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Fast access to large catalogs is required for some astronomical applications.Here we introduce the catsHTM tool, consisting of several large catalogsreformatted into HDF5-based file format, which can be downloaded and usedlocally. To allow fast access, the catalogs are partitioned into hierarchicaltriangular meshes and stored in HDF5 files. Several tools are provided toperform efficient cone searches at resolutions spanning from a few arc secondsto degrees, within a few milliseconds time. The first released version includesthe following catalogs (by alphabetical order): 2MASS, 2MASS extended sources,AKARI, APASS, Cosmos, DECaLS/DR5, FIRST, GAIA/DR1, GAIA/DR2, GALEX/DR6Plus7,HSC/v2, IPHAS/DR2, NED redshifts, NVSS, Pan-STARRS1/DR1, PTF photometriccatalog, ROSAT faint source, SDSS sources, SDSS/DR14 spectroscopy,Spitzer/SAGE, Spitzer/IRAC galactic center, UCAC4, UKIDSS/DR10, VST/ATLAS/DR3,VST/KiDS/DR3, WISE and XMM. We provide Python code that allows to perform conesearches, as well as MATLAB code for performing cone searches, catalogcross-matching, general searches, as well as load and create these catalogs.

catsHTM - A tool for fast accessing and cross-matching large astronomical catalogs