Results 41 to 50 of about 148 (122)

First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon

open access: yesThe Astrophysical Journal Letters, 2021
Event Horizon Telescope (EHT) observations at 230 GHz have now imaged polarized emission around the supermassive black hole in M87 on event-horizon scales.
The Event Horizon Telescope Collaboration   +241 more
doaj   +1 more source

First Frequency Phase Transfer from the 3 mm to the 1 mm Band on an Earth-sized Baseline

open access: yesThe Astronomical Journal
Frequency phase transfer (FPT) is a technique designed to increase coherence and sensitivity in radio interferometry by making use of the nondispersive nature of the troposphere to calibrate high-frequency data using solutions derived at a lower ...
Sara Issaoun   +35 more
doaj   +1 more source

POLAMI Multiwavelength Polarization Study of Active Galactic Nuclei Jets: A Millimeter–Optical Comparison

open access: yesThe Astrophysical Journal Supplement Series
Millimeter-band polarimetry offers a powerful probe of active galactic nuclei jets, accessing regions less affected by opacity and Faraday rotation than at longer radio wavelengths.
Carolina Casadio   +22 more
doaj   +1 more source

Monitoring of 3C 286 with ALMA, IRAM, and SMA from 2006 to 2025: Stability, Synchrotron Ages, and Frequency-dependent Polarization Attributed to Core-shift

open access: yesThe Astrophysical Journal
We present the results of multifrequency monitoring of the radio quasar 3C 286, conducted using three instruments: the Atacama Large Millimeter/submillimeter Array (ALMA) at 91.5, 103.5, 233.0, and 343.4 GHz, the IRAM 30 m Telescope at 86 and 229 GHz ...
Minchul Kam   +25 more
doaj   +1 more source

The Lockman-SpReSo Project. Spectroscopic Analysis of Type 1 Active Galactic Nuclei

open access: yesThe Astrophysical Journal
We present the first optical-UV spectral systematic analysis of 30 Type 1 active galactic nuclei selected in the far-infrared and X-ray in the Lockman-SpReSO Survey.
Castalia Alenka Negrete   +22 more
doaj   +1 more source

THEMIS: A Parameter Estimation Framework for the Event Horizon Telescope

open access: yesThe Astrophysical Journal, 2020
The Event Horizon Telescope (EHT) provides the unprecedented ability to directly resolve the structure and dynamics of black hole emission regions on scales smaller than their horizons.
Avery E. Broderick   +193 more
doaj   +1 more source

Detection of Compton Scattering in the Jet of 3C 84

open access: yesThe Astrophysical Journal Letters
3C 84 is the brightest cluster galaxy in the Perseus Cluster. It is among the closest radio-loud active galaxies and among the very few that can be detected from low-frequency radio up to TeV γ -rays.
Ioannis Liodakis   +79 more
doaj   +1 more source

Analysis of the contribution of sport events to sustainable development: Impacts, support and resident's perception. [PDF]

open access: yesHeliyon, 2023
Parra-Camacho D   +3 more
europepmc   +1 more source

First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole

open access: yesThe Astrophysical Journal Letters, 2019
When surrounded by a transparent emission region, black holes are expected to reveal a dark shadow caused by gravitational light bending and photon capture at the event horizon.
The Event Horizon Telescope Collaboration   +348 more
doaj   +1 more source

First M87 Event Horizon Telescope Results. II. Array and Instrumentation

open access: yesThe Astrophysical Journal Letters, 2019
The Event Horizon Telescope (EHT) is a very long baseline interferometry (VLBI) array that comprises millimeter- and submillimeter-wavelength telescopes separated by distances comparable to the diameter of the Earth. At a nominal operating wavelength of ∼
The Event Horizon Telescope Collaboration   +341 more
doaj   +1 more source

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