148 citations · 1.5k across the 40 of their papers we have counts for
15 papers · 1 filter
A re-emerging bright soft-X-ray state of the changing-look Active Galactic Nucleus 1ES~1927+654: a multi-wavelength view
Ritesh Ghosh, Sibasish Laha, Eileen Meyer +24
1ES1927+654 is a nearby active galactic nucleus that has shown an enigmatic outburst in optical/UV followed by X-rays, exhibiting strange variability patterns at timescales of mont…
The Multi-Wavelength Environment of Second Bologna Catalog Sources
A. Paggi, F. Massaro, H. Peña-Herazo +11
We present the first results of the Chandra Cool Targets (CCT) survey of the Second Bologna Catalog (B2CAT) of powerful radio sources, aimed at investigating the extended X-ray emi…
Supermassive Black Hole Winds in X-rays: SUBWAYS. II. HST UV spectroscopy of winds at intermediate redshifts
M. Mehdipour, G. A. Kriss, M. Brusa +35
We present a UV spectroscopic study of ionized outflows in 21 active galactic nuclei (AGN), observed with the HST. The targets of the SUBWAYS sample were selected with the aim to p…
Supermassive Black Hole Winds in X-rays -- SUBWAYS. I. Ultra-fast outflows in QSOs beyond the local Universe
G. A. Matzeu, M. Brusa, G. Lanzuisi +48
We present a new X-ray spectroscopic study of luminous () active galactic nuclei (AGNs) at intermed…
BASS XXXIX: Swift-BAT AGN with changing-look optical spectra
Matthew J. Temple, Claudio Ricci, Michael J. Koss +13
Changing-look (CL) AGN are unique probes of accretion onto supermassive black holes (SMBHs), especially when simultaneous observations in complementary wavebands allow investigatio…
BASS XXXIII: Swift-BAT blazars and their jets through cosmic time
L. Marcotulli, M. Ajello, C. M. Urry +13
We derive the most up-to-date Swift-Burst Alert Telescope (BAT) blazar luminosity function in the 14-195 keV range, making use of a clean sample of 118 blazars detected in the BAT…
BASS XXX: Distribution Functions of DR2 Eddington-ratios, Black Hole Masses, and X-ray Luminosities
Tonima Tasnim Ananna, Anna K. Weigel, Benny Trakhtenbrot +19
We determine the low-redshift X-ray luminosity function (XLF), active black hole mass function (BHMF), and Eddington-ratio distribution function (ERDF) for both unobscured (Type 1)…
Hidden treasures in the unknown 3CR extragalactic radio sky: a multi-wavelength approach
V. Missaglia, F. Massaro, E. Liuzzo +17
We present the analysis of multi-wavelength observations of seven extragalactic radio sources, listed as unidentified in the Third Cambridge Revised Catalog (3CR). X-ray observatio…
An optical overview of blazars with LAMOST I: Hunting changing-look blazars and new redshift estimates
Harold A. Peña-Herazo, Francesco Massaro, Minfeng Gu +6
The extragalactic -rays sky observed by Fermi-Large Area Telescope (LAT) is dominated by blazars. In the fourth release of the Fermi-LAT Point Source Catalog (4FGL), are sources…
BAT AGN Spectroscopic Survey XXVII: Scattered X-Ray Radiation in Obscured Active Galactic Nuclei
K. K. Gupta, C. Ricci, A. Tortosa +20
Accreting supermassive black holes (SMBHs), also known as active galactic nuclei (AGN), are generally surrounded by large amounts of gas and dust. This surrounding material reproce…
Optical spectroscopic observations of gamma-ray blazar candidates. X. Results from the 2018--2019 SOAR and OAN-SPM observations of blazar candidates of uncertain type
Raniere de Menezes, Raul A. Amaya-Almazán, Ezequiel J. Marchesini +14
The fourth Fermi Large Area Telescope Source Catalog (4FGL) lists over 5000 gamma-ray sources with statistical significance above 4. About 23% of the sources listed in this cata…
Optical characterization of WISE selected blazar candidates
Raniere de Menezes, Harold A. Peña-Herazo, Ezequiel J. Marchesini +8
Over the last decade more than five thousand gamma-ray sources were detected by the Large Area Telescope (LAT) on board Fermi Gamma-ray Space Telescope. Given the positional uncert…
Two new catalogs of blazar candidates in the WISE infrared sky
Raffaele D'Abrusco, Nuria Alvarez Crespo, Francesco Massaro +9
We present two catalogs of radio-loud candidate blazars whose WISE mid-infrared colors are selected to be consistent with the colors of confirmed gamma-ray emitting blazars. The fi…
Optical spectroscopic observations of -ray blazar candidates VI. Further observations from TNG, WHT, OAN, SOAR and Magellan telescopes
N. Álvarez Crespo, F. Massaro, D. Milisavljevic +16
Blazars, one of the most extreme class of active galaxies, constitute so far the largest known population of -ray sources and their number is continuously growing in the Fermi c…
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…