Results 101 to 110 of about 218,297 (228)

Panic at the ISCO: Time-varying Double-peaked Broad Lines from Evolving Accretion Disks Are Common among Optically Variable AGNs

The Astrophysical Journal
About 3%–10% of Type I active galactic nuclei (AGNs) have double-peaked broad Balmer lines in their optical spectra originating from the motion of gas in their accretion disk.
Charlotte Ward, Suvi Gezari, Peter Nugent, Matthew Kerr, Michael Eracleous, Sara Frederick, Erica Hammerstein, Matthew J. Graham, Sjoert van Velzen, Mansi M. Kasliwal, Russ R. Laher, Frank J. Masci, Josiah Purdum, Benjamin Racine, Roger Smith   +14 more
doaj   +1 more source

Investigating the Correlation of Outflow Kinematics with Radio Activity. VII. Gas Outflows in AGNs

The Astrophysical Journal, 2023
We explore the relationship between the ionized gas outflows and radio activity using a sample of ∼6000 active galactic nuclei (AGNs) at z < 0.4 with the kinematical measurement based on the $\left[{\rm{O}}\,{\rm\small{III}}\right]$ line profile and the ...
Ashraf Ayubinia, Jong-Hak Woo, Suvendu Rakshit, Donghoon Son   +3 more
doaj   +1 more source

A Radio Census of Binary Supermassive Black Holes [PDF]

, 2010
Using archival VLBI data for 3114 radio-luminous active galactic nuclei, we searched for binary supermassive black holes using a radio spectral index mapping technique which targets spatially resolved, double radio-emitting nuclei. Only one source was detected as a double nucleus.
arxiv   +1 more source

Impact crater lake evolution and concomitant hydrothermal mineralization recorded by the Wörnitzostheim drill core at the Ries impact structure, Germany

Meteoritics &Planetary Science, Volume 60, Issue 4, Page 795-822, April 2025.
Abstract Impact‐generated hydrothermal systems and postimpact crater lake systems are well‐documented geological phenomena; however, evidence of hydrothermal venting into impact crater lake systems has rarely been reported. We investigated the well‐preserved contact between hydrothermally altered impact melt‐bearing breccia (outer/surficial suevite ...
Matthew J. O. Svensson, Gordon R. Osinski, Fred J. Longstaffe, Timothy A. Goudge, Haley M. Sapers   +4 more
wiley   +1 more source

Multiwavelength Properties of Infrared-faint Radio Sources Based on Analysis of Their Spectral Energy Distribution

The Astrophysical Journal
Infrared-faint radio sources (IFRSs) are believed to be a rare class of radio-loud active galactic nuclei (AGNs) characterized by their high radio-to-infrared flux density ratios of up to several thousand.
Yihang Zhang, Lulu Fan, Tao An, Jun Yang, Weibin Sun, Haoran Yu, Yunkun Han   +6 more
doaj   +1 more source

Conference Summary: The Central Engine of Active Galactic Nuclei [PDF]

arXiv, 2007
The 2006 meeting in Xi'an on the Central Engine of Active Galactic Nuclei covered the enormous and continuously expanding area of AGN research, from theory to the most sophisticated observations and from gamma-ray energies to long radio wavelengths.
arxiv  

A search for FRB 121102-like persistent radio-luminous sources -- Candidates and implications for the FRB rate and searches [PDF]

, 2017
The localization of the repeating fast radio burst (FRB), FRB 121102, suggests that it is associated with a persistent radio-luminous compact source in the FRB host galaxy. Using the FIRST radio catalog, I present a search for luminous persistent sources in nearby galaxies, with radio luminosities >10% of the FRB 121102 persistent source luminosity ...
arxiv   +1 more source

Cosmic Rays and the Askaryan Effect Reveal Subsurface Structure and Buried Ice on the Moon

Geophysical Research Letters, Volume 52, Issue 6, 28 March 2025.
Abstract We present the first full‐wavelength numerical simulations of the electric field generated by cosmic ray impacts into the Moon. Billions of cosmic rays fall onto the Moon every year. Ultra‐high energy cosmic ray impacts produce secondary particle cascades within the regolith and subsequent coherent, wide‐bandwidth, linearly‐polarized radio ...
E. S. Costello, R. R. Ghent, A. Romero‐Wolf, P. W. Gorham, P. G. Lucey, C. J. Tai Udovicic, P. Linton, A. Ludwig, K. McBride, C. Miki, E. Oberla, J. Rolla, A. Jung   +12 more
wiley   +1 more source

Prevalence of Compact Nuclear Radio Emission in Post-merger Galaxies and Its Origin

The Astrophysical Journal
Post-merger galaxies are unique laboratories to study the triggering and interplay of star formation and active galactic nucleus (AGN) activity. Combining new, high-resolution Jansky Very Large Array (VLA) observations with archival radio surveys, we ...
Gregory Walsh, Sarah Burke-Spolaor
doaj   +1 more source

The Evolution of Radio Loud Active Galactic Nuclei as a Function of Black Hole Spin [PDF]

, 2010
Recent work on the engines of active galactic nuclei jets suggests their power depends strongly and perhaps counter-intuitively on black hole spin. We explore the consequences of this on the radio-loud population of active galactic nuclei and find that the time evolution of the most powerful radio galaxies and radio-loud quasars fits into a picture in ...
arxiv   +1 more source