Results 51 to 60 of about 183 (149)
[C ii] Properties and Far-infrared Variability of a z = 7 Blazar
The Astrophysical Journal LettersWe present millimeter observations of the host galaxy of the most distant blazar known, VLASS J041009.05−013919.88 (hereafter J0410–0139) at z = 7, using Atacama Large Millimeter/submillimeter Array (ALMA) and NOrthern Extended Millimeter Array (NOEMA ...
Eduardo Bañados +9 more
doaj +1 more source
Jet Physics of Accreting Super-Massive Black Holes in the Era of the Fermi Gamma-ray Space Telescope
Frontiers in Astronomy and Space Sciences, 2017 The Fermi Gamma-ray Space Telescope with its main instrument on-board, the Large Area Telescope (LAT), opened a new era in the study of high-energy emission from Active Galactic Nuclei (AGN).
Filippo D'Ammando, Filippo D'Ammando
doaj +1 more source
Radio-loud Narrow-Line Type 1 Quasars [PDF]
The Astronomical Journal, 2006 We present the first systematic study of (non-radio-selected) radio-loud narrow-line Seyfert 1 (NLS1) galaxies. Cross-correlation of the `Catalogue of Quasars and Active Nuclei' with several radio and optical catalogues led to the identification of 11 radio-loud NLS1 candidates including 4 previously known ones. Most of the radio-loud NLS1s are compact,
Komossa, S. +7 more
openaire +4 more sources
Impact of Radio-mode Feedback on the Covering Fraction of the Circumgalactic Medium of Quasars
The Astrophysical JournalUtilizing data from the Low-Frequency Array Two-meter Sky Survey and the Sloan Digital Sky Survey, we assemble a sample of 1469 projected quasar pairs with detected radio emissions from foreground quasars, as well as a control sample of 5846 pairs ...
Wen-Qiang Liang +4 more
doaj +1 more source
A Powerful Radio-loud Quasar at the End of Cosmic Reionization [PDF]
The Astrophysical Journal Letters, 2018 Abstract We present the discovery of the radio-loud quasar PSO J352.4034–15.3373 at z = 5.84 ± 0.02. This quasar is the radio brightest source known, by an order of magnitude, at z ∼ 6 with a flux density in the range of 8–100 mJy from 3 GHz to 230 MHz and a radio loudness parameter
Eduardo Bañados +7 more
openaire +4 more sources
The Detection Rate of Associated Mg ii Absorption Lines in Quasars Depends on Their Radio Emission
The Astrophysical JournalIn active galactic nuclei, jet-driven feedback plays a significant role in influencing the properties of gas within their host galaxy and the circumgalactic medium.
Zhi-Fu Chen, Luis C. Ho
doaj +1 more source
Intra-Day Variability Observations of Two Dozens of Blazars at 4.8 GHz
Universe, 2021 Two dozens of radio loud active galactic nuclei (AGNs) have been observed with Urumqi 25 m radio telescope in order to search for intra-day variability (IDV).
Xiang Liu +6 more
doaj +1 more source
IRAS observations of radio-quiet and radio-loud quasars
The Astrophysical Journal, 1984 Observations from 12 to 100 microns are presented of two radio-quiet and three radio-loud quasars. Over this wavelength range, all five have grossly similar continuum energy distributions. The continua of the radio-loud quasars are consistent with synchrotron radiation.
Neugebauer, G. +9 more
openaire +3 more sources
The Astrophysical JournalOQ 208 is a nearby, partially obscured quasar ( z = 0.077) that is a young, bright, parsec-scale radio source. We assemble archival and new high-frequency Very Long Baseline Array (VLBA) and Very Large Array (VLA) observations and optical spectra to form
Brian Punsly +14 more
doaj +1 more source
The cluster environments of radio loud quasars
, 2001 5 pages, 3 figures, contribution to "Tracing Cosmic Evolution with Galaxy Clusters" (Sesto 2001), ASP Conference ...
Barr, J. +3 more
openaire +3 more sources