Low-luminosity active galactic nuclei

Results 91 to 100 of about 47,541 (242)

The Bochum Survey of the Southern Galactic Disk: III. Complete Data Release

Astronomische Nachrichten, Volume 347, Issue 3, March 2026.
ABSTRACT The Southern Galactic Disk Survey (GDS) monitored a mosaic of 268 fields along a 6°$$ {6}^{{}^{\circ}} $$‐wide stripe in the southern Galactic disk with simultaneous observations in r′$$ {r}^{\prime } $$ and i′$$ {i}^{\prime } $$ (7m≲r′,i′≲18m$$ {7}^{\mathrm{m}}\lesssim {r}^{\prime },{i}^{\prime}\lesssim {18}^{\mathrm{m}} $$) from September ...
Julia Blex +8 more
wiley +1 more source

XRISM/Resolve Reveals the Complex Iron Structure of NGC 7213: Evidence for Radial Stratification between Inner Disk and Broad-line Region

The Astrophysical Journal Letters
We present the first high-resolution X-ray spectrum of NGC 7213 obtained with XRISM/Resolve, supported by simultaneous XMM-Newton, NuSTAR, and SOAR optical data.
E. Kammoun +51 more
doaj +1 more source

First M87 Event Horizon Telescope Results. VII. Polarization of the Ring

The Astrophysical Journal Letters, 2021
In 2017 April, the Event Horizon Telescope (EHT) observed the near-horizon region around the supermassive black hole at the core of the M87 galaxy. These 1.3 mm wavelength observations revealed a compact asymmetric ring-like source morphology.
The Event Horizon Telescope Collaboration +240 more
doaj +1 more source

Low-Luminosity Active Galactic Nuclei at the Highest Resolution: Jets or Accretion Flows? [PDF]

, 2003
Six low-luminosity active galactic nuclei (AGNs) have been imaged at multiple frequencies from 1.7 to 43 GHz (2.3-15 GHz for three of the galaxies) using the Very Long Baseline Array.
James M. Anderson, J. Ulvestad, L. Ho
semanticscholar +1 more source

Upconversion Photoluminescence to Monitor Local Heat Release During Femtosecond Direct Laser Writing of Bioinks In Situ

Small Methods, Volume 10, Issue 4, 23 February 2026.
Upconversion nanoparticle photoluminescence was used to quantify heat burden during femtosecond direct laser writing of bioinks in real time. Transient temperature spikes above 120–140°C demonstrate the need for a stringent process optimization, and fast 20 µm/s scan speeds were established to maintain physiological conditions.
Amirbahador Zeynali, Giuseppe Chirico, Michael Heymann +2 more
wiley +1 more source

Multiwavelength Constraints on the Local Black Hole Occupation Fraction

The Astrophysical Journal
The fraction of dwarf galaxies hosting central, intermediate-mass black holes (IMBHs) at low redshifts is an important observational probe of black hole seeding at high redshift.
Colin J. Burke +3 more
doaj +1 more source

Ghost in the Shell: Evidence for Past Active Galactic Nucleus Activities in NGC 5195 from a Newly Discovered Large-scale Ionized Structure

The Astrophysical Journal, 2023
The early-type galaxy NGC 5195 (alternatively known as M51b) possesses extended gas features detected in the multiwavelength, postulated to be associated with previous activities of the central supermassive black hole.
Xiaoyu Xu, Junfeng Wang
doaj +1 more source

The Demography of Super-Massive Black Holes: Growing Monsters at the Heart of Galaxies

, 2009
Supermassive black holes (BHs) appear to be ubiquitous at the center of all galaxies which have been observed at high enough sensitivities and resolution with the Hubble Space Telescope.
Alexander +208 more
core +1 more source

Galactic Cosmic Ray Ionization on Uranus; Geomagnetic Latitude Dependencies

Journal of Geophysical Research: Planets, Volume 131, Issue 2, February 2026.
Abstract Galactic Cosmic Rays (GCRs) are a major source of atmospheric ionization, influencing ion abundance, aerosol formation, and electrical processes. GCR‐induced effects are expected to be more pronounced on Uranus than planets closer to the Sun for two reasons; reduced solar irradiance, and weaker solar modulation of incident GCR.
Ola Al‐Khuraybi, Karen L. Aplin, Alberto Gambaruto +2 more
wiley +1 more source

XRISM Reveals a Remnant Torus in the Low-luminosity AGN M81*

The Astrophysical Journal Letters
Up to 40% of galaxies in the local Universe host a low-luminosity active galactic nucleus (LLAGN), making it vital to understand this mode of black hole accretion. However, the presence or absence of Seyfert-like geometries—an accretion disk close to the
Jon M. Miller +12 more
doaj +1 more source

active galactic nuclei
fos: physical sciences
supermassive black holes

13. climate action
astrophysics astro-ph
astrophysics

accretion
x-ray active galactic nuclei
high energy astrophysical phenomena astro-ph.he