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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 of the Fermi catalog there is still a large fraction of sources that are clas...


Crespo, NAMassaro, FMilisavljevic, DLandoni, MChavushyan, VPatino-Alvarez, VMasetti, NJimenez-Bailon, EStrader, JChomiuk, LKatagiri, HKagaya, MCheung, CCPaggi, AD'Abrusco, RRicci, FLa Franca, FSmith, HATosti, G[OPTICAL SPECTROSCOPIC OBSERVATIONS OF GAMMA-RAY BLAZAR CANDIDATES. VI. FURTHER OBSERVATIONS FROM TNG, WHT, OAN, SOAR, AND MAGELLAN TELESCOPES]OPTICAL SPECTROSCOPIC OBSERVATIONS OF GAMMA-RAY BLAZAR CANDIDATES. VI. FURTHER OBSERVATIONS FROM TNG, WHT, OAN, SOAR, AND MAGELLAN TELESCOPES

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 6716, 6731/H alpha, [O I] lambda 6300/H alpha, [O III] lambda 5007/H beta, [...


Oh, KSchawinski, KKoss, MTrakhtenbrot, BLamperti, IRicci, CMushotzky, RVeilleux, SBerney, SCrenshaw, DMGehrels, NHarrison, FMasetti, NSoto, KTStern, DTreister, EUeda, Y[BAT AGN Spectroscopic Survey – III. An observed link between AGN Eddington ratio and narrow-emission-line ratios]BAT AGN Spectroscopic Survey – III. An observed link between AGN Eddington ratio and narrow-emission-line ratios

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 candidates, mostly found while searching for low-energy counterparts of the unide...


Massaro, FMarchesini, EJD'Abrusco, RMasetti, NAndruchow, ISmith, HA[RADIO-WEAK BL LAC OBJECTS IN THE FERMI ERA]RADIO-WEAK BL LAC OBJECTS IN THE FERMI ERA

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 positions of unidentified gamma-ray sources from the First Fermi Catalog of gamm...


Marchesini, EJMasetti, NChavushyan, VCellone, SAAndruchow, IBassani, LBazzano, AJimenez-Bailon, ELandi, RMalizia, APalazzi, EPatino-Alvarez, VRodriguez-Castillo, GAStephen, JBUbertini, P[Looking for blazars in a sample of unidentified high-energy emitting Fermi sources]Looking for blazars in a sample of unidentified high-energy emitting Fermi sources

Supergiant fast X-ray transients (SFXTs) are high mass X-ray binaries (HMXBs) hosting a neutron star and an OB supergiant companion. We examine the available Swift data, as well as other new or archival / serendipitous data, on three sources: IGR J17407 2808, 2XMM J185114.3 000004, and IGR J18175...


Romano, PBozzo, EEsposito, PSbarufatti, BHaberl, FPonti, GD'Avanzo, PDucci, LSegreto, AJin, CMasetti, NDel Santo, MCampana, SMangano, V[Searching for supergiant fast X-ray transients with Swift]Searching for supergiant fast X-ray transients with Swift

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