Results 101 to 110 of about 40,224 (203)

VLA FRAMEx. I. Wideband Radio Properties of the AGN in NGC 4388

The Astrophysical Journal
We present the first results from Karl G. Jansky Very Large Array (VLA) observations as a part of the Fundamental Reference Active Galactic Nucleus (AGN) Monitoring Experiment, a program to understand the relationship between AGN accretion physics and ...
Andrew J. Sargent, Travis C. Fischer, Megan C. Johnson, Alexander J. van der Horst, Nathan J. Secrest, Onic I. Shuvo, Phil J. Cigan, Krista L. Smith   +7 more
doaj   +1 more source

A Radio View of the Sky: the Cosmic History of Star-Forming and AGN Galaxies [PDF]

, 2009
We explore the cosmic evolution of radio detected star forming (SF) galaxies and active galactic nuclei (AGN), drawn from the VLA-COSMOS survey, out to z = 1.3.
Schinnerer, E., Smolčić, V., Zamorani, G.   +2 more
core  

Quantitative Stain Mapping in X‐Ray Virtual Histology

Advanced Science, Volume 13, Issue 21, 13 April 2026.
Virtual histology promises 3D tissue examination without physical sectioning, yet has lacked the tissue‐specificity of conventional pathology. This work demonstrates the first quantitative three‐dimensional stain mapping at histologically relevant resolution, separating contrast agent from tissue to reveal cellular features such as nuclei. The approach
Dominik John, David M. Paganin, Marie‐Christine Zdora, Lisa Marie Petzold, Patrick Ilg, Junan Chen, Sara Baggio, Johannes B. Thalhammer, Sami Wirtensohn, Julian Moosmann, Jörg U. Hammel, Felix Beckmann, Samantha J. Alloo, Jannis N. Ahlers, Madleen Busse, Julia Herzen, Kaye S. Morgan   +16 more
wiley   +1 more source

Black hole masses and starbursts in X-shaped radio sources

, 2011
It has been suggested that the X-shaped morphology observed in some radio sources can reflect either a recent merger of two supermassive black holes (SMBHs) or the presence of a second active black hole in the galactic nucleus. These scenarios are tested
A. P. Lobanov, Adelman-McCarthy, Antonucci, Asari, Becker, Bruzual, Capetti, Cardelli, Cheung, Cheung, Cid Fernandes, Cid Fernandes, Cid Fernandes, de Vries, Dennett-Thorpe, Dokuchaev, Efstathiou, Frenk, Gebhardt, Gergely, González-Serrano, Gopal-Krishna, Biermann, Hodges-Kluck, Hodges-Kluck, Hopkins, Hutchings, Hutchings, J. León-Tavares, Kaspi, Kaspi, Lal, Lal, Landt, Landt, Leahy, Lobanov, M. Mezcua, Mack, Marcha, Marchesini, Mateus, Merritt, Merritt, Nelson, Parma, Plotkin, Rees, Sanders, Schlegel, Stocke, Strateva, Tingay, Toomre, Tremaine, V. H. Chavushyan, Wang, Wu   +56 more
core   +1 more source

Optical Spectra of Radio-Loud and Radio-Quiet Active Galactic Nuclei [PDF]

Symposium - International Astronomical Union, 1982
Many radio galaxies have strong emission lines in their optical spectra. The fraction with such lines is much larger than in “normal” galaxies. Radio galaxies generally also have very bright nuclei; thus those with strong emission lines are similar in both respects to Seyfert galaxies.
openaire   +1 more source

Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the String‐Theoretical Swampland Programme

Fortschritte der Physik, Volume 74, Issue 4, April 2026.
Abstract String theory has strong implications for cosmology, implying the absence of a cosmological constant, ruling out single‐field slow‐roll inflation, and that black holes decay. The origins of these statements are elucidated within the string‐theoretical swampland programme.
Kay Lehnert
wiley   +1 more source

An Excess of Active Galactic Nuclei Triggered by Galaxy Mergers in MaNGA Galaxies of Stellar Mass ∼1011 M ⊙

The Astrophysical Journal
To facilitate new studies of galaxy-merger-driven fueling of active galactic nuclei (AGNs), we present a catalog of 387 AGNs that we have identified in the final population of over 10,000 z < 0.15 galaxies observed by the Sloan Digital Sky Survey-IV ...
Julia M. Comerford, Rebecca Nevin, James Negus, R. Scott Barrows, Michael Eracleous, Francisco Müller-Sánchez, Namrata Roy, Aaron Stemo, Thaisa Storchi-Bergmann, Dominika Wylezalek   +9 more
doaj   +1 more source

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

Probing the High-frequency Variability of NGC 5044: The Key to Active Galactic Nucleus Feedback

The Astrophysical Journal
The active galactic nucleus (AGN) feeding and feedback process in the centers of galaxy clusters and groups is still not well understood. NGC 5044 is the ideal system in which to study AGN feedback. It hosts the largest known reservoir of cold gas in any
Gerrit Schellenberger, Ewan O’Sullivan, Laurence P. David, Jan Vrtilek, Charles Romero, Glen Petitpas, William Forman, Simona Giacintucci, Mark Gurwell, Christine Jones, Kamlesh Rajpurohit, Francesco Ubertosi, Tiziana Venturi   +12 more
doaj   +1 more source

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

, 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   +1 more source