Results 101 to 110 of about 40,003 (204)
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. +2 more
core
Radio Near-infrared Imaging of Dual Active Galactic Nuclei Candidates
The Astrophysical JournalWe report the results of a pilot study that searched for dual active galactic nuclei (AGN) in local ( z 10 ^8 K) radio sources that indicate the presence of either a parsec-scale-separation dual AGN ( d _sep ∼ 90 and ∼56 pc, respectively) or a radio ...
Makoto A. Johnstone +15 more
doaj +1 more source
, 2004 BL Lac objects are an elusive and rare class of active galactic nuclei. For years their evolutionary behavior has appeared inconsistent with the trend observed in the population of AGN at large.
Cavallotti, Francesca +3 more
core +2 more sources
The Astrophysical JournalInfrared-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 +6 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 +1 more
doaj +1 more source
Probing the High-frequency Variability of NGC 5044: The Key to Active Galactic Nucleus Feedback
The Astrophysical JournalThe 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 +12 more
doaj +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
BASS. XLVII. 22 GHz Radio Atlas of Swift-BAT Selected AGN
The Astrophysical JournalWe 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 +18 more
doaj +1 more source
Prevalence of Compact Nuclear Radio Emission in Post-merger Galaxies and Its Origin
The Astrophysical JournalPost-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
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 +2 more
doaj +1 more source