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.1.

Continued.

ObsID	Γ	K_nthc×100	kT_seed	kT_bbody	K_bb	F₀₅₁₀	χ²
			(keV)	(keV)		(×10⁻¹⁰ erg cm⁻² s⁻¹)	(dof)
6203690165	1.69 $_{- 0.10}^{+ 0.09}$ ${}^{+0.09}_{-0.10}$	1.517±0.224	0.20 $_{- 0.02}^{+ 0.02}$ ${}^{+0.02}_{-0.02}$	=kT_seed	1484 $_{- 485}^{+ 1013}$ ${}^{+1013}_{-485}$	1.21±0.03	55(79)
6203690166	1.79±0.07	1.417±0.195	0.22 $_{- 0.02}^{+ 0.02}$ ${}^{+0.02}_{-0.02}$	=kT_seed	793 $_{- 178}^{+ 311}$ ${}^{+311}_{-178}$	1.04±0.01	110(88)
6203690169	1.77 $_{- 0.09}^{+ 0.08}$ ${}^{+0.08}_{-0.09}$	1.176±0.199	0.21 $_{- 0.03}^{+ 0.02}$ ${}^{+0.02}_{-0.03}$	=kT_seed	598 $_{- 163}^{+ 327}$ ${}^{+327}_{-163}$	0.86±0.02	88(87)
6203690170	1.81±0.08	1.263±0.183	0.21 $_{- 0.02}^{+ 0.02}$ ${}^{+0.02}_{-0.02}$	=kT_seed	788 $_{- 198}^{+ 363}$ ${}^{+363}_{-198}$	0.91±0.02	120(88)
6203690171	1.93±0.03	1.591±0.040	<0.13	-	-	0.81±0.01	92(88)
6203690172	1.87 $_{- 0.05}^{+ 0.06}$ ${}^{+0.06}_{-0.05}$	1.627±0.072	<0.15	-	-	0.88±0.03	95(77)
6203690173	1.89±0.04	1.359±0.173	<0.13	-	-	0.72±0.01	86(86)
6203690179	1.97 $_{- 0.10}^{+ 0.12}$ ${}^{+0.12}_{-0.10}$	1.299±0.098	<0.34	-	-	0.65±0.03	102(73)
6203690180	1.18 $_{- 0.12}^{+ 0.10}$ ${}^{+0.10}_{-0.12}$	0.716±0.114	0.17 $_{- 0.04}^{+ 0.04}$ ${}^{+0.04}_{-0.04}$	=kT_seed	1814 $_{- 1217}^{+ 6148}$ ${}^{+6148}_{-1217}$	1.02±0.04	106(80)
6203690181	1.99 $_{- 0.27}^{+ 0.43}$ ${}^{+0.43}_{-0.27}$	1.235±0.234	<0.44	-	-	0.66±0.07	62(47)
6203690185	1.80±0.03	1.270±0.030	<0.14	-	-	0.73±0.01	110(88)
6203690186	1.72±0.09	1.006±0.165	0.21 $_{- 0.03}^{+ 0.03}$ ${}^{+0.03}_{-0.03}$	=kT_seed	565 $_{- 176}^{+ 370}$ ${}^{+370}_{-176}$	0.77±0.02	77(86)
6203690187	1.83±0.05	1.324±0.048	<0.16	-	-	0.74±0.02	73(79)
6203690192	1.79±0.05	1.548±0.149	0.21 $_{- 0.02}^{+ 0.01}$ ${}^{+0.01}_{-0.02}$	=kT_seed	1035 $_{- 204}^{+ 317}$ ${}^{+317}_{-204}$	1.12±0.01	108(95)
6203690193	1.81±0.07	1.672±0.210	0.20 $_{- 0.02}^{+ 0.02}$ ${}^{+0.02}_{-0.02}$	=kT_seed	1187 $_{- 334}^{+ 655}$ ${}^{+655}_{-334}$	1.15±0.02	71(88)
6203690195	1.89 $_{- 0.09}^{+ 0.08}$ ${}^{+0.08}_{-0.09}$	1.775±0.262	0.22 $_{- 0.02}^{+ 0.02}$ ${}^{+0.02}_{-0.02}$	=kT_seed	1119 $_{- 232}^{+ 363}$ ${}^{+363}_{-232}$	1.23±0.02	92(87)
6203690196	1.64 $_{- 0.16}^{+ 0.14}$ ${}^{+0.14}_{-0.16}$	1.590±0.387	0.19 $_{- 0.04}^{+ 0.04}$ ${}^{+0.04}_{-0.04}$	=kT_seed	1693 $_{- 811}^{+ 3531}$ ${}^{+3531}_{-811}$	1.33±0.05	72(77)
6203690203	1.81 $_{- 0.12}^{+ 0.10}$ ${}^{+0.10}_{-0.12}$	1.154±0.249	0.22 $_{- 0.04}^{+ 0.03}$ ${}^{+0.03}_{-0.04}$	=kT_seed	554 $_{- 167}^{+ 400}$ ${}^{+400}_{-167}$	0.82±0.02	61(78)
6203690204	2.08 $_{- 0.06}^{+ 0.08}$ ${}^{+0.08}_{-0.06}$	1.768±0.052	<0.18	-	-	0.79±0.02	45(65)
6203690205	1.42 $_{- 0.16}^{+ 0.15}$ ${}^{+0.15}_{-0.16}$	0.734±0.160	0.24 $_{- 0.02}^{+ 0.02}$ ${}^{+0.02}_{-0.02}$	=kT_seed	511 $_{- 112}^{+ 175}$ ${}^{+175}_{-112}$	0.89±0.02	36(68)
6203690207	2.09±0.08	1.659±0.093	<0.14	-	-	0.74±0.03	72(72)
6203690209	2.05±0.04	1.530±0.050	<0.14	-	-	0.71±0.02	88(81)
6203690210	1.97 $_{- 0.05}^{+ 0.06}$ ${}^{+0.06}_{-0.05}$	1.434±0.044	<0.20	-	-	0.70±0.02	55(79)
6203690213	2.01±0.07	1.238±0.059	<0.16	-	-	0.59±0.02	90(74)
6203690215	1.72 $_{- 0.07}^{+ 0.06}$ ${}^{+0.06}_{-0.07}$	0.982±0.120	0.21 $_{- 0.02}^{+ 0.02}$ ${}^{+0.02}_{-0.02}$	=kT_seed	581 $_{- 142}^{+ 255}$ ${}^{+255}_{-142}$	0.76±0.01	107(90)
6203690219	2.04±0.06	1.446±0.067	<0.23	-	-	0.67±0.02	89(77)
6203690225	2.01±0.06	1.186±0.045	<0.14	-	-	0.57±0.02	84(77)
6203690226	1.68±0.07	1.086±0.057	<0.13	-	-	0.71±0.03	144(79)
6203690227	1.73 $_{- 0.09}^{+ 0.10}$ ${}^{+0.10}_{-0.09}$	0.869±0.064	<0.16	-	-	0.54±0.03	52(72)
6203690228	1.71±0.06	0.627±0.030	<0.15	-	-	0.40±0.01	89(78)
6203690229	1.92 $_{- 0.03}^{+ 0.04}$ ${}^{+0.04}_{-0.03}$	1.015±0.028	<0.13	-	-	0.52±0.01	77(88)

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

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