Results 91 to 100 of about 796,792 (175)

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

Revealing the Physical Driver of the Baldwin Effect: Gas Density in the Broad-line Region

The Astrophysical Journal
The Baldwin effect—the inverse correlation between the equivalent width of emission lines and the continuum luminosity in active galactic nuclei (AGNs)—has been known for nearly five decades, yet its physical origin remains poorly understood.
Wen-Qiang Liang, Zhi-Fu Chen, Rui-Jing Lu, Cheng-Feng Peng, Shao-Hua Zhang, Zhe-Geng Chen, Zhi-Qing Chen, Yi-Qi Chen, Dong-Li Jiang, Xi-Heng Shi, Zhi-Wen Wang   +10 more
doaj   +1 more source

How many radio-loud quasars can be detected by the gamma-ray large area space telescope?

, 2008
In the unification scheme, radio quasars and FR II radio galaxies come from the same parent population, but viewed at different angles. Based on the Comptonization models for the gamma-ray emission from active galactic nuclei (AGNs), we estimate the ...
Bai, J. M., Cao, Xinwu
core  

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

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

Correlation between extended radio and line emission for a radio-loud quasar sample

, 2001
A strong correlation is present between the extended radio and broad-line emission for a radio-loud quasar sample. The statistic behaviour on the core emission of lobe-dominated quasars is rather different from that of core-dominated quasars.
Schilizzi, RT, Vogel, SN, Elvis, MS, Jiang, DR, Paresce, F, Cao, XW   +5 more
core  

Exploring the radio loudness of SDSS quasars with spectral stacking

Monthly Notices of the Royal Astronomical Society
ABSTRACT We use new 144 MHz observations over 5634 deg2 from the LOFAR (Low Frequency Array) Two-metre Sky Survey (LoTSS) to compile the largest sample of uniformly selected, spectroscopically confirmed quasars from the 14th data release of the Sloan Digital Sky Survey (SDSS-DR14).
M I Arnaudova, D J B Smith, M J Hardcastle, S Das, A Drake, K Duncan, G Gürkan, M Magliocchetti, L K Morabito, J W Petley, S Shenoy, C Tasse   +11 more
openaire   +3 more sources

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

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

The Radio‐Loud Narrow‐Line Quasar SDSS J172206.03+565451.6

The Astrophysical Journal, 2006
We report identification of the radio loud narrow-line quasar SDSS J172206.03+565451.6 which we found in the course of a search for radio loud narrow-line Active Galactic Nuclei (AGN). SDSSJ172206.03+565451.6 is only the ~4th securely identified radio loud narrow-line quasar and the second-most radio loudest with a radio index R_1.4 ~ 100-700.
Komossa, S., Voges, W., Adorf, H., Xu, D., Mathur, S., Anderson, S.   +5 more
openaire   +3 more sources