Searching for orbital period modulation in X-ray observations of the symbiotic X-ray binary GX 1+4

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Volume 692 (December 2024)

A&A, 692 (2024) A19

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Table 2.

Results of the spectral analysis using Swift/XRT data.

Parameter	Orbital phase 0	Orbital phase 0.15	Orbital phase 0.35
Start time [MJD]	53416.8596	57309.3916	60507.7666
End Time [MJD]	53425.7042	57309.4113	60507.7886
Exposure [ks]	57	1.7	1.9
N_H [10²²cm⁻²]	47.8 $_{- 1.7}^{+ 1.7}$ $^{+1.7}_{-1.7}$	3.5 $_{- 1.0}^{+ 1.1}$ $^{+1.1}_{-1.0}$	3.99 $_{- 0.48}^{+ 0.51}$ $^{+0.51}_{-0.48}$
Photon Index Γ	1.74 $_{- 0.12}^{+ 0.12}$ $^{+0.12}_{-0.12}$	0.6 $_{- 0.3}^{+ 0.3}$ $^{+0.3}_{-0.3}$	0.59 $_{- 0.13}^{+ 0.14}$ $^{+0.14}_{-0.13}$
Powerlaw Norm	0.029 $_{- 0.004}^{+ 0.006}$ $^{+0.006}_{-0.004}$	0.014 $_{- 0.005}^{+ 0.008}$ $^{+0.008}_{-0.005}$	0.03 $_{- 0.005}^{+ 0.007}$ $^{+0.007}_{-0.005}$
0.3–10 keV Flux [10⁻¹¹erg/cm²/s]	2.61 $_{- 0.17}^{+ 0.01}$ $^{+0.01}_{-0.17}$	25.6 $_{- 10.3}^{+ 0.3}$ $^{+0.3}_{-10.3}$	74.8 $_{- 20.4}^{+ 2.1}$ $^{+2.1}_{-20.4}$
cstat	727.33	153.00	484.59
d.o.f.	723	160	519

Notes. The first column lists the relevant parameters of the spectral analysis. The remaining columns list the corresponding results of the analysis of the observations at the three orbital phases. The quoted uncertainties are given at the 68% confidence level.

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