High-velocity X-ray sources J/MNRAS/546/G058 ivo://CDS.VizieR/J/MNRAS/546/G058 CDS Zhao Y. Gandhi P. Knigge C. Charles P.A Stern D. Boorman P.,Nuchvanichakul P. Dashwood Brown C. Buckley D.A.H. 2026-04-02T06:28:33Z 2026-03-18T08:13:50Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr x-ray-binary-stars x-ray-sources We perform a comprehensive search for high-velocity X-ray sources with large X-ray/optical flux ratios (F_X_/F_G_), identifying candidates for interacting black hole or neutron star binaries potentially accelerated by supernova natal kicks. We cross-match X-ray points sources from a variety of catalogues (Chandra, XMM-Newton, Swift and eROSITA) with Gaia DR3. Using Gaia coordinates, parallaxes, and proper motions, we compute peculiar velocities (vpec) relative to Galactic disc rotation. Remaining agnostic about radial velocities (RVs), we vary RVs to find the minimum possible vpec values (vpec_min_). Uncertainties on vpec_min_ are estimated via Monte Carlo resampling, and we select X-ray sources that have 1 sigma lower limits on vpec_min_>=200km/s and high F_X/F_G values. We show that this velocity threshold excludes most contaminants (e.g., cataclysmic variables and active binaries) while retaining a sensible fraction of compact object binaries, demonstrating that vpec could serve as an effective indicator for the presence of a neutron star or black hole companion. Our selection yields a sample of 2372 sources, from which we construct a gold sample of 7 sources that have relatively well-constrained astrometry and confident optical counterparts. Follow-up is necessary to confirm and characterise their high-energy emission, as well as a Galactic disc vs. halo origin. 2026MNRAS.546ag058Z https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/546/G058 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022) I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021) IX/70 : Chandra Source Catalog Release 2 (CSC 2.1) (Evans+, 2024) IX/59 : XMM-Newton Serendipitous Source Catalogue 4XMM-DR9 (Webb+, 2020) IX/58 : 2SXPS Swift X-ray telescope point source catalogue (Evans+, 2020) J/A+A/682/A34 : SRG/eROSITA all-sky survey catalogs (eRASS1) (Merloni+, 2024) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/546/G058 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/546/G058 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/546/G058 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/546/G058 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/546/G058 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/546/G058 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/546/G058/hvxs (High-velocity X-ray sources (Sect 2.9)) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/546/G058/hvxs? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/546/G058/hvxs? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/546/G058/hvxs? 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https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/546/G058?format=ascii X-ray default J/MNRAS/546/G058/hvxs High-velocity X-ray sources (Sect 2.9) recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name X-ray designation meta.id;meta.main char GaiaDR3 Gaia source_id meta.id char RA_ICRS X-ray right ascension (ICRS) deg pos.eq.ra;meta.main DE_ICRS X-ray declination (ICRS) deg pos.eq.dec;meta.main RAGdeg Gaia right ascension (ICRS) at Ep=2016.0 deg pos.eq.ra DEGdeg Gaia declination (ICRS) at Ep=2016.0 deg pos.eq.dec Sep X-ray/Gaia angular separation arcsec pos.angDistance double PosErr X-ray error radius (1 Mahalanobis radius) arcsec stat.error;phys.angSize float Dist Distance used for computing velocities kpc pos.distance double e_Dist 1-sigma lower uncertainty on Dist kpc stat.error double E_Dist 1-sigma upper uncertainty on Dist kpc stat.error;stat.max double FX X-ray flux mW.m**-2 phot.flux;em.X-ray double e_FX Uncertainty on FX mW.m**-2 stat.error double Gmag Gaia G-band magnitude phot.mag;em.opt double BP-RP Gaia Bp-Rp colour phot.color;em.opt.B;em.opt.R double FX-FG X-ray/Gaia G band flux ratio phot.flux;arith.ratio double e_FX-FG Uncertainty on FX-FG stat.error double gamma-min Systemic RV corresponding to vpec-min km/s phys.veloc;stat.min double e_gamma-min 1-sigma lower uncertainty on gamma-min km/s stat.error float E_gamma-min 1-sigma upper uncertainty on gamma-min km/s stat.error;stat.max float vpec-min Minimum peculiar velocity km/s phys.veloc;stat.min double e_vpec-min 1-sigma lower uncertainty on vpec-min km/s stat.error double E_vpec-min 1-sigma upper uncertainty on vpec-min km/s stat.error;stat.max double Quality [01234567] Quality flag (see Sect 2.10) (1) meta.code.qual char