Table A.2.
Six objects with different counterpart identification presented in this work and with NWAY (Salvato et al., in prep.). Given are the IAU name, the CV name, its type, the Gaia DR3 ID of the counterpart chosen in this work, the G-band magnitude, the implied distance and the positional offset between the Gaia and the 1eRASS source, the Gaia DR3 ID of the counterpart chosen by NWAY, its G-band magnitude, parallax, the positional offset, and the final likely identification.
IAUNAME | CVName | Type | GaiaID_CV | G | Dist. | Δx | GaiaID_NWAY | G | π | Δx | Counterpart |
---|---|---|---|---|---|---|---|---|---|---|---|
(mag) | (pc) | (″) | (mag) | (mas) | (″) | ||||||
1eRASS J054320.2-410154 | TX Col | IP | 4804695427734393472 | 15.61 | 909 | 2.0 | 4804695423438691200 | 15.13 | 1.02 | 0.6 | CV |
1eRASS J061145.8-814921 | AH Men | CBcat NL | 5207385651533430912 | 13.78 | 491 | 4.4 | 5207384891323130368 | 13.48 | 2.04 | 2.6 | CV |
1eRASS J101545.8+033318 | J1015+0333 | CBcat DN | 3859948269249864832 | 17.76 | 1641 | 7.4 | 3859948273545278336 | 20.4 | — | 6.5 | CV (+ ?) |
1eRASS J131223.5+173658 | 2XMM J1312 | Polar | 3937217307886601088 | 19.53 | 830 | 1.8 | 3937217307885385728 | 19.5 | −0.2 | 3.9 | CV |
1eRASS J131559.7-370018 | CD-36 8436 | SySts | 6165818495673620352 | 9.8 | 2260 | 21.1 | 6165817018204434816 | 11.4 | 3.12 | 2.4 | star (?) |
1eRASS J132558.4-145223 | ZTF19abdsnjm | AM CVn | 3608015074033774336 | 20.4 | 1160 | 5.9 | 3608015074033776768 | 18.4 | 0.0 | 8.4 | CV (+ ?) |
Notes for individual objects: 1) TX Col, an IP, which are notorious and bright X-ray emitters. X-ray source in HEAO, Swift, 1RXS. Secure CV identification 2) AH Men: this NL CV is listed as H, RXS, Swift source. Secure CV identification 3) J1015+0333: the NWAY ctp is faint, at same positional offset as the CV, not labeled as extra-galactic. The implied high fX/fopt excludes a coronal emitter as X-ray source. Implied optical/X-ray properties typical of a DN. Contribution by background AGN not completely excluded but unlikely. 4) 2XMM J1312: Vogel et al. (2008) identified the eclipsing polar as counterpart to the X-ray source. They also presented a spectrum of the AGN chosen by NWAY as the likely counterpart, but the periodic modulation of the X-ray signal by 100% excludes any significant contribution of the AGN to the measured X-ray signal. 5) CD-36 8436: It is an optically bright SySts, the positional offset of our proposed optical counterpart is rather large. The X-ray position is confirmed from the living Swift/XRT catalog. Both NWAY and the HamStars code (Freund et al. 2024) select a positionally better matching Gaia object as likely counterpart, a stellar coronal emitter. A possible or even likely CV mismatch. 6) ZTF19abdsnjm: The chosen counterpart by NWAY is brighter (but still implying a high X-ray to optical flux ratio), at larger positional offset, and flagged as extragalactic. While the implied the optical and X-ray properties are reasonable for a CV identification, a contribution from a background AGN cannot be excluded.
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