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We present the first public data release of the VISTA EXtension to AuxiliarySurveys (VEXAS), comprising of 9 cross-matched multi-wavelength photometriccatalogs where each object has a match in at least two surveys. We aim at aspatial coverage as uniform as possible in the multi-wavelength sky, with thepurpose of providing the astronomical community with reference magnitudes andcolours for various scientific uses, including: object classification (e.g.quasars, galaxies, and stars; high-z galaxies, white dwarfs, etc.); photometricredshifts of large galaxy samples; searches of exotic objects such as, forexample, extremely red objects and lensed quasars. We have cross-matched thewide-field VISTA catalogs (the VISTA Hemisphere Survey and the VISTA KiloDegree Infrared Galaxy Survey) with the AllWISE mid-infrared Survey, requiringthat a match exists within 10 arcsec. We have further matched this table withX-Ray and radio data (ROSAT, XMM, SUMSS). We also performed a secondcross-match between VISTA and AllWISE, with a smaller matching radius (3"),including WISE magnitudes. We have then cross-matched this resulting table($\approx138\times10^6$ objects) with three photometric wide-sky optical deepsurveys (DES, SkyMapper, PanSTARRS). We finally include matches to objects withspectroscopic follow-up by the SDSS and 6dFGS. To demonstrate the power ofall-sky multi-wavelength cross-match tables, we show two examples of scientificapplications of VEXAS, in particular using the publicly released tables todiscover strong gravitational lenses (beyond the reach of previous searches),and to build a statistically large sample of extremely red objects. The VEXAScatalog is currently the widest and deepest, public, optical-to-IR photometricand spectroscopic database in the Southern Hemisphere.

VEXAS: the VISTA EXtension to Auxiliary Surveys -- Data Release 1: the Southern Galactic Hemisphere