Line detections in photospheric radius expansion bursts from 4U 1820-303 - Confirmation of previous detections and their temporal evolution

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Volume 694 (February 2025)

A&A, 694 (2025) A266

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Table D.1.

Results of the PION - CIE - XABS modelling added to the continuum model for the 12 bursts.

Fit parameter	Burst 1	Burst 2	Burst 3	Burst 4	Burst 5	Burst 6

			PION MODEL (EMISSION): `hot * (pion + bb + comt)`
n_H	0.02 ± 0.02	0.58 ± $_{0.46}^{1.74}$ $_{0.46}^{1.74}$	0.016 ± 0.005	0.010 ± 0.002	0.06 ± 0.04	0.045 ± 0.006
log ξ	2.73 ± 0.21	3.73 ± 0.35	2.52 ± 0.11	2.23 ± 0.05	3.02 ± 0.14	3.00 ± 0.04
v_LOS	-0.024 ± 0.021	-0.015 ± 0.011	-0.05 ± 0.01	-0.04 ± 0.01	0.03 ± 0.02	0.009 ± $_{0.008}^{0.014}$ $_{0.008}^{0.014}$
L_PION	0.15 ± 0.14	0.21 ± $_{0.13}^{0.61}$ $_{0.13}^{0.61}$	0.17 ± 0.05	0.21 ± 0.05	0.18 ± 0.12	0.16 ± 0.02
L_Bol,tot	3.85 ± 0.20	4.31 ± 0.31	4.09 ± 0.35	4.15 ± 0.24	3.95 ± 0.33	3.70 ± 0.04
C_stat/d.o.f	105/61	56/62	88/63	139/63	82/62	126/61

			CIE MODEL (EMISSION): `hot * (cie + bb + comt)`

Norm	164.2 ± 77.5	50.42 ± $_{27.3}^{125.5}$ $_{27.3}^{125.5}$	151.6 ± 35.0	82.06 ± 34.60	272 ± $_{109}^{337}$ $_{109}^{337}$	176.3 ± 84.5
T_CIE	1.39 ± 0.03	1.36 ± $_{0.24}^{1.02}$ $_{0.24}^{1.02}$	1.2 ± 0.1	1.19 ± 0.12	1.69 ± $_{0.27}^{0.92}$ $_{0.27}^{0.92}$	1.37 ± $_{0.05}^{0.20}$ $_{0.05}^{0.20}$
v_LOS	-0.01 ± 0.02	-0.01 ± 0.05	-0.04 ± 0.01	0.018 ± 0.019	0.037 ± 0.025	0.005 ± 0.024
L_CIE	0.32 ± 0.15	0.13 ± 0.19	0.26 ± 0.06	0.16 ± 0.03	0.89 ± $_{0.36}^{1.10}$ $_{0.36}^{1.10}$	0.33 ± 0.16
L_Bol,tot	3.85 ± 0.15	4.15 ± 0.19	4.08 ± 0.06	4.18 ± 0.03	4.0 ± 0.7	3.55 ± 0.16
C_stat/d.o.f	107/61	60/62	89/63	159/63	83/62	128/61

			XABS MODEL (ABSORPTION): `hot * (xabs * (bb + comt))`

n_H	6.58 ± 0.07	1.15 ± 0.76	12.24 ± 0.74	0.0018 ± 0.0006	0.0020 ± 0.0007	0.04 ± 0.01
log ξ	4.24 ± 0.20	3.89 ± 0.41	4.48 ± 0.14	1.97 ± 0.16	1.46 ± 0.09	3.08 ± 0.04
v_LOS	-0.125 ± 0.006	-0.24 ± 0.01	-0.319 ± 0.006	-0.422 ± 0.007	-0.169 ± 0.012	-0.332 ± 0.006
L_Bol,tot	1.27 ± 0.38 (10³⁹ erg/s)	5.86 ± $_{0.74}^{3.63}$ $_{0.74}^{3.63}$	2.20 ± 0.20 (10³⁹ erg/s)	4.33 ± 0.29	4.36 ± 0.29	0.945 ± 0.090
C_stat/d.o.f	113/61	57/62	125/65	153/63	93/62	107/61


