Unveiling hidden millihertz quasi-periodic oscillations in 1A 0535+262

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Volume 709 (May 2026)

A&A, 709 (2026) A281

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Table C.1.

NICER and HXMT observation log and QPO parameters for 1A 0535+262.

Regroup-ID	NICER-ID	HXMT-ID	Start time (MJD)	QPO Frequency (mHz)	Luminosity (10³⁷ erg/s)
Day1	3200360130	P031431600101	59167.33	$62 . 0_{- 3.8}^{+ 4.4}$ $Mathematical equation: $ 62.0^{+4.4}_{-3.8} $$	7.48
		P031431600102	59167.49
		P031431600103	59167.63
		P031431600105	59167.89

Day2	3200360131	P031431600106	59168.03	$74 . 0_{- 3.5}^{+ 3.2}$ $Mathematical equation: $ 74.0^{+3.2}_{-3.5} $$	9.06
		P031431600107	59168.16
		P031431600108	59168.29
		P031431600109	59168.42
		P031431600110	59168.56
		P031431600112	59168.82
		P031431600113	59168.95

Day3	3200360132	P031431600202	59169.40	$88 . 0_{- 2.4}^{+ 2.4}$ $Mathematical equation: $ 88.0^{+2.4}_{-2.4} $$	10.78
		P031431600203	59169.55
		P031431600204	59169.68
		P031431600205	59169.82
		P031431600206	59169.95

Day4	3200360133	P031431600207	59170.08	$89 . 0_{- 3.5}^{+ 3.2}$ $Mathematical equation: $ 89.0^{+3.2}_{-3.5} $$	11.61
		P031431600209	59170.35
		P031431600210	59170.47
		P031431600211	59170.61
		P031431600212	59170.74
		P031431600213	59170.88

Day5	3200360134	P031431600214	59171.01	$86 . 4_{- 2.3}^{+ 2.4}$ $Mathematical equation: $ 86.4^{+2.4}_{-2.3} $$	12.42
		P031431600301	59171.30
		P031431600302	59171.47
		P031431600303	59171.60
		P031431600304	59171.74
		P031431600305	59171.87

Day6	3200360135	P031431600306	59172.00	$87 . 8_{- 2.4}^{+ 2.1}$ $Mathematical equation: $ 87.8^{+2.1}_{-2.4} $$	12.18
		P031431600309	59172.40
		P031431600310	59172.53
		P031431600311	59172.66
		P031431600312	59172.80
		P031431600313	59172.93

Day7	3200360136	P031431600314	59173.06	$91 . 0_{- 2.9}^{+ 2.6}$ $Mathematical equation: $ 91.0^{+2.6}_{-2.9} $$	12.52
		P031431600316	59173.33
		P031431600317	59173.45
		P031431600319	59173.72
		P031431600320	59173.86

Day8	3200360137	P031431600401	59174.22	$84 . 9_{- 2.3}^{+ 2.4}$ $Mathematical equation: $ 84.9^{+2.4}_{-2.3} $$	11.80
		P031431600402	59174.37
		P031431600403	59174.52
		P031431600404	59174.65
		P031431600405	59174.78
		P031431600406	59174.92

Day9	3200360138	P031431600407	59175.05	$85 . 1_{- 2.3}^{+ 2.2}$ $Mathematical equation: $ 85.1^{+2.2}_{-2.3} $$	11.88
		P031431600408	59175.18
		P031431600409	59175.31
		P031431600410	59175.44
		P031431600411	59175.58
		P031431600412	59175.71
		P031431600413	59175.84
		P031431600414	59175.98

Day10	3200360139	/	/	$81 . 2_{- 4.5}^{+ 2.6}$ $Mathematical equation: $ 81.2^{+2.6}_{-4.5} $$	11.49

Day11	3200360140	P031431600504	59177.70	$82 . 2_{- 4.2}^{+ 4.2}$ $Mathematical equation: $ 82.2^{+4.2}_{-4.2} $$	11.10
		P031431600505	59177.83
		P031431600506	59177.96

Day12	/	P031431600508	59178.23	$82 . 2_{- 0.1}^{+ 0.3}$ $Mathematical equation: $ 82.2^{+0.3}_{-0.1} $$	10.89
		P031431600509	59178.36
		P031431600511	59178.63
		P031431600512	59178.76
		P031431600513	59178.89

Day13	3200360141	P031431600515	59179.16	$82 . 1_{- 1.9}^{+ 2.0}$ $Mathematical equation: $ 82.1^{+2.0}_{-1.9} $$	10.61
		P031431600516	59179.29
		P031431600517	59179.41
		P031431600518	59179.55
		P031431600519	59179.69
		P031431600520	59179.82
		P031431600521	59179.95
Day14	3200360142	P031431600601	59180.25	$80 . 9_{- 1.6}^{+ 1.0}$ $Mathematical equation: $ 80.9^{+1.0}_{-1.6} $$	10.16
		P031431600602	59180.41
		P031431600603	59180.55
		P031431600604	59180.68
		P031431600605	59180.81

