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Table 4:

Relative velocities in the 8 o'clock arc.

Spectral features
za $\upsilon$b
    (km s-1)
Stellar photospheric absorption lines $z_{\rm stars}$= 2.7347 -24
H II emission lines $z_{\rm C~\mathsc{iii}]}$= 2.7350 0
Recombination emission line $z_{{\rm Si~\mathsc{ii}}^*}$= 2.7352 +16
Interstellar absorption lines $z_{\rm ISM}$= 2.7335 -120
Ly$\alpha $ emission line $z_{\rm Ly\alpha}$= 2.7420 +570

Notes. (a) Vacuum heliocentric; (b) relative to the systemic redshift $z_{\rm sys} = 2.7350$ that is the mean of $z_{\rm stars}$ and $z_{\rm em}$ (the mean redshift of emission lines).


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