The nature of the X-ray binary transient MAXI J1834–021: Clues from its first observed outburst

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Volume 699 (July 2025)

A&A, 699 (2025) A114

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Table B.2.

Continued.

ObsID	Γ	K_nthc×100	kT_seed	kT_disk	K_disk	F₀₅₁₀	χ²
			(keV)	(keV)		(×10⁻¹⁰ erg cm⁻² s⁻¹)	(dof)
6203690170	1.76 $_{- 0.10}^{+ 0.09}$ ${}^{+0.09}_{-0.10}$	1.221±0.200	0.31 $_{- 0.04}^{+ 0.04}$ ${}^{+0.04}_{-0.04}$	=kT_seed	131 $_{- 44}^{+ 89}$ ${}^{+89}_{-44}$	0.93±0.02	117(88)
6203690171	1.93±0.03	1.592±0.040	0.01 $_{- 0.01}^{+ 0.18}$ ${}^{+0.18}_{-0.01}$	-	-	0.81±0.01	92(88)
6203690172	1.87 $_{- 0.05}^{+ 0.06}$ ${}^{+0.06}_{-0.05}$	1.626±0.053	<0.22	-	-	0.88±0.03	95(77)
6203690173	1.89±0.04	1.360±0.041	<0.19	-	-	0.72±0.01	86(86)
6203690179	1.97 $_{- 0.10}^{+ 0.14}$ ${}^{+0.14}_{-0.10}$	1.307±0.094	<0.50	-	-	0.66±0.03	102(73)
6203690180	1.11 $_{- 1.11}^{+ 0.14}$ ${}^{+0.14}_{-1.11}$	0.656±0.145	0.26 $_{- 0.08}^{+ 0.08}$ ${}^{+0.08}_{-0.08}$	=kT_seed	257 $_{- 210}^{+ 1273}$ ${}^{+1273}_{-210}$	1.02±0.04	104(80)
6203690181	2.06 $_{- 0.32}^{+ 1.16}$ ${}^{+1.16}_{-0.32}$	1.240±0.230	<0.79	-	-	0.66±0.07	61(47)
6203690185	1.80±0.03	1.270±0.030	<0.20	-	-	0.73±0.01	110(88)
6203690186	1.68 $_{- 0.13}^{+ 0.11}$ ${}^{+0.11}_{-0.13}$	0.996±0.190	0.31 $_{- 0.06}^{+ 0.06}$ ${}^{+0.06}_{-0.06}$	=kT_seed	92 $_{- 40}^{+ 108}$ ${}^{+108}_{-40}$	0.79±0.02	78(86)
6203690187	1.83±0.05	1.324±0.129	<0.25	-	-	0.74±0.02	73(79)
6203690192	1.72±0.07	1.438±0.165	0.32 $_{- 0.03}^{+ 0.03}$ ${}^{+0.03}_{-0.03}$	=kT_seed	157 $_{- 39}^{+ 64}$ ${}^{+64}_{-39}$	1.15±0.01	97(95)
6203690193	1.77 $_{- 0.10}^{+ 0.08}$ ${}^{+0.08}_{-0.10}$	1.632±0.244	0.29 $_{- 0.05}^{+ 0.04}$ ${}^{+0.04}_{-0.05}$	=kT_seed	205 $_{- 79}^{+ 187}$ ${}^{+187}_{-79}$	1.17±0.02	70(88)
6203690195	1.82 $_{- 0.12}^{+ 0.11}$ ${}^{+0.11}_{-0.12}$	1.660±0.306	0.33 $_{- 0.04}^{+ 0.04}$ ${}^{+0.04}_{-0.04}$	=kT_seed	178 $_{- 50}^{+ 87}$ ${}^{+87}_{-50}$	1.27±0.02	90(87)
6203690196	1.57 $_{- 0.23}^{+ 0.18}$ ${}^{+0.18}_{-0.23}$	1.481±0.453	0.29 $_{- 0.09}^{+ 0.08}$ ${}^{+0.08}_{-0.09}$	=kT_seed	279 $_{- 170}^{+ 1016}$ ${}^{+1016}_{-170}$	1.36±0.05	71(77)
6203690203	1.76 $_{- 0.16}^{+ 0.13}$ ${}^{+0.13}_{-0.16}$	1.120±0.272	0.32 $_{- 0.07}^{+ 0.06}$ ${}^{+0.06}_{-0.07}$	=kT_seed	87 $_{- 35}^{+ 98}$ ${}^{+98}_{-35}$	0.84±0.02	59(78)
6203690204	2.08 $_{- 0.06}^{+ 0.08}$ ${}^{+0.08}_{-0.06}$	1.767±0.062	<0.24	-	-	0.79±0.02	45(65)
6203690207	2.08 $_{- 0.07}^{+ 0.08}$ ${}^{+0.08}_{-0.07}$	1.655±0.094	<0.20	-	-	0.74±0.03	72(72)
6203690209	2.05 $_{- 0.04}^{+ 0.05}$ ${}^{+0.05}_{-0.04}$	1.530±0.059	<0.20	-	-	0.71±0.02	88(81)
6203690210	1.97 $_{- 0.05}^{+ 0.06}$ ${}^{+0.06}_{-0.05}$	1.434±0.050	<0.25	-	-	0.70±0.02	56(79)
6203690213	2.01±0.07	1.238±0.040	<0.23	-	-	0.59±0.02	90(74)
6203690215	1.64 $_{- 0.10}^{+ 0.09}$ ${}^{+0.09}_{-0.10}$	0.900±0.138	0.33 $_{- 0.04}^{+ 0.04}$ ${}^{+0.04}_{-0.04}$	=kT_seed	80 $_{- 25}^{+ 49}$ ${}^{+49}_{-25}$	0.78±0.01	100(90)
6203690219	2.04 $_{- 0.07}^{+ 0.09}$ ${}^{+0.09}_{-0.07}$	1.441±0.071	<0.35	-	-	0.67±0.02	89(77)
6203690225	2.00 $_{- 0.05}^{+ 0.06}$ ${}^{+0.06}_{-0.05}$	1.185±0.052	<0.20	-	-	0.57±0.02	84(77)
6203690226	1.25 $_{- 1.25}^{+ 0.23}$ ${}^{+0.23}_{-1.25}$	0.605±0.288	0.31 $_{- 0.11}^{+ 0.12}$ ${}^{+0.12}_{-0.11}$	=kT_seed	107 $_{- 78}^{+ 681}$ ${}^{+681}_{-78}$	0.83±0.04	118(78)
6203690227	1.74 $_{- 0.10}^{+ 0.09}$ ${}^{+0.09}_{-0.10}$	0.872±0.101	<0.26	-	-	0.54±0.03	52(72)
6203690228	1.71±0.06	0.627±0.016	<0.25	-	-	0.40±0.01	89(78)
6203690229	1.92 $_{- 0.04}^{+ 0.03}$ ${}^{+0.03}_{-0.04}$	1.016±0.030	<0.18	-	-	0.52±0.01	77(88)

Notes. The results derive from the modelling of the single NICER spectra using Model 0 or Model 1B, according to the statistical significance of the fit in each case. K_nthc and K_disc are the normalisations of the nthcomp and diskbb components, respectively. The unabsorbed flux is estimated in the 0.5–10 keV energy interval.

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