Day15	3200360143	P031431600608	59181.21	$77 . 7_{- 1.9}^{+ 2.0}$ $Mathematical equation: $ 77.7^{+2.0}_{-1.9} $$	9.53
		P031431600609	59181.34
		P031431600610	59181.47
		P031431600611	59181.61
		P031431600612	59181.74
		P031431600613	59181.87

Day16	3200360144	P031431600615	59182.14	$69 . 5_{- 0.9}^{+ 0.1}$ $Mathematical equation: $ 69.5^{+0.1}_{-0.9} $$	8.80
		P031431600616	59182.27
		P031431600617	59182.41
		P031431600618	59182.53
		P031431600619	59182.67
		P031431600620	59182.80
		P031431600621	59182.94

Day17	3200360145	P031431600801	59183.30	$69 . 3_{- 0.6}^{+ 0.9}$ $Mathematical equation: $ 69.3^{+0.9}_{-0.6} $$	7.92
		P031431600802	59183.46
		P031431600803	59183.60
		P031431600804	59183.73
		P031431600805	59183.87

Day18	/	P031431600807	59184.13	$67 . 5_{- 0.2}^{+ 0.2}$ $Mathematical equation: $ 67.5^{+0.2}_{-0.2} $$	7.88
		P031431600808	59184.26
		P031431600809	59184.40
		P031431600810	59184.53
		P031431600811	59184.66
		P031431600812	59184.79
		P031431600814	59185.09

Day19	/	P031431600815	59185.24	$66 . 3_{- 0.6}^{+ 1.1}$ $Mathematical equation: $ 66.3^{+1.1}_{-0.6} $$	7.66
		P031431600816	59185.32
		P031431600817	59185.46
		P031431600818	59185.59
		P031431600819	59185.72
		P031431600820	59185.86

Day20	3200360147	P031431600901	59186.21	$64 . 2_{- 0.9}^{+ 0.1}$ $Mathematical equation: $ 64.2^{+0.1}_{-0.9} $$	6.92
		P031431600902	59186.37
		P031431600903	59186.51

Day21	3200360148	P031431600905	59187.01	$58 . 5_{- 0.7}^{+ 1.2}$ $Mathematical equation: $ 58.5^{+1.2}_{-0.7} $$	6.27
		P031431600906	59187.15
		P031431600907	59187.29

Day22	3200360149	P031431600910	59188.00	$56 . 5_{- 1.1}^{+ 1.7}$ $Mathematical equation: $ 56.5^{+1.7}_{-1.1} $$	5.67
		P031431600911	59188.14
		P031431600912	59188.29
		P031431600913	59188.42
		P031431600914	59188.81

Day23	3200360150	P031431601001	59189.27	$53 . 7_{- 1.8}^{+ 0.4}$ $Mathematical equation: $ 53.7^{+0.4}_{-1.8} $$	5.23
		P031431601002	59189.42
		P031431601003	59189.80
		P031431601004	59189.92

Day24	3200360151	P031431601005	59190.06	$53 . 2_{- 2.9}^{+ 0.5}$ $Mathematical equation: $ 53.2^{+0.5}_{-2.9} $$	4.98
		P031431601006	59190.20
		P031431601007	59190.34
		P031431601008	59190.79
		P031431601009	59190.92
Day25	3200360152	P031431601010	59191.05	$49 . 0_{- 0.1}^{+ 0.3}$ $Mathematical equation: $ 49.0^{+0.3}_{-0.1} $$	4.19
		P031431601011	59191.20
		P031431601013	59191.50
		P031431601014	59191.63
		P031431601015	59191.76
		P031431601016	59191.90

Day26	3200360153	P031431601101	59192.19	/	3.70
		P031431601102	59192.33
		P031431601103	59192.49
		P031431601104	59192.62
		P031431601105	59192.76

Day27	3200360154	P031431601107	59193.02	$44 . 1_{- 3.1}^{+ 3.9}$ $Mathematical equation: $ 44.1^{+3.9}_{-3.1} $$	3.52
		P031431601108	59193.15
		P031431601109	59193.29
		P031431601110	59193.42
		P031431601111	59193.55
		P031431601112	59193.68
		P031431601113	59193.81
		P031431601114	59193.95

Day28	3200360155	P031431601115	59194.08	$40 . 6_{- 1.8}^{+ 2.0}$ $Mathematical equation: $ 40.6^{+2.0}_{-1.8} $$	3.20
		P031431601116	59194.21
		P031431601117	59194.34
		P031431601118	59194.48
		P031431601119	59194.61
		P031431601120	59194.74

Notes. The QPO centroid frequencies are taken from fits in the 50–65 keV band, except for Day 10, for which the NICER 2–5 keV band is used. Typical uncertainties on the luminosities listed in the last column are of order 1%.

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