Results 101 to 110 of about 39,820 (206)

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

Multifrequency Studies of Active Galactic Nuclei in the Planck Satellite Era

Galaxies, 2016
The multi-epoch single-survey Planck satellite data have given a rare glimpse into how the radio spectra of active galactic nuclei (AGN) evolve in time.
Anne Lähteenmäki, the Planck Collaboration   +1 more
doaj   +1 more source

BASS. XLVII. 22 GHz Radio Atlas of Swift-BAT Selected AGN

The Astrophysical Journal
We present the third phase of the largest high-frequency, high-resolution imaging survey of 231 nearby, hard X-ray selected active galactic nuclei (AGNs), with a very high 98% ± 1% detection fraction.
Macon Magno, Krista L. Smith, O. Ivy Wong, Richard Mushotzky, Stuart Vogel, Michael J. Koss, Claudio Ricci, Kyuseok Oh, Chin-Shin Chang, Loreto Barcos-Muñoz, Franz E. Bauer, Alessandro Peca, Darshan Kakkad, Turgay Caglar, Benny Trakhtenbrot, Fiona Harrison, Daniel Stern, C. Megan Urry, Merry Powell   +18 more
doaj   +1 more source

TANAMI - Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry

, 2010
We present a summary of the observation strategy of TANAMI (Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry), a monitoring program to study the parsec-scale structure and dynamics of relativistic jets in active galactic nuclei (
A. K. Tzioumis, A. L. Fey, C. Müller, C. Plötz, D. J. Thompson, D. L. Jauncey, E. Ros, G. B. Taylor, G. Tosti, H. Hase, J. A. Zensus, J. E. J. Lovell, J. F. H. Quick, J. Wilms, K. J. Johnston, L. Fuhrmann, M. Böck, M. Kadler, M. Lister, M. S. Dutka, P. G. Edwards, R. A. Gaume, R. Booth, R. Ojha, S. Horiuchi, S. J. Tingay, U. Katz   +26 more
core   +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

Radio properties of the quasi-periodic eruption source RXJ1301.9+2747 at parsec scales

Astronomy & Astrophysics
Quasi-periodic eruptions (QPEs) are repeating soft X-ray flares associated with galactic nuclei. Several recent works have found evidence that the accretion flow in the galactic nuclei of QPEs is of recent origin, and that it is unlike canonical active ...
von Fellenberg S. D., Arcodia R., Benke P., Goodwin A., Kovalev Y. Y., Ros E., Janssen M., Giustini M., Miniutti G.   +8 more
doaj   +1 more source

JWST NIRCam Imaging of NGC 4258. I. Observation Overview

The Astrophysical Journal
We present James Webb Space Telescope (JWST) Near-Infrared Camera imaging of the nearby Seyfert 1.9 galaxy NGC 4258, which hosts strong star formation regions as well as an anomalous jet-like radio structure that extends through a significant portion of ...
Travis C. Fischer, Nicholas F. Cothard, Omnarayani Nayak, Henrique R. Schmitt, Erin C. Smith, Jason Glenn   +5 more
doaj   +1 more source

Evidence for Toroidal B-Field Components in AGN Jets on Kiloparsec Scales

Galaxies, 2017
Though helical magnetic fields are generally believed to arise when the jets of Active Galactic Nuclei (AGN) are launched, it is still unclear what role they play (and if they survive) to the largest jet scales.
Sebastian Knuettel, Denise Gabuzda, Shane P. O’Sullivan   +2 more
doaj   +1 more source

Gamma-ray emission from AGNs

, 2010
Blazars, radio-loud active galactic nuclei with the relativistic jet closely aligned with the line of sight, dominate the extragalactic sky observed at gamma-ray energies, above 100 MeV.
Abdo A. A., F. TAVECCHIO
core   +1 more source

Host Galaxy Evolution in Radio‐Loud Active Galactic Nuclei

The Astrophysical Journal, 2005
We investigate the luminosity evolution of the host galaxies of radio-loud active galactic nuclei (AGNs) through Hubble Space Telescope imaging of 72 BL Lac objects, including new Space Telescope Imaging Spectrograph (STIS) imaging of nine z > 0.6 BL Lacs.
Matthew O’Dowd, C. Megan Urry
openaire   +1 more source