Fit parameter	Burst 7	Burst 8	Burst 9	Burst 10	Burst 11	Burst 12

			PION MODEL (EMISSION): `hot * (pion + bb + comt)`

n_H	0.07 ± 0.04	0.07 ± 0.03	0.03 ± 0.01	0.008 ± 0.002	0.016 ± 0.010	0.098 ± 0.023
log ξ	3.07 ± 0.12	3.31 ± 0.07	2.95 ± 0.05	2.20 ± 0.11	2.86 ± 0.17	3.10 ± 0.12
v_LOS	0.006 ± 0.010	0.011 ± 0.011	0.029 ± $_{0.013}^{0.008}$ $_{0.013}^{0.008}$	-0.07 ± 0.02	0.006 ± 0.014	0.014 ± 0.006
L_PION	0.19 ± 0.11	0.15 ± 0.06	0.15 ± 0.05	0.16 ± 0.05	0.009 ± $_{0.004}^{0.008}$ $_{0.004}^{0.008}$	0.25 ± 0.06
L_Bol,tot	3.00 ± 0.10	2.44 ± 0.08	3.85 ± 0.08	4.04 ± 0.28	3.59 ± 0.42	4.01 ± 0.09
$C_{stat} / d . o . f$ $C_{\mathrm{stat}}/ \rm d.o.f$	104/60	109/54	155/63	118/62	101/61	125/62

			CIE MODEL (EMISSION): `hot * (cie + bb + comt)`

Norm	226.8 ± $_{35.5}^{79.9}$ $_{35.5}^{79.9}$	130.93 ± 25.25	169.51 ± $_{14.74}^{77.84}$ $_{14.74}^{77.84}$	1497.8 ± 126.83	802.38 ± $_{44.59}^{159.46}$ $_{44.59}^{159.46}$	381 ± $_{20}^{136}$ $_{20}^{136}$
T_CIE	1.45 ± 0.08	1.08 ± 0.05	1.28 ± 0.05	4.60 ± 0.54	4.24 ± $_{0.46}^{1.28}$ $_{0.46}^{1.28}$	1.73 ± $_{0.28}^{0.10}$ $_{0.28}^{0.10}$
v_LOS	-0.006 ± 0.009	-0.05 ± 0.01	0.02 ± 0.01	0.02 ± 0.01	0.014 ± 0.011	0.016 ± 0.007
L_CIE	0.36 ± $_{0.04}^{0.13}$ $_{0.04}^{0.13}$	0.24 ± 0.05	0.26 ± $_{0.02}^{0.12}$ $_{0.02}^{0.12}$	2.69 ± 0.22	1.37 ± $_{0.08}^{0.27}$ $_{0.08}^{0.27}$	0.53 ± $_{0.03}^{0.19}$ $_{0.03}^{0.19}$
L_Bol,tot	3.04 ± 0.09	2.48 ± 0.05	3.90 ± 0.07	4.80 ± 0.22	3.24 ± 0.27	4.12 ± 0.11
$C_{stat} / d . o . f$ $C_{\mathrm{stat}}/ \rm d.o.f$	108/60	101/54	131/60	119/62	101/61	129/62

			XABS MODEL (ABSORPTION): `hot * (xabs * (bb + comt))`

n_H	0.04 ± $_{0.01}^{0.49}$ $_{0.01}^{0.49}$	0.009 ± 0.002	0.003 ± 0.001	27.25 ± $_{15.00}^{29.80}$ $_{15.00}^{29.80}$	0.013 ± 0.007	0.03 ± 0.01
log ξ	3.34 ± $_{0.07}^{0.81}$ $_{0.07}^{0.81}$	2.50 ± 0.13	1.67 ± 0.02	4.8 ± 0.1	2.90 ± 0.13	3.14 ± 0.05
v_LOS	-0.27 ± 0.01	-0.293 ± $_{0.001}^{0.019}$ $_{0.001}^{0.019}$	-0.397 ± 0.006	-0.140 ± 0.004	-0.183 ± 0.014	-0.306 ± $_{0}^{0.003}$ $_{0}^{0.003}$
L_Bol,tot	3.08 ± 0.09	2.61 ± 0.41	4.38 ± 0.26	1.22 ± 0.854 (10⁴⁰ erg/s)	3.86 ± $_{0.13}^{0.58}$ $_{0.13}^{0.58}$	4.15 ± 0.99
$C_{stat} / d . o . f$ $C_{\mathrm{stat}}/ \rm d.o.f$	127/60	107/54	126/60	126/62	103/61	147/62

Notes. The luminosities L for the pion and cie model and L_Bol,tot are calculated in the 0.3-10 keV and 0.1-20 keV band, respectively, and expressed in 10³⁸ erg/s unit. The line of sight velocities v_LOS are expressed are expressed in c unit. The ionisation parameter ξ is expressed in erg/s cm unit. The n_H column density parameter is expressed in 10²⁴/cm² unit.

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