XMM-Newton and SRG/eROSITA observations of the isolated neutron star candidate 4XMM J022141.5−735632

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Volume 666 (October 2022)

A&A, 666 (2022) A148

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Table 4.

Results of spectral fitting.

	NHP^a	C (d.o.f.)	N_H^b	Model parameters

`bbodyrad`				kT	R_em^d
				(eV)	(km)
1	57	162 (159)		60.2(1.7)
2^(⋆)	72	141 (157)
3^(†)	73	141 (157)
4	49	157 (151)		62(4)	11(4)

`nsa`^e				T_eff	d
				(10⁵ K)	(pc)

5	27	175 (156)
6	63	155 (156)
7	63	155 (156)	10.4(9)	3.00(15)

Notes. Errors are 1σ confidence levels. Models fitted to the data: (1) single- and (2) double-temperature blackbody; (3) blackbody plus power-law tail, (4) “variable” single-temperature blackbody; (5) non-magnetised neutron star atmosphere, and neutron star atmosphere with magnetic field intensities (6) 10¹² G and (7) 10¹³ G.

^(a)

Null-hypothesis probability in percentage that the data are drawn from the model.

^(b)

The column density is in units of 10²⁰ cm⁻².

^(c)

The unabsorbed flux is in units of 10⁻¹³ erg s⁻¹ cm⁻² (0.2 − 12 keV).

^(d)

The blackbody emission radius at infinity is computed assuming a distance of 1 kpc.

^(e)

The nsa models assume canonical neutron star mass and radius, 1.4 M_⊙ and 10 km.

^(⋆)

Parameters of the best-fit second blackbody component: eV and km.

^(†)

Parameters of the power-law tail: photon index and observed flux erg s⁻¹ cm⁻² (0.2 − 2 keV).

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