Optical spectroscopic observations of gamma-ray blazar candidates. IX. Optical archival spectra and further observations from SOAR and OAGH

Pena-Herazo, HA; Massaro, F; Chavushyan, V; Marchesini, EJ; Paggi, A; Landoni, M; Masetti, N; Ricci, F; D'Abrusco, R; Milisavljevic, D; Jimenez-Bailon, E; La Franca, F; Smith, HA; Tosti, G

Pena-Herazo, HA (reprint author), Inst Nacl Astrofis Opt & Electr, Apartado Postal 51-216, Puebla 72000, Mexico.; Pena-Herazo, HA (reprint author), Univ Torino, Dipartimento Fis, Via Pietro Giuria 1, I-10125 Turin, Italy.; Pena-Herazo, HA (reprint author)

ASTROPHYSICS AND SPACE SCIENCE, 2019; 364 (5):

Abstract

Nearly one third of the sources in the Fermi-LAT catalogs lacks a lower energy counterpart, hence being referred as unidentified/unassociated gamma-ra......

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