Double-hump spectrum, pulse profile dip, and pulsed fraction spectra from the low-accretion regime in the X-ray pulsar MAXI J0655-013

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Table 2.

Best-fit parameters of MAXI J0655 data from XMM-Newton+NuSTAR observations for two different spectral models.

Model	CompTT + CompTT
Component	Thermal Compt.	Hot Compt.
N_H [10²² cm⁻²]	$0 . 34_{- 0.03}^{+ 0.03}$ $0.34^{+0.03}_{-0.03}$
T₀ [keV]	$0 . 78_{- 0.07}^{+ 0.06}$ $0.78^{+0.06}_{-0.07}$
kT [keV]	$1 . 8_{- 0.2}^{+ 0.4}$ $1.8^{+0.4}_{-0.2}$	$21 . 5_{- 11.0}^{★}$ $21.5_{-11.0}^{\star}$
τ_p	$8 . 5_{- 1.9}^{+ 2.3}$ $8.5^{+2.3}_{-1.9}$	$2 . 8_{- 2.1}^{+ 3.6}$ $2.8^{+3.6}_{-2.1}$
Flux^†	$2 . 7_{- 0.3}^{+ 0.5}$ $2.7^{+0.5}_{-0.3}$	$2 . 7_{- 0.4}^{+ 0.4}$ $2.7^{+0.4}_{-0.4}$
χ_d.o.f.²	491/478

Model	CompTT * gabs
Component	Comptonization	Absorption line
N_H [10²² cm⁻²]	$0 . 41_{- 0.03}^{+ 0.03}$ $0.41^{+0.03}_{-0.03}$
T₀ [keV]	$0 . 88_{- 0.02}^{+ 0.02}$ $0.88^{+0.02}_{-0.02}$	–
kT [keV]	$30_{- 17}^{+ 63}$ $30^{+63}_{-17}$	–
τ_p	$0 . 8_{- 0.5}^{+ 4.2}$ $0.8^{+4.2}_{-0.5}$	–
E_Gauss [keV]	–	$18 . 3_{- 1.1}^{+ 1.2}$ $18.3^{+1.2}_{-1.1}$
σ_Gauss [keV]	–	$6 . 4_{- 1.2}^{+ 1.6}$ $6.4^{+1.6}_{-1.2}$
d_Gauss [keV]	–	$11 . 8_{- 4.6}^{+ 6.8}$ $11.8^{+6.8}_{-4.6}$
Flux^†	$3 . 73_{- 0.05}^{+ 0.05}$ $3.73^{+0.05}_{-0.05}$
χ²/d.o.f.	491/466

Notes. All errors are reported at 1σ c.l. ^★Upper limit unconstrained. ^†Unabsorbed flux values calculated separately for each of the CompTT components in the 0.5 − 100 keV band and reported in units of 10⁻¹² erg cm⁻² s⁻¹. Flux values with estimated errors were derived using the cflux model from XSPEC as obtained from the XMM-Newton pn instrument.

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