A new pulsating neutron star in the ultraluminous X-ray source NGC 4559 X7?

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Table 3.

Best-fit spectral results.

Model 2	Component	#1	#2	#3	#4	#5	#6
TBABS	N_H (10²² cm⁻²)	${0.157}_{- 0.007}^{+ 0.007}$ ${0.157}_{-0.007}^{+0.007}$
DISKBB	kT_in (keV)	${0.262}_{- 0.009}^{+ 0.009}$ ${0.262}_{-0.009}^{+0.009}$	${0.247}_{- 0.009}^{+ 0.009}$ ${0.247}_{-0.009}^{+0.009}$	${0.232}_{- 0.009}^{+ 0.009}$ ${0.232}_{-0.009}^{+0.009}$	${0.210}_{- 0.009}^{+ 0.009}$ ${0.210}_{-0.009}^{+0.009}$	${0.20}_{- 0.01}^{+ 0.01}$ ${0.20}_{-0.01}^{+0.01}$	${0.0}_{0}^{+ 0.8}$ ${0.0}_{0}^{+0.8}$
DISKBB	norm	$22_{- 3}^{+ 4}$ ${22}_{-3}^{+4}$
DISKPBB	kT_in (keV)	${1.49}_{- 0.05}^{+ 0.05}$ ${1.49}_{-0.05}^{+0.05}$	${1.60}_{- 0.05}^{+ 0.05}$ ${1.60}_{-0.05}^{+0.05}$	${1.71}_{- 0.05}^{+ 0.06}$ ${1.71}_{-0.05}^{+0.06}$	${1.84}_{- 0.07}^{+ 0.07}$ ${1.84}_{-0.07}^{+0.07}$	${1.90}_{- 0.07}^{+ 0.07}$ ${1.90}_{-0.07}^{+0.07}$	${1.93}_{- 0.07}^{+ 0.07}$ ${1.93}_{-0.07}^{+0.07}$
DISKPBB	p	${0.535}_{- 0.008}^{+ 0.008}$ ${0.535}_{-0.008}^{+0.008}$
	norm	${0.0040}_{- 0.0006}^{+ 0.0007}$ ${0.0040}_{-0.0006}^{+0.0007}$
CUTOFFPL	norm (10⁻⁵)	< 100	< 100	< 100	${4.4}_{- 1.2}^{+ 1.1}$ ${4.4}_{-1.2}^{+1.1}$	${12.6}_{- 1.5}^{+ 1.5}$ ${12.6}_{-1.5}^{+1.5}$	${16.8}_{- 1.8}^{+ 1.7}$ ${16.8}_{-1.8}^{+1.7}$
	f_X^(a)	$6 . 18_{- 0.16}^{+ 0.17}$ $6.18_{-0.16}^{+0.17}$	$6 . 85_{- 0.19}^{+ 0.20}$ $6.85_{-0.19}^{+0.20}$	$7 . 72_{- 0.13}^{+ 0.13}$ $7.72_{-0.13}^{+0.13}$	$10 . 57_{- 0.13}^{+ 0.13}$ $10.57_{-0.13}^{+0.13}$	$13 . 24_{- 0.12}^{+ 0.13}$ $13.24_{-0.12}^{+0.13}$	$14 . 20_{- 0.13}^{+ 0.13}$ $14.20_{-0.13}^{+0.13}$
	f_cold^(a)	$1 . 99_{- 0.15}^{+ 0.15}$ $1.99_{-0.15}^{+0.15}$	$1 . 78_{- 0.07}^{+ 0.12}$ $1.78_{-0.07}^{+0.12}$	$1 . 54_{- 0.10}^{+ 0.10}$ $1.54_{-0.10}^{+0.10}$	$1 . 05_{- 0.13}^{+ 0.21}$ $1.05_{-0.13}^{+0.21}$	$0 . 91_{- 0.18}^{+ 0.27}$ $0.91_{-0.18}^{+0.27}$	< 0.01
	f_hot^(a)	$3 . 97_{- 1.11}^{+ 1.25}$ $3.97_{-1.11}^{+1.25}$	$3 . 93_{- 0.92}^{+ 1.05}$ $3.93_{-0.92}^{+1.05}$	$4 . 46_{- 1.04}^{+ 1.13}$ $4.46_{-1.04}^{+1.13}$	$7 . 87_{- 3.1}^{+ 1.7}$ $7.87_{-3.1}^{+1.7}$	$7 . 96_{- 2.17}^{+ 1.96}$ $7.96_{-2.17}^{+1.96}$	$10 . 67_{- 0.99}^{+ 0.78}$ $10.67_{-0.99}^{+0.78}$

	χ²/d.o.f.	4158.66/3789

Note. Best-fit spectral parameters for the TBABS(DISKBB + DISKPBB + CUTOFFPL) model (Model 2), when linking the normalisation parameters of the thermal components for all the spectra (Model 2). Errors are at 90% uncertainty for each parameter of interest.

^(a)

Unabsorbed fluxes of the full model (f_X), cold temperature (f_cold) and hard (f_hot) temperature thermal models, respectively, in the 0.001–30 keV energy band in units of 10⁻¹² erg cm⁻² s⁻¹.

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