Results 41 to 50 of about 643 (219)

The Size of the Radio‐Emitting Region in Low‐Luminosity Active Galactic Nuclei [PDF]

open access: greenThe Astrophysical Journal, 2005
61 pages, 17 figures, 10 tables.
J. M. Anderson, J. S. Ulvestad
openalex   +3 more sources

Observational Constraints on Direct Electron Heating in the Hot Accretion Flows in Sgr A* and M87*

open access: yesThe Astrophysical Journal, 2022
An important parameter in the theory of hot accretion flows around black holes is δ , which describes the fraction of “viscously” dissipated energy in the accretion flow that goes directly into heating electrons.
Fu-Guo Xie, Ramesh Narayan, Feng Yuan
doaj   +1 more source

Ultra-high-energy cosmic rays from low-luminosity active galactic nuclei [PDF]

open access: yesAstroparticle Physics, 2015
We investigate the production of ultra-high-energy cosmic ray (UHECR) in relativistic jets from low-luminosity active galactic nuclei (LLAGN). We start by proposing a model for the UHECR contribution from the black holes (BHs) in LLAGN, which present a jet power $P_{\mathrm{j}} \leqslant 10^{46}$ erg s$^{-1}$.
Dutan, Ioana, Caramete, Laurentiu I.
openaire   +2 more sources

Origin of Radio Emission from Nearby Low‐Luminosity Active Galactic Nuclei [PDF]

open access: yesThe Astrophysical Journal, 2005
25 pages, some references were added, accepted for publication in ...
Wu, Qingwen, Cao, Xinwu
openaire   +2 more sources

Surprisingly Strong K-band Emission Found in Low-luminosity Active Galactic Nuclei [PDF]

open access: yesThe Astrophysical Journal, 2019
Abstract We examine the near-infrared (NIR) emission from low-luminosity active galactic nuclei (LLAGNs). Our galaxy sample includes 15 objects with detected 2–10 keV X-ray emission, dynamical black hole mass estimates from the literature, and available Gemini/NIFS integral field spectroscopy data.
Antoine Dumont   +5 more
openaire   +3 more sources

EVN observations of low-luminosity flat-spectrum active galactic nuclei [PDF]

open access: yesMonthly Notices of the Royal Astronomical Society, 2001
We present and discuss the results of very-long baseline interferometry (VLBI, EVN) observations of three low-luminosity (P-5GHz <10(25) W Hz(-1)) broad emission line active galactic nuclei (AGNs) carefully selected from a sample of flat-spectrum radio sources (CLASS). Based on the total and the extended radio power at 5 and at 1.4 GHz respectively,
Caccianiga, A.   +3 more
openaire   +2 more sources

Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign

open access: yesThe Astrophysical Journal Letters, 2021
In 2017, the Event Horizon Telescope (EHT) Collaboration succeeded in capturing the first direct image of the center of the M87 galaxy. The asymmetric ring morphology and size are consistent with theoretical expectations for a weakly accreting ...
The EHT MWL Science Working Group   +745 more
doaj   +1 more source

A Candidate for the Least-massive Black Hole in the First 1.1 Billion Years of the Universe

open access: yesThe Astrophysical Journal Letters, 2023
We report a candidate of a low-luminosity active galactic nucleus (AGN) at z = 5 that was selected from the first near-infrared images of the JWST CEERS project.
Masafusa Onoue   +8 more
doaj   +1 more source

Millimeter-VLBI observations of low-luminosity active galactic nuclei\n with source-frequency phase-referencing [PDF]

open access: green, 2021
Abhishek V. Joshi   +5 more
openalex   +2 more sources

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