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- W2000661760 abstract "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. 40 refs." @default.
- W2000661760 created "2016-06-24" @default.
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- W2000661760 date "1991-02-01" @default.
- W2000661760 modified "2023-09-26" @default.
- W2000661760 title "A study of two absorption-line complexes in the quasar UM 402 = Q0207 - 003" @default.
- W2000661760 doi "https://doi.org/10.1086/169668" @default.
- W2000661760 hasPublicationYear "1991" @default.
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