Results 21 to 30 of about 771 (176)
Why Radio Quiet Quasars are Preferred over Radio Loud Quasars Regardless of Environment and Redshift [PDF]
The Astrophysical Journal, 2020 Abstract Evidence has accumulated suggesting the clustering of radio loud quasars (RLQs) is greater than for radio quiet quasars. We interpret these results in a context in which the fraction of RLQ formation is f RLQ ≤ f RQQ compared to that for radio quiet quasars for all environments and redshifts ...
David Garofalo +3 more
openaire +3 more sources
Intranight optical variability of BL Lacs, radio-quiet quasars and radio-loud quasars [PDF]
Monthly Notices of the Royal Astronomical Society, 2005 8 pages, 3 Postscript figures, Accepted for publication in MNRAS, uses mn2e ...
Stalin, C. S. +4 more
openaire +4 more sources
Jetted radio-quiet quasars at z > 5 [PDF]
Astronomy & Astrophysics, 2021 We report on the JVLA observations of three high-redshift active galactic nuclei (AGNs) that have black hole masses estimated to be among the largest known. Two of them, SDSS J0100+2802 and SDSS J0306+1853 at redshift 6.326 and 5.363, respectively, are radio-quiet AGNs according to the classic definition, while the third (B2 1023+25 at z = 5.284) is a ...
T. Sbarrato +3 more
openaire +5 more sources
[$\ion{O}{iii}$] profile substructure in radio–quiet quasars [PDF]
Astronomy & Astrophysics, 2006 5 pages, 3 figures, accepted for publication in A& ...
Leipski, C., Bennert, N.
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Evidence for a Black Hole in a Radio-Quiet Quasar Nucleus [PDF]
The Astrophysical Journal, 1996 10 pages including 1 postscript figure; uses aaspp4.sty. Accepted for publication in Ap. J. Lett. Also available from http://www-astro.physics.ox.ac.uk/research/preprints/
Blundell, K +3 more
openaire +3 more sources
A Dichotomy in the 1–24 GHz Parsec-scale Radio Spectra of Radio-quiet Quasars
The Astrophysical JournalWe present the parsec-scale radio spectra of a representative sample of 13 Palomar–Green radio-quiet quasars, based on our new Very Long Baseline Array (VLBA) observations at 8.4 and 23.6 GHz and our earlier VLBA studies at 1.5 and 5.0 GHz.
Sina Chen +5 more
doaj +2 more sources
The Origin and Evolution of Giant Radio Galaxies
Frontiers in Astronomy and Space Sciences, 2022 Giant radio galaxies are arguably the least understood of jetted active galactic nuclei (AGN). We propose that radio galaxies are the product of large mergers that do not involve radio galaxies or radio quasars, such as in merging spiral galaxies, while ...
David Garofalo
doaj +1 more source
On the origin of radio emission in radio-quiet quasars [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 The radio emission in radio loud quasars originates in a jet carrying relativistic electrons. In radio quiet quasars (RQQs) the relative radio emission is ~10^3 times weaker, and its origin is not established yet. We show here that there is a strong correlation between the radio luminosity (L_R) and X-ray luminosity (L_X) with L_R~10^-5L_X, for the ...
Laor, Ari, Behar, Ehud
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The Nature of the IMBH Candidate CXO J133815.6+043255: High-frequency Radio Emission
The Astrophysical Journal, 2023 The ultraluminous X-ray source CXO J133815.6+043255 is a strong candidate for a bona fide intermediate-mass black hole residing in the outskirts of NGC 5252.
Krista Lynne Smith +2 more
doaj +1 more source
On the Origin of Radio Core Emission in Radio-quiet Quasars [PDF]
The Astrophysical Journal, 2007 We present a model for the radio emission from radio-quiet quasar nuclei. We show that a thermal origin for the high brightness temperature, flat spectrum point sources (known as radio ``cores'') is possible provided the emitting region is hot and optically-thin.
Blundell, K, Kuncic, Z
openaire +2 more sources