Table 2
Multi-wavelength properties of the UCDs and UCD candidates identified as bonafide or plausible counterparts to an eRASS1 X-ray source.
| Gaia DR2 designation of UCD | G (mag) | J (mag) | W1 (mag) | SpTspec | SpTG−J | d (pc) | log Lx (erg s−1) | log(Lx /Lbol) | Young flag | Young ref | Binary flag | Binary ref |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| GagnéM | ||||||||||||
| 659464504288593536 | 15.02 | 11.05 | 9.80 | M6 | M6−M6.5V |  |
27.21 | −3.33 | … | … | … | … |
| 666988221840703232 | 14.77 | 10.88 | 9.61 | M7 | M6−M6.5V |  |
28.07 | −2.51 | Y | 5,6 | … | … |
| 703790044252850688 | 12.19 | 8.24 | 6.95 | M6.5 | M6−M6.5V |  |
26.83 | −3.72 | … | … | … | … |
| 908963788782045568 | 19.23 | 15.57 | 14.27 | M6 | M5.5−M6V |  |
28.94 | −1.78 | … | … | … | … |
| 3181197137010596608 | 12.22 | 8.14 | 7.11 | M5 + M6 | M7V |  |
28.73 | −1.71 | Y | 5,6 | Y | 1,13 |
| 3200303384927512960 | 14.93 | 10.66 | 9.36 | M6.5 | M7−M7.5V |  |
26.96 | −3.41 | Y | 5,6 | … | … |
| 3830128624846458752 | 16.55 | 12.33 | 11.04 | M7 | M7−M7.5V |  |
27.52 | −2.87 | … | … | … | … |
Notes. The full table is available at the CDS.
References. (1) Mason et al. (2001), (5) Shkolnik et al. (2009), (6) Shkolnik et al. (2012), (13) Winters et al. (2019).
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