Open Access

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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