683 citations · 3.5k across the 37 of their papers we have counts for
38 papers
Collimation of the relativistic jet in the quasar 3C 273
Hiroki Okino, Kazunori Akiyama, Keiichi Asada +32
The collimation of relativistic jets launched from the vicinity of supermassive black holes (SMBHs) at the centers of active galactic nuclei (AGN) is one of the key questions to un…
Radio and -ray activity in the jet of the blazar S5 0716714
Dae-Won Kim, Evgeniya V. Kravchenko, Alexander M. Kutkin +11
We explore the connection between the -ray and radio emission in the jet of the blazar 0716714 by using 15, 37, and 230 GHz radio and 0.1200 GeV -ray light curves spann…
First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon
The Event Horizon Telescope Collaboration
Event Horizon Telescope (EHT) observations at 230 GHz have now imaged polarized emission around the supermassive black hole in M87 on event-horizon scales. This polarized synchrotr…
Co-training for Deep Object Detection: Comparing Single-modal and Multi-modal Approaches
Jose L. Gómez, Gabriel Villalonga, Antonio M. López
Top-performing computer vision models are powered by convolutional neural networks (CNNs). Training an accurate CNN highly depends on both the raw sensor data and their associated…
VLBI20-30: a scientific roadmap for the next decade -- The future of the European VLBI Network
Tiziana Venturi, Zsolt Paragi, Michael Lindqvist +77
This white paper describes the science case for Very Long Baseline Interferometry (VLBI) and provides suggestions towards upgrade paths for the European VLBI Network (EVN). The EVN…
Spitzer Observations of the Predicted Eddington Flare from Blazar OJ 287
Seppo Laine, Lankeswar Dey, Mauri Valtonen +25
Binary black hole (BH) central engine description for the unique blazar OJ 287 predicted that the next secondary BH impact-induced bremsstrahlung flare should peak on 2019 July 31.…
Studying Black Holes on Horizon Scales with VLBI Ground Arrays
Lindy Blackburn, Sheperd Doeleman, Jason Dexter +35
High-resolution imaging of supermassive black holes is now possible, with new applications to testing general relativity and horizon-scale accretion and relativistic jet formation…
TeraHertz Exploration and Zooming-in for Astrophysics (THEZA): ESA Voyage 2050 White Paper
Leonid I. Gurvits, Zsolt Paragi, Viviana Casasola +32
This paper presents the ESA Voyage 2050 White Paper for a concept of TeraHertz Exploration and Zooming-in for Astrophysics (THEZA). It addresses the science case and some implement…
Active galactic nuclei imaging programs of the RadioAstron mission
Gabriele Bruni, Tuomas Savolainen, Jose Luis Gómez +2
Imaging relativistic jets in active galactic nuclei (AGN) at angular resolution significantly surpassing that of the ground-based VLBI at centimetre wavelengths is one of the key s…
The magnetic field structure in CTA 102 from high resolution mm-VLBI observations during the flaring state in 2016-2017
Carolina Casadio, Alan P. Marscher, Svetlana G. Jorstad +14
Investigating the magnetic field structure in the innermost regions of relativistic jets is fundamental to shed light on the crucial physical processes giving rise to the jet forma…
Optical Emission and Particle Acceleration in a Quasi-Stationary Component in the Jet of OJ~287
Mahito Sasada, Svetlana Jorstad, Alan P. Marscher +12
We analyze the linear polarization of the relativistic jet in BL Lacertae object OJ~287 as revealed by multi-epoch Very Long Baseline Array (VLBA) images at 43 GHz and monitoring o…
Total and linearly polarized synchrotron emission from overpressured magnetized relativistic jets
Antonio Fuentes, José L. Gómez, José M. Martí +1
We present relativistic magnetohydrodynamic (RMHD) simulations of stationary overpressured magnetized relativistic jets which are characterized by their dominant type of energy, na…
