Broadband X-ray spectra and timing of the accreting millisecond pulsar Swift J1756.9–2508 during its 2018 and 2019 outbursts

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Table 2.

Best parameters determined from the fits to the broadband emission spectra of Swift J1756.9–2508 using the PHABS absorbed comptonization model COMPPS.

Parameter	Unit	2018 outburst	2019 outburst
N_H	(10²² cm⁻²)	4.29 ± 0.05	4.17 ± 0.12
kT_bb, seed	(keV)	0.79 ± 0.01	0.67 ± 0.02
kT_e	(keV)	41.6 ± 0.7	44.6 ± 1.3
τ_T		1.44 ± 0.02	1.23 ± 0.03
K_bb	(km²)	150 ± 9	156 ± 20
		1.11/1644	1.01/858
F_bol^(a)	(10⁻¹⁰ erg cm⁻² s⁻¹)	8.63 ± 0.06	4.44 ± 0.05

Notes. In the 2018 outburst, the spectra were obtained from the XMM-Newton, NICER, NuSTAR, and INTEGRAL. The NICER and NuSTAR spectra were utilized for the 2019 outburst. Uncertainties are given at 1σ confidence level.

^(a)

Unabsorbed flux in the 0.1–300 keV energy range.

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