Other
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...368...40w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 10, 1991, p. 40-53.
Other
14
Absorption Spectra, Metallicity, Quasars, Abundance, Astronomical Models, Gas Ionization, Intergalactic Media, Telescopes
Scientific paper
Two metal absorption-line complexes in the z = 2.856 quasar UM 402 are analyzed. The resulting data show that both systems have low turbulent velocities. In one, a low ionization complex of lines near z = 2.523, there are at least 10 separate clouds with a velocity spread of 180 km/s and a cluster of weaker lines grouped near Ly-alpha. The b-values required to model individual clouds range from less than four to 10 km/s. The excitation temperature of the C II fine structure lines are between 12.8 and 20.4 K. The abundance ratios of C, N, O, Al, Si, S, and Fe relative to H are near their corresponding solar values. A second important system has z = 2.88, a velocity of about 1900 km/s higher than the emission-line redshift. Four narrow absorption lines have individual separations within a few km/s of the splitting of the C IV doublet. A third system, with a slightly higher velocity dispersion, lies 37 km/s to the red of the median velocity of the other two clouds.
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