Now showing items 1-5 of 5

    • BAT AGN Spectroscopic Survey – III. An observed link between AGN Eddington ratio and narrow-emission-line ratios 

      Oh, K; Schawinski, K; Koss, M; Trakhtenbrot, B; Lamperti, I; Ricci, C; Mushotzky, R; Veilleux, S; Berney, S; Crenshaw, DM; Gehrels, N; Harrison, F; Masetti, N; Soto, KT; Stern, D; Treister, E; Ueda, Y (OXFORD UNIV PRESS, 2016-09)
      We investigate the observed relationship between black hole mass (M-BH), bolometric luminosity (L-bol) and Eddington ratio (lambda(Edd)) with optical emission-line ratios ([N II] lambda 6583/H alpha, [S II] lambda lambda ...
    • Chemical abundances of giant stars in NGC 5053 and NGC 5634, two globular clusters associated with the Sagittarius dwarf spheroidal galaxy? 

      Sbordone, L.; Monaco, L.; Moni Bidin, C.; Bonifacio, P.; Villanova, S.; Bellazzini, M.; Ibata, R.; Chiba, M.; Geisler, D.; Caffau, E.; Duffau, S. (EDP SCIENCES, 2015-07)
      Context. The tidal disruption of the Sagittarius dwarf spheroidal galaxy (Sgr dSph) is producing the most prominent substructure in the Milky Way (MW) halo, the Sagittarius Stream. Aside from field stars, it is suspected ...
    • Looking for blazars in a sample of unidentified high-energy emitting Fermi sources 

      Marchesini, EJ; Masetti, N; Chavushyan, V; Cellone, SA; Andruchow, I; Bassani, L; Bazzano, A; Jimenez-Bailon, E; Landi, R; Malizia, A; Palazzi, E; Patino-Alvarez, V; Rodriguez-Castillo, GA; Stephen, JB; Ubertini, P (EDP SCIENCES, 2016-11)
      Context. Based on their overwhelming dominance among associated Fermi gamma-ray catalogue sources, it is expected that a large fraction of the unidentified Fermi objects are blazars. Through crossmatching between the ...
    • OPTICAL SPECTROSCOPIC OBSERVATIONS OF GAMMA-RAY BLAZAR CANDIDATES. VI. FURTHER OBSERVATIONS FROM TNG, WHT, OAN, SOAR, AND MAGELLAN TELESCOPES 

      Crespo, NA; Massaro, F; Milisavljevic, D; Landoni, M; Chavushyan, V; Patino-Alvarez, V; Masetti, N; Jimenez-Bailon, E; Strader, J; Chomiuk, L; Katagiri, H; Kagaya, M; Cheung, CC; Paggi, A; D'Abrusco, R; Ricci, F; La Franca, F; Smith, HA; Tosti, G (IOP PUBLISHING, 2016)
      Blazars, one of the most extreme classes of active galaxies, constitute so far the largest known population of.-ray sources, and their number is continuously growing in the Fermi catalogs. However, in the latest release ...
    • RADIO-WEAK BL LAC OBJECTS IN THE FERMI ERA 

      Massaro, F; Marchesini, EJ; D'Abrusco, R; Masetti, N; Andruchow, I; Smith, HA (ASTROPHYSICAL JOURNAL, 834 (2):10.3847/1538-4357/834/2/113 JAN 6 201, 2017-01)
      The existence of "radio-weak BL Lac objects" (RWBLs) has been an open question, and has remained unsolved since the discovery that quasars could be radio-quiet or radio-loud. Recently, several groups identified RWBL ...