Multi-wavelength observations of IGR J17544-2619 from quiescence to outburst

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Volume 596 (December 2016)

A&A, 596 (2016) A16

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Table 4

Results of the fits to the combined XMM-Newton and NuSTAR spectra with the physical model introduced in Sect. 4.

Parameter	3	4	5	6	7	8	9

N_H (1E22 cm^-2)	1.9	1.3	1.2	1.2	1.1±0.1	1.0±0.4	1.0±0.3
kT_BB (keV)	1.5±0.1	1.7±0.2	1.6±0.3	1.5±0.2	1.4±0.1	1.4	1.2±0.2
N _BB	3.9	8.3	25	19.3	13.6	8.9	11.4
ξ	5.0	<15	4.5	5.4	5.7	5.7	<5.2
δ	0.8	0.4	0.7	0.6	0.3	0.7	<1.0
	0.05	0.17	0.48	0.32	0.16	0.12	0.08
T_e (keV)	3.2	3.4±0.3	2.9	3.0±0.3	3.4±0.3	2.8	3.7
r₀ (m)	<20	47	65±33	53	35	18	19
	2.2E-10	7.8E-10	2.4E-9	1.6E-9	7.6E-10	5.6E-10	3.8E-10
	4.6E-10	1.3E-9	3.6E-9	2.5E-9	1.3E-9	9.7E-10	6.6E-10
/d.o.f.	0.94/338	1.03/248	0.92/375	1.08/605	0.93/534	1.05/207	0.90/185
C _pn	0.96±0.05	0.96±0.07	0.95±0.05	0.97±0.04	1.04±0.04	1.02±0.07	0.98±0.07
C _MOS1	1.0±0.1	1.0±0.1	–	–	–	–	–
	1.0	1.0	1.0	1.0	1.0	1.0	1.0
C _FPMA	1.08±0.08	1.02±0.07	1.06±0.06	1.11±0.04	1.07±0.04	1.14±0.09	0.95±0.09
C _FPMB	1.13±0.07	1.02±0.07	1.11±0.06	1.11±0.04	1.11±0.05	1.13±0.09	1.00±0.08

Notes.

^(a)

The mass accretion rate is derived from the 0.5−30 keV X-ray flux using standard equations for the NS accretion, that is, L_X = GM_NSṀ/R_NS and L_X = 4πF_{0.5−30 keV}d² (here M_NS and R_NS are the mass and radius of the NS, whilst d is the source distance).

^(b)

The flux is given in erg cm^-2 s^-1.

^(c)

The MOS2 was used in all case as the reference instrument, therefore the corresponding normalization constant has been fixed to unity.

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