New polarimetric study of the galactic X-ray burster GX 13+1

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Volume 688 (August 2024)

A&A, 688 (2024) A217

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Table 2.

Best-fit parameters for the tbabs*(diskbb+bbodyrad) spectral model as obtained by the different Swift/XRT spectra.

ObsID	`tbabs`	`diskbb`		`bbodyrad`		χ²/d.o.f.	Flux_{2 − 8 keV}	Hardness

	N_H (10²² cm⁻²)	kT_in (keV)	norm	kT_bb (keV)	norm		(10⁻⁹ erg cm⁻² s⁻¹)
00036688043	$4 . 54_{- 0.14}^{+ 0.18}$ $4.54^{+0.18}_{-0.14}$	$1 . 1_{- 0.2}^{+ 0.6}$ $1.1^{+0.6}_{-0.2}$	$250_{- 160}^{+ 260}$ $250^{+260}_{-160}$	$1 . 5_{- 0.1}^{+ 0.6}$ $1.5^{+0.6}_{-0.1}$	$100_{- 90}^{+ 60}$ $100^{+60}_{-90}$	0.93	6.0	0.35
00036688048	4.52 ± 0.10	[1.0]	290 ± 19	1.52 ± 0.04	120 ± 12	0.91	5.9	0.37
00036688045	5.71 ± 0.19	0.67 ± 0.05	1100 ± 400	1.57 ± 0.04	100 ± 10	1.13	4.1	0.45
00036688042	5.0 ± 0.2	$0 . 70_{- 0.07}^{+ 0.10}$ $0.70^{+0.10}_{-0.07}$	$1000_{- 400}^{+ 700}$ $1000^{+700}_{-400}$	$1 . 41_{- 0.04}^{+ 0.06}$ $1.41^{+0.06}_{-0.04}$	150 ± 30	1.06	5.9	0.38
00036688047	$4 . 62_{- 0.18}^{+ 0.14}$ $4.62_{-0.18}^{+0.14}$	$0 . 88_{- 0.10}^{+ 0.38}$ $0.88_{-0.10}^{+0.38}$	500 ± 300	$1 . 38_{- 0.05}^{+ 0.18}$ $1.38^{+0.18}_{-0.05}$	$200_{- 100}^{+ 40}$ $200_{-100}^{+40}$	1.12	6.0	0.36
00036688044	$4 . 67_{- 0.15}^{+ 0.17}$ $4.67_{-0.15}^{+0.17}$	$0 . 98_{- 0.15}^{+ 0.39}$ $0.98_{-0.15}^{+0.39}$	$400_{- 200}^{+ 300}$ $400^{+300}_{-200}$	$1 . 46_{- 0.09}^{+ 0.31}$ $1.46^{+0.31}_{-0.09}$	$130_{- 100}^{+ 60}$ $130_{-100}^{+60}$	1.04	5.9	0.33
00036688046	$4 . 9_{- 0.2}^{+ 0.3}$ $4.9_{-0.2}^{+0.3}$	$0 . 70_{- 0.08}^{+ 0.11}$ $0.70^{+0.11}_{-0.08}$	$1100_{- 600}^{+ 900}$ $1100_{-600}^{+900}$	$1 . 29_{- 0.04}^{+ 0.06}$ $1.29_{-0.04}^{+0.06}$	$230_{- 50}^{+ 40}$ $230^{+40}_{-50}$	1.10	5.0	0.33
00036688049	4.3 ± 0.3	$1 . 0_{- 0.2}^{+ 0.6}$ $1.0_{-0.2}^{+0.6}$	$320_{- 260}^{+ 630}$ $320_{-260}^{+630}$	$1 . 7_{- 0.1}^{+ 1.3}$ $1.7_{-0.1}^{+1.3}$	$80_{- 75}^{+ 65}$ $80_{-75}^{+65}$	1.16	5.4	0.34
00036688050	5.7 ± 0.4	$0 . 66_{- 0.09}^{+ 0.12}$ $0.66^{+0.12}_{-0.09}$	$1800_{- 1000}^{+ 2000}$ $1800_{-1000}^{+2000}$	$1 . 46_{- 0.08}^{+ 0.11}$ $1.46_{-0.08}^{+0.11}$	130 ± 40	0.92	4.7	0.36
00036688051	$4 . 70_{- 0.09}^{+ 0.12}$ $4.70_{-0.09}^{+0.12}$	$1 . 13_{- 0.16}^{+ 0.19}$ $1.13^{+0.19}_{-0.16}$	$310_{- 120}^{+ 200}$ $310_{-120}^{+200}$	$1 . 77_{- 0.17}^{+ 0.28}$ $1.77_{-0.17}^{+0.28}$	$80_{- 40}^{+ 50}$ $80_{-40}^{+50}$	1.16	7.9	0.35

Notes. The fits are performed in the energy band 0.7−8.0 keV. Errors correspond to the 68% CL. The reported flux has a typical uncertainty on the order of 0.3 × 10⁻⁹. The hardness is defined as in Eq. (1).

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