A first eROSITA view of ultracool dwarfs | Astronomy & Astrophysics (A&A)

The Early Data Release of eROSITA and Mikhail Pavlinsky ART-XC on the SRG mission

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Table 1

Basic X-ray parameters from eRASS1cat for the UCDs from GagnéM and UCD candidates from Reylé (2018) that are within 3× the uncertainty of the X-ray position.

Gaia DR2 designation	RA_CORR (deg)	DEC_CORR (deg)	delta_radec (″)	sep ox (″)	Count rate (ctss⁻¹)	DETML	Flags^(a)	UCD^(b)
GagnéM

4963614887043956096	34.842070	−39.423258	4.63	2.32	0.064 ± 0.024	12.1		P
5084713036143375744	54.130367	−26.333831	2.61	5.16	0.164 ± 0.031	80.1	U	B
4869246209213679872	65.587646	−36.102014	2.56	1.84	0.12 ± 0.023	67.6	U	B
3200303384927512960	70.097406	−5.501610	4.0	5.28	0.109 ± 0.032	24.7	UX	B
3181197137010596608	71.715048	−11.280513	0.96	1.09	1.683 ± 0.128	1051.0	C	B
3164100487113671552	114.932856	13.080929	5.63	12.48	0.081 ± 0.038	10.2	C
666988221840703232	118.101611	16.201617	2.9	3.54	0.395 ± 0.081	63.7	UX	B

Notes. ^(a)Result from counterpart selection: U … UCD is uniq Gaia counterpart, C … common proper motion pair, X … archival X-ray detection. ^(b)Final counterpart status for the UCD: B … bona-fide, P … plausible. The full table is available at the CDS.

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