Intervening nuclear obscuration changing the X-ray look of the z ≈ 6 quasi-stellar object CFHQS J164121+375520

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Volume 694 (February 2025)

A&A, 694 (2025) L16

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Table 1.

Available X-ray observations of J1641 and net counts and fluxes in the soft (SB), hard (HB), and full (FB) bands.

Epoch	ObsID	Start	T_exp	Net counts			Flux [10⁻¹⁵ erg cm⁻² s⁻¹]

		Date	[ks]	SB	HB	FB	SB	HB	FB
2018	20 396 + 21 961	2018-11-15	54.3	$39 . 5_{- 6.0}^{+ 6.6}$ $39.5_{-6.0}^{+6.6}$	$8 . 3_{- 2.7}^{+ 3.4}$ $8.3_{-2.7}^{+3.4}$	$47 . 8_{- 6.7}^{+ 7.3}$ $47.8_{-6.7}^{+7.3}$	$6 . 4_{- 1.0}^{+ 1.1}$ $6.4_{-1.0}^{+1.1}$	$2 . 8_{- 0.9}^{+ 1.2}$ $2.8_{-0.9}^{+1.2}$	$10 . 6_{- 1.5}^{+ 1.6}$ $10.6_{-1.5}^{+1.6}$
2021 (EPIC-PN only)	0862560101	2021-02-02	53.9	< 17.5	< 14.4	< 23.0	< 0.8	< 1.7	< 1.4

2022	25 529	2022-05-15	24.4	< 2.3	$3 . 7_{- 1.7}^{+ 2.4}$ $3.7_{-1.7}^{+2.4}$	$3 . 5_{- 1.7}^{+ 2.4}$ $3.5_{-1.7}^{+2.4}$	< 0.3	$2 . 9_{- 1.4}^{+ 1.9}$ $2.9_{-1.4}^{+1.9}$	$2 . 6_{- 1.3}^{+ 1.8}$ $2.6_{-1.3}^{+1.8}$
2023	25 530	2023-03-07	26.7	< 5.2	< 2.3	< 5.0	< 1.4	< 1.9	< 3.6
2024	25 531 + 30 473	2024-09-30	30.6	< 2.3	< 5.1	< 5.0	< 0.6	< 4.0	< 3.7

2022 + 2023 + 2024			81.7	< 4.9	$5 . 2_{- 2.2}^{+ 2.8}$ $5.2_{-2.2}^{+2.8}$	$6 . 7_{- 2.5}^{+ 3.2}$ $6.7_{-2.5}^{+3.2}$	< 0.4	$1 . 2_{- 0.5}^{+ 0.6}$ $1.2_{-0.5}^{+0.6}$	$1 . 3_{- 0.5}^{+ 0.6}$ $1.3_{-0.5}^{+0.6}$

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