Publications (12)
Multiwavelength picture of the blazar S5 0716+714 during its brightest outburst
Marina Manganaro, Giovanna Pedaletti, Marlene Doert +24
S5 0716+714 is a well known BL Lac object, one of the brightest and most active blazars. The discovery in the Very High Energy band (VHE, E > 100 GeV) by MAGIC happened in 2008. In…
Blazars at the Cosmic Dawn
Vaidehi S. Paliya, M. Ajello, H. -M. Cao +5
The uncharted territory of the high-redshift () Universe holds the key to understand the evolution of quasars. In an attempt to identify the most extreme members of the…
Exploring the Variability of the Flat Spectrum Radio Source 1633+382. I. Phenomenology of the Light Curves
Juan-Carlos Algaba, Sang-Sung Lee, Dae-Won Kim +15
We present multi-frequency simultaneous VLBI radio observations of the flat spectrum radio quasar 1633+382 (4C~38.41) as part of the interferometric monitoring of gamma-ray bright…
Gamma-ray blazars near equipartition and the origin of the GeV spectral break in 3C 454.3
Matteo Cerruti, Charles D. Dermer, Benoit Lott +2
Observations performed with the Fermi-LAT telescope have revealed the presence of a spectral break in the GeV spectrum of flat-spectrum radio quasars (FSRQs) and other low- and int…
Incremental Fermi Large Area Telescope Fourth Source Catalog
LAT collaboration, Soheila Abdollahi, Fabio Acero +137
We present an incremental version (4FGL-DR3, for Data Release 3) of the fourth Fermi-LAT catalog of gamma-ray sources. Based on the first twelve years of science data in the energy…
On leptonic models for blazars in the Fermi era
Charles Dermer, Benoit Lott
Some questions raised by Fermi-LAT data about blazars are summarized, along with attempts at solutions within the context of leptonic models. These include both spectral and statis…
The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope -- Data Release 3
LAT collaboration, Marco Ajello, Luca Baldini +100
An incremental version of the fourth catalog of active galactic nuclei (AGNs) detected by the Fermi-Large Area Telescope is presented. This version (4LAC-DR3) derives from the thir…
The 3rd Catalog of AGN Detected by the Fermi LAT
Dario Gasparrini, Benoit Lott, Sara Cutini +2
The third catalog of active galactic nuclei (AGNs) detected by the Fermi Large Area Telescope (3LAC) is presented. It is based on the third catalog (3FGL,\cite{3FGL}) of sources de…
Near-Equipartition Jets with Log-Parabola Electron Energy Distribution and the Blazar Spectral-Index Diagrams
Charles D. Dermer, Dahai Yan, Li Zhang +2
Fermi-LAT analyses show that the gamma-ray photon spectral indices Gamma_gamma of a large sample of blazars correlate with the vFv peak synchrotron frequency v_s according to the r…
Equipartition Gamma-Ray Blazars and the Location of the Gamma-Ray Emission Site in 3C 279
Charles D. Dermer, Matteo Cerruti, Benoit Lott +2
Blazar spectral models generally have numerous unconstrained parameters, leading to ambiguous values for physical properties like Doppler factor delta or fluid magnetic field B'. T…
Time Delay of Cascade Radiation for TeV Blazars and the Measurement of the Intergalactic Magnetic Field
Charles D. Dermer, Massimo Cavadini, Soebur Razzaque +3
Recent claims that the strength B_IGMF of the intergalactic magnetic field (IGMF) is >~ 1e-15 G are based on upper limits to the expected cascade flux in the GeV band produced by b…
Temporal Correlations Between Optical and Gamma-ray Activity in Blazars
Daniel P. Cohen, Roger W. Romani, Alexei V. Filippenko +4
We have been using the 0.76-m Katzman Automatic Imaging Telescope (KAIT) at Lick Observatory to optically monitor a sample of 157 blazars that are bright in gamma rays, being detec…