Results 11 to 20 of about 47,708 (236)

Gamma-ray observations of low-luminosity active galactic nuclei [PDF]

Monthly Notices of the Royal Astronomical Society, 2020
ABSTRACTThe majority of the activity around nearby (z ≈ 0) supermassive black holes is found in low-luminosity active galactic nuclei (LLAGN), the most of them being classified as low-ionization nuclear emission regions. Although these sources are well studied from radio up to X-rays, they are poorly understood in γ-rays.
Raniere de Menezes, Rodrigo Nemmen, Justin D Finke, Ivan Almeida, Bindu Rani   +4 more
semanticscholar   +6 more sources

Radio sources in low-luminosity active galactic nuclei [PDF]

Astronomy & Astrophysics, 2002
to appear in A& ...
Nagar, N. M., Falcke, H., Wilson, A. S., Ulvestad, J. S.   +3 more
semanticscholar   +6 more sources

15-GHz radio emission from nearby low-luminosity active galactic nuclei [PDF]

Astronomy & Astrophysics, 2018
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, parsec-scale radio emission has been detected above a flux density of 40 μ Jy in 60% (45 of 76) of the LLAGN sample.
Saikia, Payaswini, Körding, Elmar, Coppejans, Deanne L., Falcke, Heino, Williams, David, Baldi, Ranieri D., Mchardy, Ian, Beswick, Rob   +7 more
semanticscholar   +13 more sources

Broadband Modeling of Low-luminosity Active Galactic Nuclei Detected in Gamma Rays [PDF]

The Astrophysical Journal, 2021
Abstract Low-luminosity active galactic nuclei are more abundant and closer to us than the luminous ones but harder to explore as they are faint. We have selected the four sources, NGC 315, NGC 4261, NGC 1275, and NGC 4486, which have been detected in γ-rays by Fermi-LAT.
Gunjan Tomar, Nayantara Gupta, Raj Prince   +2 more
openaire   +4 more sources

Low-Luminosity Active Galactic Nuclei [PDF]

Symposium - International Astronomical Union, 1989
I review the basic properties of low-luminosity active galactic nuclei (LLAGNs) — objects in which activity similar to, but intrinsically milder than, that in QSOs and luminous Seyferts is believed to be present. Until recently, most LLAGNs were first recognized as such and studied at optical wavelengths, but evidence for activity and valuable ...
A. Filippenko
openaire   +2 more sources

On the Unification of Low Luminosity Active Galactic Nuclei

International Journal For Multidisciplinary Research, 2023
We have used the distributions of observed radio properties of a subset of AGNs called low luminosity AGNs (LLAGNs) to investigate the relationship between radio-selected BL Lacs (RBLs and XBLs) and Fanaroff-Riley Type I radio galaxies (FRI) in accordance with the unified scheme. Analysis of the core and extended luminosity show that RBLs are more core
Godson Abbey -, Fibarr Odo -, Romanus Eze -, Golden Nyambuya -, Joseph Simfukwe -, P. Simpemba -   +5 more
openaire   +2 more sources

Radio Sources in Low-Luminosity Active Galactic Nuclei.IV. Radio Luminosity Function, Importance of Jet Power, and Radio Properties of the Complete Palomar Sample [PDF]

, 2004
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.
A. S. Wilson, Alonso-Herrero, Anderson, Antonucci, Barth, Barth, Beasley, Begelman, Bietenholz, Braatz, Carral, Celotti, Chatterjee, Colina, Condon, Condon, Condon, Cotton, Cotton, Crane, Dhawan, Di Matteo, Dopita, Emsellem, Fabbiano, Falcke, Falcke, Falcke, Fender, Fender, Ferrarese, Filho, Filho, Filippenko, Filippenko, Fomalont, Fosbury, Franceschini, Gebhardt, Gebhardt, Giovannini, Giovannini, H. Falcke, Heckman, Heckman, Heckman, Herrnstein, Ho, Ho, Ho, Ho, Ho, Ho, Ho, Ho, Hummel, Hummel, Hummel, Jones, Jones, Jones, Jones, Junor, Karachentsev, Kellermann, Koski, Krajnovic, Krichbaum, Kukula, Kukula, Laurent-Muehleisen, Lonsdale, Lonsdale, Lovelace, Maoz, Maoz, Marconi, Merloni, Merritt, Meurs, Middelberg, Mundell, Mundell, N. M. Nagar, Nagar, Nagar, Nagar, Nagar, Nagar, Napier, Napier, Narayan, Neff, Osterbrock, Owen, Pellegrini, Rawlings, Rees, Richstone, Sadler, Sadler, Sandage, Sanghera, Sargent, Schilizzi, Shields, Slee, Smith, Soltan, Stanger, Stoughton, Terashima, Terashima, Terlevich, Tremaine, Trotter, Ulvestad, Ulvestad, Ulvestad, Ulvestad, Ulvestad, van den Bergh, Venturi, Verdoes Kleijn, Vila, Walker, White, Woo, Wrobel, Wrobel, Wrobel, Wrobel, Xu, Zensus, Zirbel   +134 more
core   +11 more sources

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

The 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, Anil C. Seth, Jay Strader, Jenny E. Greene, Leonard Burtscher, Nadine Neumayer   +5 more
openaire   +5 more sources

Evidence That Shocks Destroy Small PAH Molecules in Low-luminosity Active Galactic Nuclei [PDF]

The Astrophysical Journal, 2022
Abstract We combined mapping-mode mid-infrared Spitzer spectra with complementary infrared imaging to perform a spatially resolved study of polycyclic aromatic hydrocarbon (PAH) emission from the central regions of 66 nearby galaxies, roughly evenly divided into star-forming systems and low-luminosity active galactic nuclei (AGNs).
Lulu Zhang, Luis C. Ho, Aigen Li
openaire   +3 more sources

EVIDENCE OF PARSEC-SCALE JETS IN LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI [PDF]

The Astrophysical Journal, 2014
The nuclear radio emission of low-luminosity active galactic nuclei (LLAGN) is often associated with unresolved cores. In this paper we show that most LLAGN present extended jet radio emission when observed with sufficient angular resolution and sensitivity. They are thus able to power, at least, parsec-scale radio jets.
Mezcua, M., Prieto, M. A.
openaire   +4 more sources