To be or not to be: the case of the hot WHIM absorption in the blazar PKS 2155–304 sight line

J. Nevalainen; E. Tempel; J. Ahoranta; L. J. Liivamägi; M. Bonamente; E. Tilton; J. Kaastra; T. Fang; P. Heinämäki; E. Saar; A. Finoguenov

doi:10.1051/0004-6361/201833109

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Volume 621 (January 2019)

A&A, 621 (2019) A88

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Table 3.

O VIII Lyα measurements at z ∼ 0.054 − 0.056 in the PKS 2155–304 sight line.


Ref.	RGS1		LETG/HRC		LETG/ACIS-S


	Exp. time	EW^a	Exp. time	EW^a	Exp. time	z	EW^a	Signif.^b
	(ks)	(mÅ)	(ks)	(mÅ)	(ks)		(mÅ)
F02	–	–	–	–	80	0.056 ± 0.001	14.0	4.5σ
C04	110	≤7	–	–	–	–	–	–
F07	–	–	200	≤5	280	0.054 ± 0.001	7.4	5.0σ
W07	–	–	230	≤6	250	0.056 ± 0.001	7.5 ± 2.1	3.5σ
This work	1200	≤1.3	310	≤2.1	330	0.0554 ± 0.0004	6.2 ± 1.7	3.2σ

Notes.

^(a)

The equivalent width is reported at 1σ confidence level.

^(b)

The significance of the detection.

References. F02: Fang et al. (2002). C04: Cagnoni et al. (2004). F07: Fang et al. (2007). W07: Williams et al. (2007). This work: the final sample.

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