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.

Best fit values of the single spectra with the black-body component.

ObsID	Γ	K_nthc×100	kT_seed	kT_bbody	K_bb	F₀₅₁₀	χ²
			(keV)	(keV)		(×10⁻¹⁰ erg cm⁻² s⁻¹)	(dof)
6203690102	2.01±0.04	3.887±0.297	0.22 $_{- 0.01}^{+ 0.01}$ ${}^{+0.01}_{-0.01}$	=kT_seed	1827 $_{- 200}^{+ 255}$ ${}^{+255}_{-200}$	2.34±0.02	137(96)
6203690104	2.23±0.05	4.560 $_{- 0.435}^{+ 0.680}$ ${}^{+0.680}_{-0.435}$	0.19 $_{- 0.04}^{+ 0.02}$ ${}^{+0.02}_{-0.04}$	=kT_seed	1188 $_{- 1188}^{+ 268}$ ${}^{+268}_{-1188}$	2.04±0.02	74(72)
6203690105	1.95±0.04	3.280±0.253	0.20 $_{- 0.01}^{+ 0.01}$ ${}^{+0.01}_{-0.01}$	=kT_seed	1768 $_{- 266}^{+ 385}$ ${}^{+385}_{-266}$	1.98±0.01	133(98)
6203690106	2.17 $_{- 0.03}^{+ 0.04}$ ${}^{+0.04}_{-0.03}$	4.430±0.082	<0.23	-	-	1.88±0.02	55(66)
6203690110	1.84±0.05	2.380±0.220	0.21 $_{- 0.01}^{+ 0.01}$ ${}^{+0.01}_{-0.01}$	=kT_seed	1362 $_{- 215}^{+ 300}$ ${}^{+300}_{-215}$	1.67±0.02	90(93)
6203690111	1.85±0.04	2.265±0.203	0.19 $_{- 0.02}^{+ 0.02}$ ${}^{+0.02}_{-0.02}$	=kT_seed	1401 $_{- 298}^{+ 526}$ ${}^{+526}_{-298}$	1.46±0.01	116(96)
6203690112	1.86±0.06	2.012±0.248	0.19 $_{- 0.03}^{+ 0.02}$ ${}^{+0.02}_{-0.03}$	=kT_seed	1171 $_{- 330}^{+ 804}$ ${}^{+804}_{-330}$	1.26±0.02	97(83)
6203690113	1.93±0.02	2.397±0.033	<0.11	-	-	1.22±0.01	100(90)
6203690114	1.77 $_{- 0.05}^{+ 0.04}$ ${}^{+0.04}_{-0.05}$	1.663±0.154	0.20 $_{- 0.02}^{+ 0.02}$ ${}^{+0.02}_{-0.02}$	=kT_seed	866 $_{- 179}^{+ 301}$ ${}^{+301}_{-179}$	1.18±0.01	110(97)
6203690116	1.66±0.05	1.183±0.117	0.20 $_{- 0.02}^{+ 0.02}$ ${}^{+0.02}_{-0.02}$	=kT_seed	618 $_{- 160}^{+ 312}$ ${}^{+312}_{-160}$	0.93±0.01	108(96)
6203690119	1.66±0.04	1.023±0.031	<0.12	-	-	0.68±0.02	120(80)
6203690120	1.70±0.03	0.994±0.013	<0.13	-	-	0.64±0.01	110(89)
6203690122	1.71±0.04	0.920±0.031	<0.13	-	-	0.58±0.01	88(78)
6203690123	1.66 $_{- 0.07}^{+ 0.09}$ ${}^{+0.09}_{-0.07}$	0.765±0.027	<0.24	-	-	0.51±0.02	61(56)
6203690124	1.45 $_{- 0.04}^{+ 0.05}$ ${}^{+0.05}_{-0.04}$	0.517±0.021	<0.15	-	-	0.44±0.01	79(83)
