The outflowing ionised gas of I Zw 1 observed by HST COS

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Volume 686 (June 2024)

A&A, 686 (2024) A99

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Table 2.

Column densities of ions detected in the I Zw 1 COS spectrum.

Ion	log N_ion [cm⁻²]
	A	B	C	D
H I	13.5 ± 0.1 ^(a)	13.9 $_{- 0.2}^{+ 0.1}$ $_{-0.2}^{+0.1}$ ^(a)	12.8 ± 0.1 ^(a)	12.8 ± 0.1 ^(a)
C IV	$14 . 2_{- 1.1}^{+ 0.3}$ $14.2_{-1.1}^{+0.3}$	15.2 ± 0.2	$13 . 0_{- 0.3}^{+ 0.1}$ $13.0_{-0.3}^{+0.1}$	$12 . 5_{- 0.9}^{+ 0.2}$ $12.5_{-0.9}^{+0.2}$
N V	13.7 $_{- 0.5}^{+ 0.3}$ $_{-0.5}^{+0.3}$ ^(b)	15.2 ± 0.2	13.4 ± 0.3	13.3 ± 0.3
Si II	< 12.8	⋯	< 11.8	< 12.3
Si IV	$12 . 2_{- 0.5}^{+ 0.4}$ $12.2_{-0.5}^{+0.4}$	$13 . 4_{- 0.2}^{+ 0.3}$ $13.4_{-0.2}^{+0.3}$	$11 . 7_{- 1.0}^{+ 0.4}$ $11.7_{-1.0}^{+0.4}$	< 11.6
P V	< 12.8	$12 . 8_{- 0.4}^{+ 0.2}$ $12.8_{-0.4}^{+0.2}$	< 12.5	< 13.2
O VI	⋯	⋯	⋯	$15 . 2_{- 0.6}^{+ 0.4}$ $15.2_{-0.6}^{+0.4}$

Notes.

^(a)

Treated as a lower limit due to saturation.

^(b)

Treated as a lower limit due to the exclusion of the blended part of the absorption trough.

Components A, B, C, and D denote the kinematic absorption systems at −2900, −1950, −280, and −60 km s⁻¹, respectively. 3σ limits are given. The ionic column densities are given after correcting for partial covering, namely C_f = 0.45 and 0.44 for components A and B, respectively. C and D are given assuming full source coverage. O VI column density is derived from an archival FUSE spectrum (see the text for more details).

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