D'Abrusco, RaffaeleRaffaeleD'AbruscoÁlvarez Crespo, NuriaNuriaÁlvarez CrespoMASSARO, FrancescoFrancescoMASSAROCAMPANA, RICCARDORICCARDOCAMPANAChavushyan, VahramVahramChavushyanLANDONI, MarcoMarcoLANDONILA FRANCA, FABIOFABIOLA FRANCAMASETTI, NICOLANICOLAMASETTIMilisavljevic, DanDanMilisavljevicPAGGI, AlessandroAlessandroPAGGIRICCI, FEDERICAFEDERICARICCISmith, Howard A.Howard A.Smith2020-11-302020-11-3020190067-0049http://hdl.handle.net/20.500.12386/28595We present two catalogs of radio-loud candidate blazars whose Wide-Field Infrared Survey Explorer (WISE) mid-infrared colors are selected to be consistent with the colors of confirmed γ-ray-emitting blazars. The first catalog is the improved and expanded release of the WISE Blazar-like Radio-Loud Sources (WIBRaLS) catalog presented by D’Abrusco et al. It includes sources detected in all four WISE filters, spatially cross-matched with radio sources in one of three radio surveys and radio-loud based on their q <SUB>22</SUB> spectral parameter. WIBRaLS2 includes 9541 sources classified as BL Lacs, flat-spectrum radio quasars, or mixed candidates based on their WISE colors. The second catalog, called KDEBLLACS, based on a new selection technique, contains 5579 candidate BL Lacs extracted from the population of WISE sources detected in the first three WISE passbands ([3.4], [4.6], and [12]) only, whose mid-infrared colors are similar to those of confirmed, γ-ray BL Lacs. Members of KDBLLACS are also required to have a radio counterpart and be radio-loud based on the parameter q <SUB>12</SUB>, defined similarly to the q <SUB>22</SUB> used for the WIBRaLS2. We describe the properties of these catalogs and compare them with the largest samples of confirmed and candidate blazars in the literature. We cross-match the two new catalogs with the most recent catalogs of γ-ray sources detected by the Fermi Large Area Telescope. Since spectroscopic observations of candidate blazars from the first WIBRaLS catalog within the uncertainty regions of γ-ray unassociated sources confirmed that ∼90% of these candidates are blazars, we anticipate that these new catalogs will again play an important role in the identification of the γ-ray sky.STAMPAenArticle10.3847/1538-4365/ab16f42-s2.0-85068834095000467463500001https://iopscience.iop.org/issue/0067-0049/242/12019ApJS..242....4DFIS/05 - ASTRONOMIA E ASTROFISICA