6203690130	1.39 $_{- 0.07}^{+ 0.09}$ ${}^{+0.09}_{-0.07}$	0.269±0.027	<0.40	-	-	0.26±0.01	57(74)
6203690131	1.49 $_{- 0.06}^{+ 0.07}$ ${}^{+0.07}_{-0.06}$	0.307±0.029	0.22 $_{- 0.22}^{+ 0.06}$ ${}^{+0.06}_{-0.22}$	-	-	0.27±0.01	77(84)
6203690134	1.58 $_{- 0.09}^{+ 0.12}$ ${}^{+0.12}_{-0.09}$	0.368±0.030	<0.37	-	-	0.28±0.01	56(59)
6203690135	1.34 $_{- 0.03}^{+ 0.04}$ ${}^{+0.04}_{-0.03}$	0.272±0.009	<0.19	-	-	0.27±0.01	78(88)
6203690136	1.40 $_{- 0.05}^{+ 0.06}$ ${}^{+0.06}_{-0.05}$	0.286±0.021	<0.36	-	-	0.27±0.01	70(85)
6203690137	1.40±0.04	0.279±0.010	<0.19	-	-	0.26±0.01	58(80)
6203690138	1.32 $_{- 0.07}^{+ 0.06}$ ${}^{+0.06}_{-0.07}$	0.272±0.015	<0.18	-	-	0.28±0.01	49(62)
6203690139	1.28 $_{- 0.06}^{+ 0.07}$ ${}^{+0.07}_{-0.06}$	0.306±0.020	<0.22	-	-	0.33±0.02	73(71)
6203690140	1.39 $_{- 0.08}^{+ 0.09}$ ${}^{+0.09}_{-0.08}$	0.313±0.020	<0.17	-	-	0.29±0.02	63(57)
6203690145	1.33 $_{- 0.05}^{+ 0.06}$ ${}^{+0.06}_{-0.05}$	0.217±0.014	<0.22	-	-	0.22±0.01	65(73)
6203690149	1.87 $_{- 0.35}^{+ 0.74}$ ${}^{+0.74}_{-0.35}$	0.117±0.030	0.36 $_{- 0.18}^{+ 0.15}$ ${}^{+0.15}_{-0.18}$	-	-	0.10±0.01	52(52)
6203690151	1.00 $_{- 1.00}^{+ 0.17}$ ${}^{+0.17}_{-1.00}$	0.063±0.021	<0.74	-	-	0.14±0.01	57(58)
6203690152	1.00 $_{- 1.00}^{+ 0.07}$ ${}^{+0.07}_{-1.00}$	0.093±0.007	<0.27	-	-	0.16±0.01	48(57)
6203690157	1.96 $_{- 0.02}^{+ 0.03}$ ${}^{+0.03}_{-0.02}$	1.748±0.028	<0.11	-	-	0.87±0.01	119(90)
6203690159	1.78±0.09	1.354±0.220	0.23 $_{- 0.02}^{+ 0.02}$ ${}^{+0.02}_{-0.02}$	=kT_seed	654 $_{- 145}^{+ 243}$ ${}^{+243}_{-145}$	1.03±0.02	96(88)
6203690160	1.95 $_{- 0.04}^{+ 0.05}$ ${}^{+0.05}_{-0.04}$	1.951±0.061	<0.22	-	-	0.97±0.02	111(79)
6203690162	1.80 $_{- 0.10}^{+ 0.09}$ ${}^{+0.09}_{-0.10}$	1.382±0.247	0.21 $_{- 0.03}^{+ 0.02}$ ${}^{+0.02}_{-0.03}$	=kT_seed	745 $_{- 216}^{+ 443}$ ${}^{+443}_{-216}$	0.99±0.02	83(81)
6203690163	1.76±0.06	1.358±0.140	0.21 $_{- 0.02}^{+ 0.02}$ ${}^{+0.02}_{-0.02}$	=kT_seed	877 $_{- 181}^{+ 287}$ ${}^{+287}_{-181}$	1.01±0.01	93(87)

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