Results 161 to 170 of about 771 (176)

Winds as the origin of radio emission in z = 2.5 radio-quiet extremely red quasars

Monthly Notices of the Royal Astronomical Society, 2018
Most active galactic nuclei (AGNs) are radio quiet, and the origin of their radio emission is not well understood. One hypothesis is that this radio emission is a byproduct of quasar driven winds.
Hsiang-Chih Hwang, Nadia L Zakamska, Rachael M Alexandroff   +2 more
exaly   +2 more sources

Radio-loud and radio-quiet quasars observed by EXOSAT [PDF]

Monthly Notices of the Royal Astronomical Society, 1992
We present results from the spectral analysis of EXOSAT data on 31 quasars, 18 radio-loud and 13 radio-quiet. Simple power-law models with fixed (Galactic) absorption give acceptable fits to the spectra obtained in the 2-10 keV band. Using the results from these fits we have compared the distributions of spectral indices α for the radio-loud and radio ...
M J L Turner, G C Stewart, R D Saxton
exaly   +2 more sources

Polarimetric and spectroscopic study of radio-quiet weak emission line quasars

Monthly Notices of the Royal Astronomical Society, 2018
International audienceA small subset of optically selected radio-quiet quasars showing weak or no emission lines may turn out to be the elusive radio-quiet BL Lac objects, or simply be radio-quiet QSOs with a still-forming/shielded broad line region (BLR)
R Srianand, C S Stalin, P Petitjean
exaly   +2 more sources

Outflow-related radio emission in radio-quiet quasars

Monthly Notices of the Royal Astronomical Society
ABSTRACT In this work, we revisit the relationship between [O iii] line width w90 (as the indicator of active galactic nucleus outflow velocity) and the radio emission in radio-quiet quasars (RQQs) by employing a large sample of Type I quasars (∼37 000) selected from the Sloan Digital Sky Survey (SDSS) Data Release 16. By median stacking
Mai Liao, Jun-Xian Wang, Wenke Ren
exaly   +3 more sources

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X-ray properties of high-redshift Radio Loud and Radio Quiet Quasars observed by Chandra

Journal of High Energy Astrophysics, 2022
F Shaban, Aneta Siemiginowska, A Ali
exaly  

Merger Signatures in Radio Loud and Radio Quiet Quasars

Acta Astronomica, 2020
Garofalo, D., Webster, B., Bishop, K.
openaire   +1 more source

Exploring the connection between ultraviolet/optical variations and radio emission in radio-quiet quasars: clues about the origin of radio emission

Monthly Notices of the Royal Astronomical Society, 2022
Mai Liao, Jun-Xian Wang, Wen-Yong Kang   +2 more
exaly  

What drives the radio slopes in radio-quiet quasars?

Monthly Notices of the Royal Astronomical Society, 2019
Ari Laor, R D Baldi, Ehud BÉHAR
exaly  

Star formation in quasar hosts and the origin of radio emission in radio-quiet quasars

Monthly Notices of the Royal Astronomical Society, 2016
Nadia L Zakamska, D Dicken, Ryan C Hickox   +2 more
exaly  

Covering factors of the dusty obscurers in radio-loud and radio-quiet quasars

Monthly Notices of the Royal Astronomical Society, 2016
Maitrayee Gupta, Marek Sikora, Krzysztof Nalewajko   +2 more
exaly