Results 81 to 90 of about 719 (181)

Discovery of a Radio-loud/Radio-quiet Binary Quasar

The Astrophysical Journal, 1999
8 pages, 3 figures, to appear in Astrophysical Journal ...
Brotherton, M. S., Gregg, Michael D., Becker, R. H., Laurent-Muehleisen, S. A., White, R. L., Stanford, S. A.   +5 more
openaire   +2 more sources

The Jet-Disk Coupling of Seyfert Galaxies from a Complete Hard X-ray Sample

Universe, 2020
We analyze the jet-disk coupling for different subsamples from a complete hard X-ray Seyfert sample to study the coupling indices and their relation to accretion rate.
Xiang Liu, Ning Chang, Zhenhua Han, Xin Wang   +3 more
doaj   +1 more source

Unveiling New Giant Radio Quasars from the TGSS Sky and Their Large-scale Environment

The Astrophysical Journal Supplement Series
Giant radio quasars (GRQs) are radiatively efficient radio-loud active galactic nuclei that propel large-scale radio jets with projected lengths of more than 0.7 Mpc. We report the discovery of 53 new GRQs within a redshift range of 0.14–2.38, as well as
Souvik Manik, Netai Bhukta, Sabyasachi Pal, Sushanta K. Mondal   +3 more
doaj   +1 more source

Red companions to a z=2.15 radio-loud quasar [PDF]

Monthly Notices of the Royal Astronomical Society, 2000
We have conducted observations of the environment around the z=2.15 radio loud quasar 1550-269 in search of distant galaxies associated either with it or the z=2.09 CIV absorber along its line of sight. Such objects will be distinguished by their red colours, R-K>4.5.
openaire   +2 more sources

Investigating the Emission Mechanism in the Spatially Resolved Jets of Two z ≈ 3 Radio-loud Quasars

The Astrophysical Journal
This study focuses on high-redshift, z > 3, quasars where resolved X-ray jets remain underexplored in comparison to nearby sources. Building upon previous work, we identify and confirm extended kiloparsec-scale jets emission in two quasars (J1405+0415, z
Jaya Maithil, Daniel A. Schwartz, Aneta Siemiginowska, Preeti Kharb, Diana M. Worrall, John F. C. Wardle, Giulia Migliori, Chi C. Cheung, Bradford Snios, Doug B. Gobeille, Herman L. Marshall, Mark Birkinshaw   +11 more
doaj   +1 more source

Discovery of spectacular quasar-driven superbubbles in red quasars. [PDF]

Sci Adv, 2023
Shen L, Liu G, He Z, Zakamska NL, Glikman E, Greene JE, Hu W, Mou G, Wylezalek D, Rupke DSN.   +9 more
europepmc   +1 more source

Diverse Molecular Gas Excitations in Quasar Host Galaxies at z ∼ 6

The Astrophysical Journal
We present observations using the Northern Extended Millimetre Array (NOEMA) of CO and H _2 O emission lines and the underlying dust continuum in two quasars at z ∼ 6, i.e., P215−16 at z = 5.78 and J1429+5447 at z = 6.18.
Jianan Li, Ran Wang, Antonio Pensabene, Fabian Walter, Bram P. Venemans, Roberto Decarli, Eduardo Bañados, Pierre Cox, Roberto Neri, Alain Omont, Zheng Cai, Yana Khusanova, Fuxiang Xu, Dominik Riechers, Jeff Wagg, Yali Shao, Yuanqi Liu, Karl M. Menten, Qiong Li, Xiaohui Fan   +19 more
doaj   +1 more source

First Measurements of Black Hole Accretion and Radio-jet Timescales in a Young Quasar at the Edge of Reionization

The Astrophysical Journal
We present the first study dedicated to measuring the timescales for black hole accretion and jet launching in a quasar at the edge of reionization, PSO J352.4034–15.3373 at z = 5.832 ± 0.001.
Sofía Rojas-Ruiz, Emmanuel Momjian, Frederick B. Davies, Eduardo Bañados, Anna-Christina Eilers, Sarah B. Bosman, Bhargav Vaidya, Chris Carilli, Chiara Mazzucchelli, Thomas Connor, Yana Khusanova   +10 more
doaj   +1 more source

High-Redshift Quasars at z ≥ 3—III: Parsec-Scale Jet Properties from Very Long Baseline Interferometry Observations

Universe
High-redshift active galactic nuclei (AGN) provide key insights into early supermassive black hole growth and cosmic evolution. This study investigates the parsec-scale properties of 86 radio-loud quasars at z ≥ 3 using very long baseline interferometry (
Shaoguang Guo, Tao An, Yuanqi Liu, Chuanzeng Liu, Zhijun Xu, Yulia Sotnikova, Timur Mufakharov, Ailing Wang   +7 more
doaj   +1 more source

Evidence for quasar fast outflows being accelerated at the scale of tens of parsecs. [PDF]

Sci Adv, 2022
He Z, Liu G, Wang T, Mou G, Green R, Bian W, Wang H, Ho LC, Sun M, Shen L, Arav N, Chen C, Wu Q, Guo H, Lin Z, Li J, Yi W.   +16 more
europepmc   +1 more source