Kinematics of Parsec-Scale Jets of Gamma-Ray Blazars at 43~GHz within the VLBA-BU-BLAZAR Program
Svetlana G. Jorstad, Alan P. Marscher, Daria A. Morozova +10
We analyze the parsec-scale jet kinematics from 2007 June to 2013 January of a sample of -ray bright blazars monitored roughly monthly with the Very Long Baseline Array at 43~GH…
VLBA polarimetric monitoring of 3C 111
T. Beuchert, M. Kadler, M. Perucho +17
We aim to better understand the dynamics within relativistic magneto-hydrodynamical flows in the extreme environment and close vicinity of supermassive black holes. To do so, we an…
Magnetized, Relativistic Jets
Manel Perucho, José María Martí, José Luís Gómez +1
Extragalactic relativistic jets are composed by charged particles and magnetic fields, as inferred from the synchrotron emission that we receive from them. The Larmor radii of the…
Evolution of Global Relativistic Jets: Collimations and Expansion with kKHI and the Weibel Instability
K. I Nishikawa, J. T. Frederiksen, A. Nordlund +10
One of the key open questions in the study of relativistic jets is their interaction with the environment. Here, we study the initial evolution of both electron-proton and electron…
A multi-wavelength polarimetric study of the blazar CTA 102 during a Gamma-ray flare in 2012
Carolina Casadio, José L. Gómez, Svetlana G. Jorstad +28
We perform a multi-wavelength polarimetric study of the quasar CTA 102 during an extraordinarily bright -ray outburst detected by the {\it Fermi} Large Area Telescope in Septemb…
The connection between the radio jet and the gamma-ray emission in the radio galaxy 3C 120
Carolina Casadio, José L. Gómez, Paola Grandi +6
We present the analysis of the radio jet evolution of the radio galaxy 3C 120 during a period of prolonged gamma-ray activity detected by the Fermi satellite between December 2012…
Parsec scale polarization properties of the TeV blazar Markarian 421
R. Lico, M. Giroletti, M. Orienti +15
In this work we present a polarization analysis at radio frequencies of Markarian 421, one of the closest (z=0.03) TeV blazars. The observations were obtained, both in total and in…
Continuing EVN monitoring of HST-1 in the jet of M87
Kazuhiro Hada, Marcello Giroletti, Gabriele Giovannini +9
The relativistic jet in M87 offers a unique opportunity for understanding the detailed jet structure and emission processes due to its proximity. In particular, the peculiar jet re…
The connection between the parsec-scale radio jet and gamma-ray flares in the blazar 1156+295
Venkatessh Ramakrishnan, Jonathan León-Tavares, Elizaveta A. Rastorgueva-Foi +30
The blazar 1156+295 was active at gamma-ray energies, exhibiting three prominent flares during the year 2010. Here, we present results using the combination of broadband (X-ray thr…
Comprehensive Monitoring of Gamma-ray Bright Blazars. I. Statistical Study of Optical, X-ray, and Gamma-ray Spectral Slopes
Karen E. Williamson, Svetlana G. Jorstad, Alan P. Marscher +21
We present -ray, X-ray, ultraviolet, optical, and near-infrared light curves of 33 -ray bright blazars over four years that we have been monitoring since 2008 August with mul…
Evidence of internal rotation and a helical magnetic field in the jet of the quasar NRAO150
Sol N. Molina, Iván Agudo, José L. Gómez +3
The source NRAO150 is a very prominent millimeter to radio emitting quasar at redshift z=1.52 for which previous millimeter VLBI observations revealed a fast counterclockwise rotat…
A strong radio brightening at the jet base of M87 during the elevated very-high-energy gamma-ray state in 2012
K. Hada, M. Giroletti, M. Kino +18
We report our intensive radio monitoring observations of the jet in M87 with the VLBI Exploration of Radio Astrometry (VERA) and the European VLBI Network (EVN) from February 2011…