Time-dependent excitation and ionization modelling of absorption-line variability due to GRB 080310

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Volume 549 (January 2013)

A&A, 549 (2013) A22

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Table 5

Maximum Fe iii column density reached as a function of the assumed H i column and iron abundance in the GRB 080310 absorber.

log N(H i)	Fixed	[Fe/H] = −1.0^b	[Fe/H] = +0.2^b^,^c

18.6	13.55	11.83	13.02
19.6	13.24	12.52	13.71
20.6	12.69	12.95	14.14
21.6	12.05	13.20	14.37

Notes.

^(a)

In this column, the Fe ii and Fe iii column densities were fixed at the best-fit values of Table 3, i.e. for higher H i column densities, the iron abundance effectively decreases with respect to the log N(H i) = 18.6 case.

^(b)

For these runs at fixed iron abundance, we assumed that [Fe/H] = [Fe ii/H i] before the onset of the GRB, i.e. all the iron ions are in the singly ionized state and all the hydrogen is neutral, which is only a good approximation at higher H i column densities.

^(c)

The iron abundance for GRB 080310 was determined to be [Fe/H] = +0.2 when including ionization corrections (see Paper I).

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