Chandra LETGS observation of the variable NLS1 galaxy Ark 564

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Volume 551 (March 2013)

A&A, 551 (2013) A95

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Table 3

Parameters of the narrow absorption lines from Gaussian fits.

^aλ_obs (Å)	^bλ₀ (Å)	Atomic transition	^cEW (mÅ)	^dv (km s^-1)

	15.02	Fe xvii 2p⁶−2p⁵3d
	18.63	O vii 1s²−1s3p	32 ± 8
	18.97	O viii 1s−2p	<26
	22.05	O vi 1s²2s−1s2s2p	<24
	22.35^h	O v 1s²2s²−1s2s²2p	<25
23.52^e	23.53	^gO i	<52	− 150^f
	23.35	^gO ii		^f
	28.47	C vi 1s−3p	<35
	33.74	C vi 1s−2p	<31

Notes. Errors are 90% confidence intervals.

^(a)

Wavelength of the line in the observer frame.

^(b)

Theoretical wavelength of the line in rest frame.

^(c)

Equivalent width of the line in mÅ.

^(d)

Velocity of the ion in the frame of the quasar.

^(e)

Line center fixed at this value.

^(f)

These are velocities computed at z = 0 to represent absorption in the frame of our Galaxy.

^(g)

Galatic oxygen absorption.

^(h)

Theoretical value taken from Pradhan et al. (2003).

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