Results 61 to 70 of about 796,792 (175)

[C ii] Properties and Far-infrared Variability of a z = 7 Blazar

The Astrophysical Journal Letters
We 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, Yana Khusanova, Roberto Decarli, Emmanuel Momjian, Fabian Walter, Thomas Connor, Christopher L. Carilli, Chiara Mazzucchelli, Sofía Rojas-Ruiz, Bram P. Venemans   +9 more
doaj   +1 more source

PG 1004+130: Hybrid Morphology Source or a Restarted FRII? A uGMRT Polarimetric Investigation

The Astrophysical Journal, 2023
We present the polarization image of the hybrid morphology and broad absorption line quasar PG 1004+130 at 694 MHz obtained with the upgraded Giant Metrewave Radio Telescope. We detect linear polarization in this source’s core, jets, and lobes.
Salmoli Ghosh, P. Kharb, J. Baghel, S. Silpa   +3 more
doaj   +1 more source

An ALMA View of the Host Galaxies of Radio-Loud Quasars at z>5

, 2022
The last few years have seen a true Golden Age for the discovery and characterization of luminous quasars at the highest redshifts (z>5, within 1Gyr from the Big Bang, i.e. in the Epoch of Reionization); ~10% of such quasars are classified as radio-loud,
Bañados, Eduardo, Mazzucchelli, Chiara, Emanuele Paolo Farina, Khusanova, Yana, Decarli, Roberto, Rojas-Ruiz, Sofía   +5 more
core   +1 more source

Broad absorption line variability in radio-loud quasars [PDF]

Monthly Notices of the Royal Astronomical Society, 2014
We investigate C IV broad absorption line (BAL) variability within a sample of 46 radio-loud quasars (RLQs), selected from SDSS/FIRST data to include both core-dominated (39) and lobe-dominated (7) objects. The sample consists primarily of high-ionization BAL quasars, and a substantial fraction have large BAL velocities or equivalent widths; their ...
Welling, C. A., Miller, B. P., Brandt, W. N., Capellupo, D. M., Gibson, R. R.   +4 more
openaire   +2 more sources

The Far-Infrared emission of Radio Loud and Radio Quiet Quasars

, 2017
Continuum observations at radio, millimetre, infrared and soft X-ray energies are presented for a sample of 22 quasars, consisting of flat and steep spectrum radio loud, radio intermediate and radio quiet objects.
Wilkes, Belinda, Courvoisier, T.J.-L., Hooper, E.J., Polletta, M.   +3 more
core   +6 more sources

Impact of Radio-mode Feedback on the Covering Fraction of the Circumgalactic Medium of Quasars

The Astrophysical Journal
Utilizing 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, Zhi-fu Chen, Rui-Jing Lu, Jing Li, Zhe-Geng Chen   +4 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

On the Cosmological Evolution of Radio Quiet and Radio Loud Quasars [PDF]

Symposium - International Astronomical Union, 1996
This contribution gives further insight into the problem of an ‘evolution’ of the function G(> R) [R is the ratio between radio and optical luminosity of a QSO] suggested by Visnovsky et al.(1992,ApJ,391,560), and recently by Schmidt et al.(1995,AJ,109,473). Using the Optical Luminosity Function for optically selected quasars derived by Boyle et al.(
openaire   +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., Voges, W., Xu, D., Mathur, S., Adorf, H., Lemson, G., Duschl, W., Grupe, D.   +7 more
openaire   +4 more sources

The Detection Rate of Associated Mg ii Absorption Lines in Quasars Depends on Their Radio Emission

The Astrophysical Journal
In 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