From radio-quiet to radio-silent: low-luminosity Seyfert radio cores

@article{Chiaraluce2019FromRT,
  title={From radio-quiet to radio-silent: low-luminosity Seyfert radio cores},
  author={E Chiaraluce and Gabriele Bruni and Francesca Panessa and Marcello Giroletti and Monica Orienti and Hayden Rampadarath and Fausto Vagnetti and Francesco Tombesi},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2019}
}
A strong effort has been devoted to understand the physical origin of radio emission from low-luminosity AGN (LLAGN), but a comprehensive picture is still missing. We used high-resolution ($\le$1 arcsec), multi-frequency (1.5, 5.5, 9 and 14 GHz) NSF's Karl G. Jansky Very Large Array (VLA) observations to characterise the state of the nuclear region of ten Seyfert nuclei, which are the faintest members of a complete, distance-limited sample of 28 sources. With the sensitivity and… 

Figures and Tables from this paper

Hard-X-ray-selected active galactic nuclei – I. A radio view at high frequencies
A thorough study of radio emission in Active Galactic Nuclei (AGN) is of fundamental importance to understand the physical mechanisms responsible for the emission and the interplay between
The origin of radio emission from radio-quiet active galactic nuclei
The central nuclei of galaxies, where supermassive black holes (SMBHs) are thought to reside, can experience phases of activity when they become active galactic nuclei (AGNs). An AGN can eject winds
Radiation pressure confinement – V. The predicted free–free absorption and emission in active galactic nuclei
The effect of radiation pressure compression (RPC) on ionized gas in active galactic nuclei (AGNs) likely sets the photoionized gas density structure. The photoionized gas free–free absorption and
Some Notes About the Current Researches on the Physics of Relativistic Jets
  • L. Foschini
  • Physics
    Frontiers in Astronomy and Space Sciences
  • 2021
Some highlights of the recent researches in the field of relativistic jets are reviewed and critically analyzed. Given the extent of the available literature, this essay symbolically takes the baton

References

SHOWING 1-10 OF 54 REFERENCES
Radio Sources in Low-Luminosity Active Galactic Nuclei. I. VLA Detections of Compact, Flat-Spectrum Cores
We report a high-resolution (02), 15 GHz survey of a sample of 48 low-luminosity active galactic nuclei with the Very Large Array. Compact radio emission has been detected above a flux density of 1.1
THE PARSEC-SCALE RADIO STRUCTURE OF NGC 1068 AND THE NATURE OF THE NUCLEAR RADIO SOURCE
We present sensitive, multifrequency Very Long Baseline Array (VLBA) images of the nuclear radio sources of NGC 1068. At 5 and 8.4 GHz, the radio continuum source S1, argued to mark the location of
THE FAINTEST SEYFERT RADIO CORES REVEALED BY VLBI
In this Letter, we report on dual-frequency European VLBI Network observations of the faintest and least luminous radio cores in Seyfert nuclei, going to sub-millijansky flux densities and radio
15-GHz radio emission from nearby low-luminosity active galactic nuclei
We present a sub-arcsec resolution radio imaging survey of a sample of 76 low-luminosity active galactic nuclei (LLAGN) that were previously not detected with the Very Large Array at 15 GHz. Compact,
Radio Sources in Low-Luminosity Active Galactic Nuclei. II. Very Long Baseline Interferometry Detections of Compact Radio Cores and Jets in a Sample of LINERs
We have used the VLBA at 5 GHz to observe all galaxies with nuclear radio flux densities above 3.5 mJy found in a VLA survey at 15 GHz of a sample of nearby LINER galaxies. All galaxies were detected
Radio sources in low-luminosity active galactic nuclei IV. Radio luminosity function, importance of jet power, and radio properties of the complete Palomar sample
We present the completed results of a high resolution radio imaging survey of all (∼200) low-luminosity active galactic nuclei (LLAGNs) and AGNs in the Palomar Spectroscopic Sample of all (∼488)
Chandra Snapshot Observations of Low-Luminosity Active Galactic Nuclei with a Compact Radio Source
The results of Chandra snapshot observations of 11 low-ionization nuclear emission-line regions (LINERs), three low-luminosity Seyfert galaxies, and one H II-LINER transition object are presented.
The Size of the radio-emitting region in low-luminosity active galactic nuclei
We have used the VLA to study radio variability among a sample of 18 low-luminosity active galactic nuclei (LLAGNs) on timescales of a few hours to 10 days. The goal was to measure or limit the sizes
Physical properties of the nuclear region in Seyfert galaxies derived from observations with the European VLBI Network
We report on sensitive dual-frequency (1.7 and 5 GHz) European very long baseline interferometry Network observations of the central region of nine Seyfert galaxies. These sources are among the
Radio Continuum Survey of an Optically Selected Sample of Nearby Seyfert Galaxies
We have used the Very Large Array (VLA) to conduct a survey for radio continuum emission in the sample of 52 Seyfert nuclei selected from the optical spectroscopic galaxy catalog of Ho, Filippenko, &
...
...