Transitions in magnetic behavior at the substellar boundary

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Table 6

Best-fit X-ray spectral parameters for the five UCDs with net counts >200 detected with XMM-Newton and for the only object that shows two eROSITA detections with net counts >30.

Other_Name	kT₁	log(EM₁)	kT₂	log(EM₂)	$χ_{red}^{2}$ $\chi _{{\rm{red }}}^2$	d.o.f.	〈kT_corona〉
	(keV)	(cm⁻³)	(keV)	(cm⁻³)			(keV)
XMM-Newton: Sect. 3.1.1

2MJ0752	0.22±0.09	50.58±0.20	0.86±0.15	50.67±0.12	0.65	19	0.57±0.09
2MJ0351	0.28±0.05	49.57±0.11	1.08±0.29	49.33±0.16	1.25	25	0.58±0.11
2MJ0440	0.15±0.06	49.78±0.24	0.75±0.09	49.79±0.08	1.94	13	0.46±0.06
2MJ0838	0.22±0.07	49.40±0.18	1.12±0.18	49.58±0.11	0.85	21	0.77±0.11
2MJ0435	0.17±0.10	49.38±0.18	0.84±0.25	49.37±0.12	1.48	19	0.50±0.13

eROSITA: Sect. 3.1.2

2MJ0752 (eRASS01)	0.48±0.28	51.06±0.28	…	…	0.22	2	0.48±0.28
2MJ0752 (eRASS03)	0.81±0.22	51.18±0.13	…	…	0.58	6	0.81±0.22

Notes. The best-fit parameters refer to the 0.2–2.0 keV energy band.

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