Results 61 to 70 of about 47,541 (242)

NEUTRINO AND COSMIC-RAY EMISSION AND CUMULATIVE BACKGROUND FROM RADIATIVELY INEFFICIENT ACCRETION FLOWS IN LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI [PDF]

open access: yes, 2014
We study high-energy neutrino and cosmic-ray (CR) emission from the cores of low-luminosity active galactic nuclei (LLAGN). In LLAGN, the thermalization of particles is expected to be incomplete in radiatively inefficient accretion flows (RIAF), allowing
S. Kimura, K. Murase, K. Toma
semanticscholar   +1 more source

A ROSAT HRI survey of bright nearby galaxies [PDF]

open access: yes, 2000
We use the extensive public archive of ROSAT High Resolution Imager (HRI) observations to carry out a statistical investigation of the X-ray properties of nearby galaxies.
Brown B. A.   +37 more
core   +3 more sources

A new delivery route to Galactic Nuclei: Warm halo cloud impacts

open access: yes, 2010
We propose a new mechanism for the delivery of gas to the heart of galactic nuclei. We show that warm halo clouds must periodically impact galactic centers and potentially deliver a large (~10^{4-6} M_{solar}) mass of gas to the galactic nucleus in a ...
Blitz   +22 more
core   +1 more source

Triggering Active Galactic Nuclei in Hierarchical Galaxy Formation: Disk instability vs. Interactions [PDF]

open access: yes, 2014
Using a semi analytic model for galaxy formation we investigate the effects of Black Hole accretion triggered by disk instabilities (DI) in isolated galaxies on the evolution of AGN. Specifically, we took on, developed and expanded the Hopkins & Quataert
Fiore, F.   +3 more
core   +1 more source

Evidence for Jet Domination of the Nuclear Radio Emission in Low-Luminosity Active Galactic Nuclei [PDF]

open access: yes, 2001
We present simultaneous, subarcsecond (≤50 pc) resolution 5, 8.4, and 15 GHz Very Large Array observations of a well-defined sample of 16 low-luminosity active galactic nuclei. The radio emission in most of these nuclei does not show the rising spectrum (
N. Nagar, A. Wilson, H. Falcke
semanticscholar   +1 more source

Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign

open access: yesThe Astrophysical Journal Letters, 2021
In 2017, the Event Horizon Telescope (EHT) Collaboration succeeded in capturing the first direct image of the center of the M87 galaxy. The asymmetric ring morphology and size are consistent with theoretical expectations for a weakly accreting ...
The EHT MWL Science Working Group   +745 more
doaj   +1 more source

Multiwavelength and Environmental Properties of Variability Selected Low-luminosity Active Galactic Nuclei

open access: yesThe Astrophysical Journal
We present the multiwavelength and environmental properties of 37 variability-selected active galactic nuclei (AGNs), including 30 low-luminosity AGNs (LLAGNs), using a high cadence time-domain survey (All-Sky Automated Survey for SuperNovae) from a ...
Heechan Yuk, Xinyu Dai, Marko Mićić
doaj   +1 more source

The Stellar Populations of Low-Luminosity Active Galactic Nuclei. I. Ground-based Observations [PDF]

open access: yes, 2004
We present a spectroscopic study of the stellar populations of low-luminosity active galactic nuclei (LLAGNs). Our main goal is to determine whether the stars that live in the innermost (100 pc scale) regions of these galaxies are in some way related to ...
R. C. Fernandes   +8 more
semanticscholar   +1 more source

Deep learning Bayesian inference for low-luminosity active galactic nuclei spectra

open access: yesMonthly Notices of the Royal Astronomical Society, 2021
ABSTRACT Most active supermassive black holes in present-day galaxies are underfed and consist of low-luminosity active galactic nuclei (LLAGN). LLAGNs display complex multiwavelength broadband spectral energy distributions (SED), dominated by non-thermal processes which are explained to first order by a radiatively inefficient accretion
Ivan Almeida   +2 more
openaire   +1 more source

Controlling 3D Contractility via Engineered Fibrous Hydrogel Composites

open access: yesAdvanced Functional Materials, EarlyView.
A tunable composite contractile assembly (CCA) is developed that can permit or resist contraction without changing cell‐adhesion and density, unlike collagen whose inherent coupling of these ECM cues limits its use as a platform in contractility studies.
Karen L. Xu   +7 more
wiley   +1 more source

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