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

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Table 1.

Properties of the target from 4XMM-DR9.

Target	RA	Dec	Error	^(⋆)	b	Flux ^(†)	HR₁^(‡)	HR₂^(‡)	HR₃^(‡)
4XMM	(°)	(°)	(″)	(cm⁻²)	(°)
J022141.5 − 735632	35.42309	−73.94223	0.9	1.41 × 10²¹	−41.7	9.8(6)	−0.663(21)	−0.91(4)	−0.95(24)

Notes.

^(⋆)

Total hydrogen column density in the line-of-sight (HI4PI Collaboration 2016).

^(†)

The catalogued EPIC flux is in units of 10⁻¹⁴ erg s⁻¹ cm⁻² in the 0.2 − 12 keV energy band.

^(‡)

Hardness ratios (HR) are ratios of the difference to total counts in the five XMM-Newton energy bands, 0.2 − 0.5 keV, 0.5 − 1 keV, 1 − 2 keV, 2 − 4.5 keV, and 4.5 − 12 keV. The source signal is undefined in HR₄.

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