José L. Gómez

Video reconstruction of variable VLBI observations with neural fields

Marianna Foschi, Brandon Zhao, Antonio Fuentes, Katherine L. Bouman et autres

Abstract Supermassive black hole accretion and the ejection of collimated, relativistic jets of plasma are intrinsically dynamic processes shaped by large-scale magnetic fields 1–4 . Various algorithms have been developed to image these objects at different scales using radio interferometric observations 5–8 …

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High energy multimessenger blazar PKS 1424+240

Y. Y. Kovalev, A. B. Pushkarev, José L. Gómez, D. C. Homan et autres

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VLBI Observations of Nearby HBLs: Physical Implications

Svetlana G. Jorstad, Alan P. Marscher, José L. Gómez

We review the jet kinematics of HBL blazars based on results of the MOJAVE survey, which obtained images of active galactic nuclei with the Very Long Baseline Array (VLBA) at 15 GHz, and the VLBA-BU-BLAZAR program as well as its successor BEAM-ME …

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Locating the missing large-scale emission in the jet of M87* with short EHT baselines

Boris Georgiev, Paul Tiede, Sebastiano D. von Fellenberg, Michael Janssen et autres

In very-long baseline interferometric arrays, nearly co-located stations probe the largest scales and typically cannot resolve the observed source. In the absence of a large-scale structure, closure phases constructed with these stations are zero and, since they are independent of station-based errors, …

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Probing jet base emission of M87* with the 2021 Event Horizon Telescope observations

Hendrik Müller, S. D. von Fellenberg, Paul Tiede, Michaël Janssen et autres

We investigate the presence and spatial characteristics of the jet base emission in M87* at 230 GHz, enabled by the enhanced uv coverage in the 2021 Event Horizon Telescope (EHT) observations. The addition of the 12-m Kitt Peak Telescope and NOEMA provides …

Revisiting 3C 279 jet morphology with space VLBI at 26 microarcsecond resolution

Teresa Toscano, José L. Gómez, Guang-Yao Zhao, Rocco Lico et autres

We present observations of the blazar 3C 279 at 22 GHz by the space-based very long baseline interferometry mission RadioAstron from January 15, 2018. We reconstructed images in both total intensity and fractional polarization using the regularized maximum likelihood method implemented in …

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Spatially resolved polarization swings in the supermassive binary black hole candidate OJ 287 with first Event Horizon Telescope observations

José L. Gómez, Ilje Cho, Efthalia Traianou, P. Thomas Krichbaum et autres

We present the first Event Horizon Telescope 1.3 mm observations of the supermassive binary black hole candidate OJ 287. The observations achieved an unprecedented angular resolution of 18 μas and reveal significant structural and polarization variability over just five days, marking the …

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Looking into the jet cone of the neutrino-associated very high-energy blazar PKS 1424+240

Y. Y. Kovalev, A. B. Pushkarev, José L. Gómez, D. C. Homan et autres

Context. The acceleration process of massive particles as well as the production of very high-energy (VHE) photons and neutrinos remains a fundamental challenge in astrophysics. Aims. We investigate the parsec-scale jet structure and magnetic field of the blazar PKS 1424+240, which was …

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Revealing a ribbon-like jet in OJ 287 with RadioAstron

Efthalia Traianou, José L. Gómez, Ilje Cho, Andrew Chael et autres

We present space-based very long baseline interferometry observations of the BL Lac type object OJ 287 taken with RadioAstron at 22 GHz on April 25, 2016, in conjunction with a ground array comprising 27 radio telescopes. We detect ground-space fringes at projected …

A Two-week IXPE Monitoring Campaign on Mrk 421

W. Peter Maksym, Ioannis Liodakis, M. Lynne Saade, Dawoon E. Kim et autres

Abstract X-ray polarization is a unique new probe of the particle acceleration in astrophysical jets made possible through the Imaging X-ray Polarimetry Explorer. Here we report on the first dense X-ray polarization monitoring campaign on the blazar Mrk 421. Our observations were …

Origin of the ring ellipticity in the black hole images of M87 *

Rohan Dahale, Ilje Cho, Kotaro Moriyama, K. Wiik et autres

We investigate the origin of the elliptical ring structure observed in the images of the supermassive black hole M87 * , aiming to disentangle contributions from gravitational, astrophysical, and imaging effects. Leveraging the enhanced capabilities of the Event Horizon Telescope (EHT)'s 2018 …

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Helical magnetic field structure in 3C 273

Teresa Toscano, S. N. Molina, José L. Gómez, Ai-Ling Zeng et autres

We present a study on rotation measure (RM) of the quasar 3C 273. This analysis aims to discern the magnetic field structure and its temporal evolution. The quasar 3C 273 is one of the most studied active galactic nuclei due to its …

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