A multi-wavelength view of the isolated neutron star eRASSU J065715.3+260428

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Volume 694 (February 2025)

A&A, 694 (2025) A160

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Table 4.

Results of the phase-integrated X-ray spectral analysis.

EPIC pn (`BB`, `PL`)
	N_H	kT₁	R₁^(a)	kT₂	R₂^(a)	α	ϵ^(b)	σ	EW^(c)	χ_ν²(ν)	Absorbed flux ^(d)
	[10²⁰ cm⁻²]	[eV]	[km]	[eV]	[km]		[eV]	[km]/[eV]	[eV]		[10⁻¹³ erg s⁻¹ cm⁻²]
I	$1 . 8_{- 0.5}^{+ 0.5}$ $1.8^{+0.5}_{-0.5}$	$122 . 3_{- 2.2}^{+ 2.3}$ $122.3^{+2.3}_{-2.2}$	$1 . 2_{- 0.08}^{+ 0.08}$ $1.2^{+0.08}_{-0.08}$							5.29(42)	$2 . 44_{- 0.04}^{+ 0.04}$ $2.44^{+0.04}_{-0.04}$
II	$7 . 1_{- 1.0}^{+ 1.1}$ $7.1^{+1.1}_{-1.0}$	$88_{- 4}^{+ 4}$ $88^{+4}_{-4}$	$3 . 3_{- 0.5}^{+ 0.8}$ $3.3^{+0.8}_{-0.5}$	$219_{- 13}^{+ 15}$ $219^{+15}_{-13}$	$0 . 18_{- 0.04}^{+ 0.05}$ $0.18^{+0.05}_{-0.04}$					1.22(40)	$2 . 41_{- 0.03}^{+ 0.03}$ $2.41^{+0.03}_{-0.03}$
III	< 5	$93_{- 7}^{+ 6}$ $93^{+6}_{-7}$	$2 . 2_{- 0.4}^{+ 0.6}$ $2.2^{+0.6}_{-0.4}$	$222_{- 15}^{+ 17}$ $222^{+17}_{-15}$	$0 . 16_{- 0.04}^{+ 0.05}$ $0.16^{+0.05}_{-0.04}$		$306_{- 24}^{+ 50}$ $306^{+50}_{-24}$	$51_{- 40}^{+ 19}$ $51^{+19}_{-40}$	$120_{- 100}^{+ 80}$ $120^{+80}_{-100}$	1.08(37)	$2 . 57_{- 0.04}^{+ 0.04}$ $2.57^{+0.04}_{-0.04}$
IV	$15 . 7_{- 0.9}^{+ 0.9}$ $15.7^{+0.9}_{-0.9}$					$5 . 05_{- 0.10}^{+ 0.10}$ $5.05_{-0.10}^{+0.10}$				1.35(42)	$2 . 377_{- 0.029}^{+ 0.029}$ $2.377^{+0.029}_{-0.029}$
V	$12 . 8_{- 1.6}^{+ 1.7}$ $12.8^{+1.7}_{-1.6}$	$88_{- 9}^{+ 9}$ $88^{+9}_{-9}$	$2 . 1_{- 0.7}^{+ 1.0}$ $2.1^{+1.0}_{-0.7}$			$4 . 63_{- 0.25}^{+ 0.24}$ $4.63^{+0.24}_{-0.25}$				1.32(40)	$2 . 41_{- 0.03}^{+ 0.03}$ $2.41^{+0.03}_{-0.03}$
VI	$9 . 7_{- 4}^{+ 2.4}$ $9.7^{+2.4}_{-4}$					$4 . 77_{- 0.18}^{+ 0.15}$ $4.77^{+0.15}_{-0.18}$	$350_{- 50}^{+ 40}$ $350^{+40}_{-50}$	$53_{- 30}^{+ 29}$ $53^{+29}_{-30}$	$80_{- 50}^{+ 100}$ $80^{+100}_{-50}$	1.06(39)	$2 . 47_{- 0.04}^{+ 0.04}$ $2.47^{+0.04}_{-0.04}$
VII	< 11	$170_{- 70}^{+ 50}$ $170^{+50}_{-70}$	$0 . 2_{- 0.11}^{+ 1.1}$ $0.2^{+1.1}_{-0.11}$			$4 . 6_{- 0.4}^{+ 0.5}$ $4.6^{+0.5}_{-0.4}$	$290_{- 70}^{+ 70}$ $290^{+70}_{-70}$	$80_{- 40}^{+ 40}$ $80^{+40}_{-40}$	$200_{- 140}^{+ 200}$ $200^{+200}_{-140}$	1.08(37)	$2 . 55_{- 0.04}^{+ 0.04}$ $2.55^{+0.04}_{-0.04}$
EPIC pn (`NSA`) ^(e)
	N_H	log(T)	d	kT	R_BB^(f)	α	ϵ₁	σ₁	EW^(b)	χ_ν²(ν)	Absorbed flux ^(c)
	[10²⁰ cm⁻²]	[log(K)]	[kpc]	[eV]	[km]		[eV]	[eV]	[eV]		[10⁻¹³ erg s⁻¹ cm⁻²]

