Characteristics of the high-frequency humps in the black hole X-ray binary Swift J1727.8–1613

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Volume 707 (March 2026)

A&A, 707 (2026) A33

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Table 1.

Log of the seven data groups selected for our timing analysis.

Exposure ID	Time	2–10 keV Rate	10–23 keV Rate	23–100 keV Rate	Hardness	Type-C QPO frequency
	(MJD)	(counts s⁻¹)	(counts s⁻¹)	(counts s⁻¹)		(Hz)
00113 – 00205	60182.95 – 60183.61	$3810_{- 200}^{+ 130}$ $Mathematical equation: $ 3810^{+130}_{-200} $$	1280 ± 50	$3980_{- 70}^{+ 40}$ $Mathematical equation: $ 3980^{+40}_{-70} $$	1.933_−0.012^+0.011	$0 . 50_{- 0.04}^{+ 0.03}$ $Mathematical equation: $ 0.50^{+0.03}_{-0.04} $$

00209 – 00212	60184.14 – 60184.54	$4330_{- 90}^{+ 100}$ $Mathematical equation: $ 4330^{+100}_{-90} $$	$1300_{- 40}^{+ 20}$ $Mathematical equation: $ 1300^{+20}_{-40} $$	$3800_{- 60}^{+ 140}$ $Mathematical equation: $ 3800^{+140}_{-60} $$	1.853_−0.013^+0.006	$0 . 700_{- 0.018}^{+ 0.011}$ $Mathematical equation: $ 0.700^{+0.011}_{-0.018} $$

00301 – 00303	60185.31 – 60185.59	$4420_{- 60}^{+ 30}$ $Mathematical equation: $ 4420^{+30}_{-60} $$	$1297_{- 15}^{+ 13}$ $Mathematical equation: $ 1297^{+13}_{-15} $$	$3660_{- 60}^{+ 50}$ $Mathematical equation: $ 3660^{+50}_{-60} $$	1.783_−0.008^+0.013	$0 . 86_{- 0.05}^{+ 0.03}$ $Mathematical equation: $ 0.86^{+0.03}_{-0.05} $$

00306 – 00311	60185.99 – 60186.65	4510 ± 40	$1212_{- 12}^{+ 27}$ $Mathematical equation: $ 1212^{+27}_{-12} $$	$3380_{- 70}^{+ 110}$ $Mathematical equation: $ 3380^{+110}_{-70} $$	1.69 ± 0.02	$1 . 12_{- 0.06}^{+ 0.03}$ $Mathematical equation: $ 1.12^{+0.03}_{-0.06} $$

00410 – 00414	60188.37 – 60188.90	4400 ± 30	$1164_{- 15}^{+ 12}$ $Mathematical equation: $ 1164^{+12}_{-15} $$	$3230_{- 50}^{+ 70}$ $Mathematical equation: $ 3230^{+70}_{-50} $$	1.652 ± 0.007	$1 . 22_{- 0.04}^{+ 0.03}$ $Mathematical equation: $ 1.22^{+0.03}_{-0.04} $$

00605 – 00609	60191.61 – 60192.14	$3820_{- 40}^{+ 50}$ $Mathematical equation: $ 3820^{+50}_{-40} $$	$1090_{- 10}^{+ 11}$ $Mathematical equation: $ 1090^{+11}_{-10} $$	$3177_{- 15}^{+ 16}$ $Mathematical equation: $ 3177^{+16}_{-15} $$	$1 . 675_{- 0.019}^{+ 0.011}$ $Mathematical equation: $ 1.675^{+0.011}_{-0.019} $$	$1 . 11_{- 0.03}^{+ 0.05}$ $Mathematical equation: $ 1.11^{+0.05}_{-0.03} $$

00808 – 00904	60194.98 – 60195.51	$3573_{- 27}^{+ 18}$ $Mathematical equation: $ 3573^{+18}_{-27} $$	$969_{- 15}^{+ 16}$ $Mathematical equation: $ 969^{+16}_{-15} $$	$2840_{- 50}^{+ 40}$ $Mathematical equation: $ 2840^{+40}_{-50} $$	1.60 ± 0.02	$1 . 34_{- 0.04}^{+ 0.07}$ $Mathematical equation: $ 1.34^{+0.07}_{-0.04} $$

Notes. Only the last five digits of the exposure IDs are shown, with the common prefix P06143380 omitted for brevity.

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