Results 31 to 40 of about 47,541 (242)

Soft gamma rays from low accreting supermassive black holes and connection to energetic neutrinos [PDF]

Nature Communications, 2021
The origins of the soft gamma-ray and high-energy neutrino backgrounds remain unknown. Here, the authors show radiatively inefficient accretion flows of low-luminosity active galactic nuclei can produce the soft gamma ray and high energy neutrino ...
Shigeo S. Kimura, Kohta Murase, Péter Mészáros   +2 more
doaj   +2 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 (LLAGNs) is often associated with unresolved cores. In this paper we show that most LLAGNs present extended jet radio emission when observed with sufficient angular resolution and ...
M. Mezcua, M. Prieto
semanticscholar   +4 more sources

Radio Sources in Low-Luminosity Active Galactic Nuclei. I. VLA Detections of Compact, Flat-Spectrum Cores [PDF]

, 2000
We report a 0.2" resolution, 15 GHz survey of a sample of 48 low-luminosity active galactic nuclei with the Very Large Array. Compact radio emission has been detected in 57% (17 of 30) of LINERs and low-luminosity Seyferts, at least 15 of which have a ...
Andrew S. Wilson, de Bruyn A. G., Falcke H., Falcke H., Fosbury R. A. E., Graham D. A., Heckman T. M., Heckman T. M., Heino Falcke, Hummel E., Hummel E., Hummel E., Keel W. C., Luis C. Ho, Neil M. Nagar, Peng C. Y., Pringle J. E., Sadler E. M., Sadler E. M., Slee O. B., Stanger V. J., Terlevich R., Terlevich R., Unger S. W., Vila M. B.   +24 more
core   +2 more sources

VARIABILITY-SELECTED LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI IN THE 4 Ms CHANDRA DEEP FIELD-SOUTH [PDF]

The Astrophysical Journal, 2012
The 4 Ms Chandra Deep Field-South (CDF-S) and other deep X-ray surveys have been highly effective at selecting active galactic nuclei (AGNs). However, cosmologically distant low-luminosity AGNs (LLAGNs) have remained a challenge to identify due to ...
M. Young, W. Brandt, Yongquan Xue, M. Paolillo, D. Alexander, F. Bauer, F. Bauer, B. Lehmer, B. Lehmer, B. Luo, O. Shemmer, D. Schneider, C. Vignali   +12 more
semanticscholar   +11 more sources

Compact jets dominate the continuum emission in low-luminosity active galactic nuclei [PDF]

Astronomy & Astrophysics, 2022
Low-luminosity active galactic nuclei (LLAGN) are special among their kind due to the profound structural changes that the central engine experiences at low accretion rates ( (cid:46) 10 − 3 in Eddington units).
J. Fernández-Ontiveros, X. López-López, A. Prieto   +2 more
semanticscholar   +1 more source

Millimeter-VLBI Observations of Low-luminosity Active Galactic Nuclei with Source-frequency Phase Referencing [PDF]

Astrophysical Journal Letters, 2021
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.
Wu Jiang, Zhiqiang Shen, I. Martí-Vidal, Xuezheng Wang, D. Jiang, N. Kawaguchi   +5 more
semanticscholar   +1 more source

Variability Selected Active Galactic Nuclei from ASAS-SN Survey: Constraining the Low Luminosity AGN Population [PDF]

Astrophysical Journal, 2022
Low luminosity active galactic nuclei (LLAGN) probe accretion physics in the low Eddington regime can provide additional clues about galaxy evolution. AGN variability is ubiquitous and thus provides a reliable tool for finding AGN. We analyze the All-Sky
H. Yuk, X. Dai, T. Jayasinghe, H. Fu, Hora D. Mishra, C. Kochanek, B. Shappee, K. Oklahoma, The Ohio State University, U. Iowa, University of Hawai'i   +10 more
semanticscholar   +1 more source

Low-luminosity radio-loud active galactic nuclei [PDF]

Proceedings of 8th European VLBI Network Symposium — PoS(8thEVN), 2007
I review observational properties of low power radio loud AGN. High resolution VLBI observations allow the estimate of the jet velocity and orientation with respect to the line of sight and the determination of the Doppler factor. These data reveal rich structures, including two-sided jets and secondary components. New results on 1144+35, a giant radio
Giovannini, Gabriele, Giroletti, Marcello   +1 more
openaire   +3 more sources

AMUSE-Antlia. I. Nuclear X-Ray Properties of Early-type Galaxies in a Dynamically Young Galaxy Cluster

The Astrophysical Journal, 2023
To understand the formation and growth of supermassive black holes (SMBHs) and their coevolution with host galaxies, it is essential to know the impact of environment on the activity of active galactic nuclei (AGNs).
Zhensong Hu, Yuanyuan Su, Zhiyuan Li, Kelley M. Hess, Ralph P. Kraft, William R. Forman, Paul E. J. Nulsen, Sarrvesh S. Sridhar, Andra Stroe, Junhyun Baek, Aeree Chung, Dirk Grupe, Hao Chen, Jimmy A. Irwin, Christine Jones, Scott W. Randall, Elke Roediger   +16 more
doaj   +1 more source

A Population of Bona Fide Intermediate-mass Black Holes Identified as Low-luminosity Active Galactic Nuclei [PDF]

Astrophysical Journal, 2018
Nearly every massive galaxy harbors a supermassive black hole (SMBH) in its nucleus. SMBH masses are millions to billions of solar mass, and they correlate with properties of spheroids of their host galaxies.
I. Chilingarian, I. Katkov, I. Zolotukhin, K. Grishin, Y. Beletsky, K. Boutsia, D. Osip   +6 more
semanticscholar   +1 more source