Detection of pulsed X-ray emission from the isolated neutron star candidate eRASSU J131716.9–402647

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Volume 683 (March 2024)

A&A, 683 (2024) A164

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Table 4.

X-ray spectrum fitting results.

`BB`

	N_H	kT	Radius ^(a)	ϵ₁	σ₁	EW₁^(b)	ϵ₂	σ₂	EW₂^(b)		Absorbed flux ^(c)
	[10²⁰ cm⁻²]	[eV]	[km]	[eV]	[eV]	[eV]	[eV]	[eV]	[eV]		[10⁻¹³ erg s⁻¹ cm⁻²]
pn		86.7 ± 1.6								4.09(26)	4.63(5)
pn	12(5)									1.69(23)	4.78(5)
pn	< 5									1.04(20)	4.88(5)
pn	< 2				150			15		0.95(22)	4.87(5)
All		83.2 ± 1.1								1.34(910)	4.66(3)
All				< 260						1.07(907)	5.14(4)
All		88.6 ± 2.0		< 240				< 43		1.06(904)	5.06(4)

`PL`

	N_H	Γ		ϵ	σ	EW ^(b)					Absorbed flux ^(c)
	[10²⁰ cm⁻²]			[eV]	[eV]	[eV]					[10⁻¹³ erg s⁻¹ cm⁻²]

pn										17.27(26)	4.42(5)
pn		9.5(4)								0.86(23)	4.77(5)

`NSA`^(d)

	N_H	kT	B	ϵ₁	σ₁	EW₁^(b)	ϵ₂	σ₂	EW₂^(b)		Absorbed flux ^(c)
	[10²⁰ cm⁻²]	[eV]	[G]	[eV]	[eV]	[eV]	[eV]	[eV]	[eV]		[10⁻¹³ erg s⁻¹ cm⁻²]

pn		20.53(19)	0							5.52(26)	4.58(5)
pn			0		146(5)					2.18(23)	4.77(5)
pn	< 1.7		0							1.39(20)	4.89(5)
pn			10¹²							7.05(26)	4.57(5)
pn			10¹²							1.41(23)	4.77(5)
pn	< 9		10¹²	< 370				< 50		0.77(20)	4.88(5)
pn			10¹³							7.07(26)	4.56(5)
pn	15(5)		10¹³							1.30(23)	4.78(5)
pn	< 9		10¹³	< 350			591(8)	< 50		0.71(20)	4.89(5)

`2BBGABS`

	N_H	kT₁	Radius₁^(a)	kT₂	Radius₂^(a)		ϵ	σ	EW ^(b)		Absorbed flux ^(c)
	[10²⁰ cm⁻²]	[eV]	[km]	[eV]	[km]		[eV]	[eV]	[eV]		[10⁻¹³ erg s⁻¹ cm⁻²]

pn							< 400			1.02(21)	4.77(5)

`BBPLGABS`

	N_H	kT	Radius ^(a)	Γ			ϵ	σ	EW ^(b)		Absorbed flux ^(c)
	[10²⁰ cm⁻²]	[eV]	[km]				[eV]	[eV]	[eV]		[10⁻¹³ erg s⁻¹ cm⁻²]

pn							< 330			0.87(21)	4.78(5)

Notes. We give the 1σ confidence intervals for the estimated parameters.

^(a)

We assumed a 1 kpc distance for the blackbody emission radius at infinity.

^(b)

The equivalent width (EW) was estimated via , with F_c being the continuum and F_o the observed flux. The errors state the maximum and minimum EW values obtained from all possible combinations of the upper and lower 1σ confidence interval limits of the model parameters.

^(c)

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

^(d)

The model parameters assume a canonical neutron star with 1.4 M_⊙ and 12 km radius.

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