537 citations · 3k across the 121 of their papers we have counts for
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The circum-galactic medium of quasars: CIV absorption systems
M. Landoni, R. Falomo, A. Treves +2
We investigate the properties of the circumgalactic gas in the halo of quasar host galaxies from CIV absorption line systems. Optical spectroscopy of closely aligned pairs of quasa…
Optical spectroscopy of SDSS J004054.65-0915268: three possible scenarios for the classification. A z \sim 5 BL Lacertae, blue FSRQ or a weak emission line quasar
M. Landoni, A. Zanutta, A. Bianco +3
The haunt of high redshift BL Lacerate objects is day by day more compelling, to firmly understand their intrinsic nature and evolution. SDSS J004054.65-0915268 is, at the moment,…
What is the redshift of the gamma- ray BL Lac source S4 0954+65?
M. Landoni, R. Falomo, A. Treves +2
High signal-to-noise ratio spectroscopic observations of the BL Lac object S4 0954+65 at the alleged redshift z = 0.367 are presented. This source was detected at gamma frequencies…
Refining the associations of the Fermi Large Area Telescope Source Catalogs
F. Massaro, R. D'Abrusco, M. Landoni +10
The Fermi-Large Area Telescope (LAT) First Source Catalog (1FGL) was released in February 2010 and the Fermi-LAT 2-Year Source Catalog (2FGL) appeared in April 2012, based on data…
Optical spectroscopic observations of gamma-ray blazar candidates IV. Results of the 2014 follow-up campaign
F. Ricci, F. Massaro, M. Landoni +7
The extragalactic gamma-ray sky is dominated by the emission arising from blazars, one of the most peculiar classes of radio-loud active galaxies. Since the launch of Fermi several…
Optical spectroscopic observations of gamma-ray blazar candidates III. The 2013/2014 campaign in the Southern Hemisphere
M. Landoni, F. Massaro, A. Paggi +8
We report the results of our exploratory program carried out with the Southern Astrophysical Research (SOAR) telescope aimed at associating counterparts and establishing the nature…
Optical spectroscopic observations of gamma-ray blazar candidates II. The 2013 KPNO campaign in the Northern Hemisphere
F. Massaro, M. Landoni, R. D'Abrusco +5
We recently started a systematic search of low-energy counterparts of the unidentified gamma-ray sources (UGSs) listed in the Fermi-Large Area Telescope (LAT) First Source Catalog…