Discovery of Galactic O iv and O v X-ray absorption due to transition temperature gas in the PKS 2155-304 spectrum

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Volume 605 (September 2017)

A&A, 605 (2017) A47

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Table 3

Ion column densities.

Ion	log N(cm^-2) ^a
	RGS1	RGS2	HRC	ACIS

Ne ix	–	15.96	16.59	≤15.37
O vii^b	16.24	15.93	15.86	16.07
O viii	16.03	15.71	15.92	15.70
O v	15.17	–	15.28	≤14.40
O iv	15.61	–	15.68	≤15.38
O iv (CIE)	15.56	–	15.51	–
O i	–	–	16.54	16.19
N vi	15.05	14.84	15.23	≤14.87
N i	–	–	15.81	≤15.56
C vi	15.34	15.41	14.97	≤15.22

Notes.

^(a)

The values are obtained by fitting the data with the slab model, i.e. without an assumption about the ionisation balance, except for O iv, for which we also show the value obtained under CIE assumption. The uncertainties include the systematic uncertainty of 1 mÅ and the allowance of v_tot = 20–35 km s^-1.

^(b)

The value for RGS1, RGS2, and HRC is the weighted mean of the Lyα and Lyβ measurements. RGS2 only covers the Lyβ line.

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