Results 1 to 10 of about 796,792 (175)
The central engines of radio-loud quasars [PDF]
Astronomy & Astrophysics, 2003 We have assembled a sample of 37 radio-loud quasars that have been imaged with the Hubble Space Telescope in order to investigate their black hole masses, accretion rates, and the structure of their accretion disks.
R. Staubert, L. C. Ho, J.-M. Wang
core +3 more sources
Radio Variability of Radio Quiet and Radio Loud Quasars [PDF]
The Astrophysical Journal, 2004 The majority of quasars are weak in their radio emission, with flux densities comparable to those in the optical, and energies far lower. A small fraction, about 10%, are hundreds to thousands of times stronger in the radio.
Blundell, Katherine +11 more
core +3 more sources
Spectral Variability in Radio-Loud Quasars [PDF]
Journal of Astrophysics and Astronomy, 2014 The spectral variability of a sample of 44 Flat-Spectrum Radio Quasars (FSRQs) and 18 Steep-Spectrum Radio Quasars (SSRQs) in SDSS stripe 82 region is investigated. Twenty-five of 44 FSRQs show a bluer-when-brighter trend (BWB), while only one FSRQ shows
Gu, Minfeng
core +3 more sources
Constraining the radio-loud fraction of quasars at z > 5.5 [PDF]
The Astrophysical Journal, 2015 Radio-loud active galactic nuclei at z∼ 2-4 are typically located in dense environments and their host galaxies are among the most massive systems at those redshifts, providing key insights for galaxy evolution.
Rix, H. +30 more
core +7 more sources
On the masses of black holes in radio-loud quasars [PDF]
Monthly Notices of the Royal Astronomical Society, 2001 The central black hole masses of a sample of radio-loud quasars are estimated by using the data of H beta linewidth and the optical continuum luminosity.
Gu, MF, Jiang, DR, Cao, XW
core +3 more sources
Properties of Very Broad Line MgII Radio-Loud and Radio-Quiet Quasars
Galaxies, 2021 We perform an analysis of the properties of radio-loud (RL) and radio-quiet (RQ) quasars with MgII broad emission line (i-band magnitude ≤19.1 and z ≤1.9), selected from the parent sample of SDSS DR7 catalogue.
Avinanda Chakraborty +1 more
exaly +3 more sources
Radio-loud flares from microquasars and radio-loudness of quasars [PDF]
Monthly Notices of the Royal Astronomical Society, 2005 The low-frequency power spectra of the X-ray and radio emission from four microquasars suggest that two distinct modes of energy output are at work: (i) the `coupled' mode in which the X-ray and radio luminosities are closely coupled and vary only weakly,
Binney J., NIPOTI, CARLO, Blundell K. M.
core +5 more sources
A comparison of the optical properties of radio-loud and radio-quiet quasars [PDF]
The Astrophysical Journal, 1998 We have made radio observations of 87 optically selected quasars at 5 GHz with the VLA in order to measure the radio power for these objects and hence determine how the fraction of radio-loud quasars varies with redshift and optical luminosity.
Kukula, MJ +4 more
core +3 more sources
Spectroscopic Properties Of Radio Loud And Radio Quiet Quasars [PDF]
Proceedings of the International Astronomical Union, 2019 Surveys have shown radio-loud (RL) quasars constitute $10 \%$-$15 \%$ of the total quasar population and rest are radio-quiet (RQ). However, it is unknown if this radio-loud fraction (RLF) (RL quasars/Total quasars) remains consistent among different ...
Chakraborty,Avinanda +1 more
core +6 more sources
The ultraviolet spectra of radio-loud and radio-quiet quasars [PDF]
The Astronomical Journal, 1993 The rest-frame ultraviolet spectral properties of matched samples of radio-loud, radio-moderate, and radio-quiet quasars are investigated, using quasars drawn from the Large Bright QSO Survey.
Francis, Paul +2 more
core +4 more sources