Burst-recurrence properties revealed with Insight-HXMT and NICER for the newly discovered accreting millisecond pulsar MAXI J1816–195

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Volume 689 (September 2024)

A&A, 689 (2024) A47

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Table 1

Results of the spectral fitting of the two persistent spectra with similar bolometric flux in Figure 4 by combining the NICER, ME, and HE spectra in the 1.0–50.0 keV range with constant*tbabs*(diskbb+Nthcomp).

Time MJD	kT_in (keV)	R_in (km)	Γ	kT_e (keV)	$χ_{v}^{2}$ $\[\chi_v^2\]$	F_bol (10⁻⁹ erg/cm²/s)
59738.97058	${0.51}_{- 0.01}^{+ 0.02}$ $\[0.51_{-0.01}^{+0.02}\]$	${21.2}_{- 1.4}^{+ 0.8}$ $\[21.2_{-1.4}^{+0.8}\]$	${1.90}_{- 0.02}^{+ 0.05}$ $\[1.90_{-0.02}^{+0.05}\]$	${11.05}_{- 1.52}^{+ 3.36}$ $\[11.05_{-1.52}^{+3.36}\]$	190.64/202	${11.730}_{- 0.189}^{+ 0.204}$ $\[11.730_{-0.189}^{+0.204}\]$

59741.62791	${0.65}_{- 0.01}^{+ 0.01}$ $\[0.65_{-0.01}^{+0.01}\]$	${15.9}_{- 0.3}^{+ 0.3}$ $\[15.9_{-0.3}^{+0.3}\]$	${2.02}_{- 0.01}^{+ 0.03}$ $\[2.02_{-0.01}^{+0.03}\]$	${8.56}_{- 0.46}^{+ 0.40}$ $\[8.56_{-0.46}^{+0.40}\]$	231.46/231	${11.826}_{- 0.103}^{+ 0.112}$ $\[11.826_{-0.103}^{+0.112}\]$

Notes. For more details on the fitting of the persistent spectrum, see Chen et al. (2022). R_in is the inner radius of disk, defined as $R_{in} = {(\frac{N D_{10}^{2}}{\cos (i)})}^{1 / 2}$ $\[R_{\text {in }}=\left(\frac{N D_{10}^2}{\cos (i)}\right)^{1 / 2}\]$ , where N is the diskbb normalization, i is the viewing angle, D₁₀ is the distance D divided by 10 kpc. For this plot, we assumed D = 6.3 kpc and i = 45° (Chen et al. 2022).

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