence of significant dust depletion, the z = 2.07625 system may be an example of absorption by gas in a chemically young galaxy.
Carswell Robert F.
Rauch Marco
Robertson Gordon J.
Shaver Peter A.
Webb John K.
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