Results 81 to 90 of about 10,384 (186)
SwiftObservations of High‐Redshift Radio‐loud Quasars [PDF]
The Astrophysical Journal, 2007 We report on Swift observations of four z>2 radio-loud quasars (0212+735, 0537-286, 0836+710, and 2149-307), classified as blazars. The sources, well-known emitters at soft-medium X-rays, were detected at >5sigma with the BAT experiment in 15-150 keV.
Sambruna, R. M. +7 more
openaire +2 more sources
Multiband Comparative Study of Optical Microvariability in RL vs. RQ Quasars [PDF]
, 2009 We present the results of an optical multi-band (BVR) photometric monitoring program of 22 core-dominated radio-loud quasars (CRLQs) and 22 radio-quiet quasars (RQQs). The aim was to compare the properties of microvariability in both types of quasars. We
A. Ramírez +35 more
core +2 more sources
Investigating Differences in the Palomar-Green Blazar Population Using Polarization
The Astrophysical JournalWe present polarization images with the Karl G. Jansky Very Large Array (VLA) in A- and B-array configurations at 6 GHz of seven radio-loud (RL) quasars and eight BL Lac objects belonging to the Palomar-Green (PG) “blazar” sample.
Janhavi Baghel +7 more
doaj +1 more source
The Relationship between Mg ii Broad Emission and Quasar Inclination Angle
Frontiers in Astronomy and Space Sciences, 2017 Several observed spectral properties of quasars are believed to be influenced by quasar orientation. In this investigation we examine the effect of orientation on the Mg ii line located at 2,798 Å in a sample of 36 radio-loud quasars, with orientation ...
Conor Wildy, Bozena Czerny
doaj +1 more source
Radio-loud and radio-quiet BAL quasars: a detailed ultraviolet comparison [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 9 pages, 6 figures, 2 tables.
Rochais, Thomas B. +5 more
openaire +2 more sources
Probing the Heart of Active Narrow-line Seyfert 1 Galaxies with VERA Wideband Polarimetry
The Astrophysical Journal, 2023 We explored the parsec-scale nuclear regions of a sample of radio-loud narrow-line Seyfert 1 galaxies (NLSy1s) using the VLBI Exploration of Radio Astrometry wideband (at a recording rate of 16 Gbps) polarimetry at 22 and 43 GHz.
Mieko Takamura +11 more
doaj +1 more source
High-Redshift, Radio-Loud Quasars
, 2000 I discuss two programs to study radio-loud quasars at high (z>4) redshift. Quasars are the most luminous, non-transient objects known and are observed to the earliest cosmic epochs. At lower redshifts, radio-loud quasars are associated with host galaxies having deVaucoleurs profiles. By association, identifying and studying a sample of high-redshift,
openaire +2 more sources
Cosmological constraints from type-I radio-loud quasars
Physical Review DarXiv admin note: text overlap with arXiv:2207 ...
L. Huang +5 more
openaire +2 more sources
Differential evolution of radio quiet and radio loud quasars
The Astronomical Journal, 1995 We have observed 40 optically selected high-redshift quasars with the Very Large Array (VLA) at 1515 MHz (20 cm). Three quasars are detected above our 3 sigma limit of 0.2 mJy. We review all available evidence on radio detections of optically selected quasars in terms of their ratio R of radio to optical luminosity.
Maarten Schmidt +3 more
openaire +1 more source
On the masses of black-holes in radio-loud quasars [PDF]
, 2001 The central black-hole masses of a sample of radio-loud quasars are estimated by using the data of $H_{\beta}$ line-width and the optical continuum luminosity. The vast majority of the quasars in this sample have black-hole masses larger than $10^{8} M_{\
Cao, Xinwu, Gu, Minfeng, Jiang, D. R.
core +3 more sources