Soft X-ray absorption excess in gamma-ray burst afterglow spectra: Absorption by turbulent ISM

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Table 1

Column densities of highly ionised gas C iv, N v, O vi measured in GRB afterglow spectra (Fox et al. 2008; Prochaska et al. 2008) and along the lines of sight through our turbulent ISM data cubes (Avg., Max).

GRB	z	N_CIV	N_NV	N_OVI	N_SiIV	Ref.

Avg. (1 cm^-3)	...	13.40	12.82	13.68	12.65	this work
Max. (1 cm^-3)	...	14.37	13.59	14.19	13.86	this work
Avg. (3 cm^-3)	...	13.45	13.03	13.91	12.70	this work
Max. (3 cm^-3)	...	14.32	14.34	14.44	13.64	this work
GRB 021004	2.32	...	14.53 ± 0.06	14.95 ± 0.20	15.25 ± 0.20	1
		...	14.64 ± 0.04	...	...	2
GRB 050730	3.97	~15.24	13.80 ± 0.14	~15.94	14.16 ± 0.06	1
		...	14.09 ± 0.08	...	...	2
GRB 050820	2.62	13.13 ± 0.06	13.17 ± 0.08	...	14.91 ± 0.07	1
		...	13.45 ± 0.05	...	...	2
GRB 050922C	2.2	15.69 ± 0.35	13.76 ± 0.07	14.44 ± 0.05	14.49 ± 0.16	1
		...	>14.19	...	...	2
GRB 060206	4.05	...	13.73 ± 0.15	...	...	2
GRB 060607	3.08	15.94 ± 0.32	...	...	13.54 ± 0.09	1
		...	<12.61	...	...	2
GRB 071031	2.69	~15.11	14.41 ± 0.15	~15.14	15.93 ± 0.51	1
GRB 080310	2.42	~16.66	14.03 ± 0.05	15.12 ± 0.09	~15.00	1

Notes. Only the measured absorption from low velocity components (few 100 km s^-1) are given. The column densities for the ions from Fox et al. (2008) without error bars correspond to saturated lines and are uncertain.

Reference. (1) Fox et al. (2008); (2) Prochaska et al. (2008).

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