VIII	${5.2}_{- 0.6}^{+ 0.6}$ ${5.2}_{-0.6}^{+0.6}$	${5.873}_{- 0.014}^{+ 0.013}$ ${5.873}_{-0.014}^{+0.013}$	${1.56}_{- 0.16}^{+ 0.16}$ ${1.56}_{-0.16}^{+0.16}$							3.17(42)	${2.41}_{- 0.03}^{+ 0.03}$ ${2.41}_{-0.03}^{+0.03}$
IX	< 11	${6.04}_{- 0.23}^{+ 0.14}$ ${6.04}_{-0.23}^{+0.14}$	$11_{- 7}^{+ 7}$ ${11}_{-7}^{+7}$			${4.6}_{- 0.5}^{+ 0.6}$ ${4.6}_{-0.5}^{+0.6}$	$280_{- 60}^{+ 70}$ ${280}_{-60}^{+70}$	$80_{- 40}^{+ 29}$ ${80}_{-40}^{+29}$	$220_{- 150}^{+ 130}$ $220^{+130}_{-150}$	1.07(37)	${2.58}_{- 0.04}^{+ 0.04}$ ${2.58}_{-0.04}^{+0.04}$
X	< 8	${5.75}_{- 0.06}^{+ 0.07}$ ${5.75}_{-0.06}^{+0.07}$	${0.7}_{- 0.4}^{+ 0.4}$ ${0.7}_{-0.4}^{+0.4}$	$246_{- 22}^{+ 40}$ ${246}_{-22}^{+40}$	${0.08}_{- 0.06}^{+ 0.12}$ ${0.08}_{-0.06}^{+0.12}$		$320_{- 50}^{+ 50}$ ${320}_{-50}^{+50}$	$50_{- 40}^{+ 25}$ ${50}_{-40}^{+25}$	$110_{- 80}^{+ 110}$ $110^{+110}_{-80}$	1.04(37)	${2.52}_{- 0.04}^{+ 0.04}$ ${2.52}_{-0.04}^{+0.04}$

All instruments

	N_H	kT₁	R₁^(a)	kT₂	R₂^(a)		ϵ	σ	EW^(b)	χ_ν²(ν)	Absorbed flux ^(c)
	[10²⁰ cm⁻²]	[eV]	[km]	[eV]	[km]		[eV]	[eV]	[eV]		[10⁻¹³ erg s⁻¹ cm⁻²]

XI	< 4	$97_{- 6}^{+ 4}$ $97^{+4}_{-6}$	$1 . 97_{- 0.028}^{+ 0.8}$ $1.97^{+0.8}_{-0.028}$	$228_{- 14}^{+ 15}$ $228^{+15}_{-14}$	$0 . 148_{- 0.027}^{+ 0.04}$ $0.148^{+0.04}_{-0.027}$		$289_{- 25}^{+ 50}$ $289^{+50}_{-25}$	$58_{- 27}^{+ 17}$ $58^{+17}_{-27}$	$130_{- 90}^{+ 70}$ $130^{+70}_{-90}$	1.02(113)	$2 . 550_{- 0.028}^{+ 0.028}$ $2.550^{+0.028}_{-0.028}$
XII	< 1.1	$101_{- 5}^{+ 4}$ $101^{+4}_{-5}$	$1 . 92_{- 0.13}^{+ 0.21}$ $1.92^{+0.21}_{-0.13}$	$247_{- 18}^{+ 19}$ $247^{+19}_{-18}$	$0 . 122_{- 0.025}^{+ 0.04}$ $0.122^{+0.04}_{-0.025}$		$285_{- 50}^{+ 17}$ $285^{+17}_{-50}$	$60_{- 17}^{+ 26}$ $60^{+26}_{-17}$	$130_{- 50}^{+ 100}$ $130^{+100}_{-50}$	1.02(1086)	$2 . 696_{- 0.022}^{+ 0.022}$ $2.696^{+0.022}_{-0.022}$

Notes. We provide 1σ confidence intervals on the best-fit parameters.

^(a)

For the blackbody emission radius at infinity, we assumed a source at a distance of 1 kpc.

^(b)

Central line energy of the Gaussian absorption component.

^(c)

The equivalent width (EW) is estimated from $\int \frac{f_{c} - f_{o}}{f_{c}} d E$ $\int \frac{f_c-f_o}{f_c} dE$ , with f_c being the continuum and f_o the observed flux. Errors provide the maximum and minimum EW values obtained from all possible combinations of the upper and lower 1σ confidence interval limits of the model parameters.

^(d)

The absorbed model flux covers the 0.2 − 10 keV range.

^(e)

The model parameters assume a canonical neutron star with 1.4 M_⊙ and 12 km radius and a magnetic field strength of 10¹² G.

^(f)

The size of the emission region of the blackbody component in combination with the NSA model is computed for a source at the best-fit distance 700 pc.

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