Observational Constraints on Direct Electron Heating in the Hot Accretion Flows in Sgr A* and M87*
The 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
Spectral Models for Low-luminosity Active Galactic Nuclei in LINERs: The Role of Advection-dominated Accretion and Jets [PDF]
, 2013 We perform an exploratory study of the physical properties of accretion ows and jets in low-luminosity active galactic nuclei (LLAGNs) by modeling the spectral energy distributions (SEDs) of 12 LLAGNs in low-ionization nuclear emission-line regions ...
R. Nemmen +2 more
semanticscholar +1 more source
Ultra-high-energy cosmic rays from low-luminosity active galactic nuclei [PDF]
Astroparticle 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
The largest black holes and the most luminous galaxies [PDF]
, 2002 The empirical relationship between the broad line region size and the source luminosity in active galactic nuclei (AGNs) is used to obtain black holes (BH) masses for a large number of quasars in three samples. The largests BH masses found exceed 10^{10}
Hagai Netzer, Kormendy J.
core +2 more sources
Possible Evidence for Truncated Thin Disks in the Low-Luminosity Active Galactic Nuclei M81 and NGC 4579 [PDF]
Astrophysical Journal, 1999 M81 and NGC 4579 are two of the few low-luminosity active galactic nuclei that have an estimated mass for the central black hole, detected hard X-ray emission, and detected optical/UV emission.
E. Quataert +3 more
semanticscholar +1 more source
The Spectral Energy Distributions of Low‐Luminosity Active Galactic Nuclei [PDF]
The Astrophysical Journal, 1999 To appear in The Astrophysical Journal.
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EVN observations of low-luminosity flat-spectrum active galactic nuclei [PDF]
Monthly 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
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The dust origin of the Broad Line Region and the model consequences for AGN unification scheme [PDF]
, 2015 We propose a very simple physical mechanism responsible for the formation of the Low Ionization Line part of the Broad Line Region in Active Galactic Nuclei.
Adhikari, Tek P. +9 more
core +1 more source
Dusty spirals versus gas kinematics in the inner kiloparsec of four low-luminosity active galactic nuclei [PDF]
, 2017 We used the Gemini Multi-Object Spectrograph Integral Field Unit to map the gas distribution, excitation and kinematics within the inner kiloparsec of four nearby low-luminosity active galaxies: NGC3982, NGC4501, NGC2787 and NGC4450.
C. Brum +5 more
semanticscholar +1 more source
Close stars and accretion in low-luminosity active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2004 Quasar accretion disks are believed to form stars by self-gravity. Low Luminosity Active Galactic Nuclei (LLAGN) are much dimmer galactic centers, and are often believed to be quasars that ran out of gaseous fuel. LLAGN accretion disks should thus co-exist with thousands to millions of stars or proto-stars left from the previous stronger accretion ...
openaire +4 more sources