Results 11 to 20 of about 184,376 (200)
A Radio Survey for Linear and Circular Polarization in Low Luminosity Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2002 We conducted a Very Large Array survey of eleven low luminosity active galactic nuclei for linear and circular polarization at 8.4 GHz. We detected circular polarization in one source (M81*) and linear polarization in 3 sources. Sensitivity limits were ~0.1% for both modes of polarization in 9 of 11 sources.
Geoffrey C. Bower +2 more
+7 more sources
The Astrophysical Journal Letters, 2021 Abstract We report millimeter-VLBI results of low-luminosity active galactic nuclei (M84 and M87) up to 88 GHz with source-frequency phase-referencing observations. We detected the weak VLBI core and obtained the first image of M84 at 88 GHz. The derived brightness temperature of the M84 core was about 7.2 × 109 K, which could serve as a
Wu Jiang +5 more
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Observational Evidence for Hot Wind Impact on Parsec Scales in Low-luminosity Active Galactic Nuclei [PDF]
The Astrophysical JournalSupermassive black holes in galaxies spend the majority of their lifetime in the low-luminosity regime, powered by hot accretion flow. Strong winds launched from the hot accretion flow have the potential to play an important role in active galactic ...
Fangzheng Shi +4 more
doaj +2 more sources
Evidence for Jet Domination of the Nuclear Radio Emission in Low-Luminosity Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2001 We present simultaneous, sub-arcsecond (<=50pc) resolution 5 GHz, 8.4 GHz, and 15 GHz VLA observations of a well-defined sample of sixteen low-luminosity active galactic nuclei (LLAGNs). The radio emission in most of these nuclei does not show the rising spectrum (0.2 <= s <= 1.3, L_nu propto nu^{s}) expected from thermal electrons in an ...
Neil M. Nagar, A. S. Wilson, H. Falcke
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The Astrophysical JournalTheoretical and numerical simulations of black hole hot accretion flows have shown the ubiquitous existence of winds and predicted their properties, such as velocity and mass flux.
Fangzheng Shi +3 more
doaj +2 more sources
VLBI Imaging of Parsec-scale Radio Structures in Nearby Low-luminosity Active Galactic Nuclei
The Astrophysical Journal Supplement SeriesWe report the results of high-resolution 5 GHz Very Long Baseline Array and European VLBI Network observations of 36 nearby galaxies, an extension of the Legacy e-MERLIN Multi-band Imaging of Nearby Galaxies survey.
Xiaopeng Cheng +7 more
doaj +2 more sources
The Astrophysical JournalDisk continuum reverberation mapping is one of the primary ways we learn about active galactic nuclei (AGN) accretion disks. Reverberation mapping assumes that time-varying X-rays incident on the accretion disk drive variability in UV–optical light ...
Amy Secunda +2 more
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Probing The Central Engines Of Low-Luminosity Active Galactic Nuclei
, 2013 I give a brief review of the observational properties of low-luminosity AGNs (LLAGNs). I outline some unresolved issues in the study of LLAGNs, emphasizing the uncertainties in the role of the truncated thin accretion disk, the dusty obscuring torus and the origin of high-energy radiation (X-rays and gamma-rays).
Rodrigo Nemmen
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γ-rays as a diagnostic of the origin of core radiation in low-luminosity active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2011 8 pages, 3 figures, accepted for publication in Monthly Notices of the Royal Astronomical ...
Hajime Takami
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The Nature of the Low-Luminosity Active Galactic Nuclei in NGC 3147
The Astrophysical Journal, 1996 A. Ptak +4 more
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