Results 111 to 120 of about 40,003 (204)

Induced Compton Scattering in Gigahertz Peak Spectrum Sources

, 1997
We revisit the shocked shell model for the class of Active Galactic Nuclei known as Gigahertz Peak Spectrum sources, incorporating new observational data on the radiation brightness temperatures. We argue that in addition to free-free absorption, induced
Coppi P., Fanti R., Geoffrey V. Bicknell, Levinson A., Michael A. Dopita, Sunyaev R. A., Zdenka Kuncic   +6 more
core   +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

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

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

Fast radio bursts in the discs of active galactic nuclei

Monthly Notices of the Royal Astronomical Society
ABSTRACT Fast radio bursts (FRBs) are luminous millisecond-duration radio pulses with extragalactic origin, which were discovered more than a decade ago. Despite the numerous samples, the physical origin of FRBs remains poorly understood. FRBs have been thought to originate from young magnetars or accreting compact objects (COs). Massive
Z Y Zhao, K Chen, F Y Wang, Zi-Gao Dai
openaire   +2 more sources

A Morphological Identification and Study of Radio Galaxies from LoTSS DR2. I. The “Winged” Radio Galaxies

The Astrophysical Journal Supplement Series
We conducted an extensive identification and analysis of various morphological classes and subclasses of radio galaxies using the latest high-resolution data from the second data release of the LOFAR Two-metre Sky Survey.
Soumen Kumar Bera, Taotao Fang, Tapan K. Sasmal, M. Kunert-Bajraszewska, Xuelei Chen, Soumen Mondal   +5 more
doaj   +1 more source

Radio Properties of Low Redshift Broad Line Active Galactic Nuclei Including Extended Radio Sources

, 2010
We present a study of the extended radio emission in a sample of 8434 low redshift (z < 0.35) broad line active galactic nuclei (AGN) from the Sloan Digital Sky Survey (SDSS).
Antonucci, Bentz, Blandford, Chiaberge, Cirasuolo, D. Michael Crenshaw, Elvis, Fanaroff, Gopal-Krishna, Gopal-Krishna, Gopal-Krishna & Wiita, Greene, Ho, Ivezić, Ivezić, Kaspi, Kaspi, Kawakatu, Laor, Laor, Osterbrock, Paul J. Wiita, Peterson, Rafter, Rafter, Saripalli, Sikora, Spergel, Stephen E. Rafter, White   +29 more
core   +1 more source

Recognizing Blazars Using Radio Morphology from the VLA Sky Survey

The Astrophysical Journal
Blazars are radio-loud active galactic nuclei whose jets have a very small angle to our line of sight. Observationally, the radio emissions are mostly compact or compact-core with a one-sided jet.
Zhang-Liang Xie, Eduardo Bañados, Silvia Belladitta, Chiara Mazzucchelli, Jan-Torge Schindler, Frederick Davies, Bram P. Venemans   +6 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

VaDAR: Varstrometry for Dual AGN Using Radio Interferometry

The Astrophysical Journal
Binary and dual active galactic nuclei (AGNs) are an important observational tool for studying the formation and dynamical evolution of galaxies and supermassive black holes.
Emma Schwartzman, Tracy E. Clarke, Kristina Nyland, Nathan J. Secrest, Ryan W. Pfeifle, Henrique Schmitt, Shobita Satyapal, Barry Rothberg   +7 more
doaj   +1 more source