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- W2016752068 abstract "New high-resolution high signal-to-noise spectra of the $z=1.15$ damped Lyman $alpha$ (DLA) system toward the quasi-stellar object HE 0515-4414 reveal absorption lines of the multiplets 2 and 3 in ion{C}{i}. The resonance lines are seen in two components with total column densities of $log N=13.79pm0.01$ and $log N=13.36pm0.01$, respectively. The comparision of theoretical calculations of the relative fine-structure population with the ratios of the observed column densities suggests that the ion{C}{i} absorbing medium is either very dense or exposed to very intense UV radiation. The upper limit on the local UV energy density is 100 times the galactic UV energy density, while the upper limit on the ion{H}{i} number density is 110 cm$^{-3}$. The excitation temperatures of the ground state fine-structure levels of $T=15.7$ and $T=11.1$ K, respectively, are consistent with the temperature-redshift relation predicted by the standard Friedmann cosmology. The cosmic microwave background radiation (CMBR) is only a minor source of the observed fine-structure excitation." @default.
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- W2016752068 title "Fine-structure diagnostics of neutral carbon toward HE 0515-4414" @default.
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- W2016752068 doi "https://doi.org/10.1051/0004-6361:20020342" @default.
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