Identifying the 3FHL Catalog. VI. Swift Observations of 3FHL Unassociated Objects with Source Classification via Machine Learning

Abstract The Third Catalog of Hard Fermi Large Area Telescope Sources (3FHL) reports the detection 1556 objects at E > 10 GeV. However, 177 sources remain unassociated and 23 are associated with a ROSAT X-ray unknown origin. Pointed observations were conducted on 30 these Swift−XRT. A bright source counterpart was detected in 21 out fields. In five fields, we more than one counterpart, totaling 26 analyzed. Multiwavelength data compiled for each detected. We find that display multiwavelength properties blazars, while displays characteristics Galactic source. Using trained decision tree, random forest, support vector machine models, predict all blazar candidates to be BL Lacertae (BL Lacs). This is agreement Lacs being most populous class 3FHL.