Results 71 to 80 of about 796,792 (175)
IRAS observations of radio-quiet and radio-loud quasars
The Astrophysical Journal, 1984 Observations from 12 to 100 microns are presented of two radio-quiet and three radio-loud quasars. Over this wavelength range, all five have grossly similar continuum energy distributions. The continua of the radio-loud quasars are consistent with synchrotron radiation.
Neugebauer, G. +9 more
openaire +3 more sources
Cosmological constraints from Type I radio-loud quasars [PDF]
, 2023 We obtain a new sample of 1192 Type I quasars with the UV-optical, radio and X-ray wavebands coverage by combining \citet{Huang2022} and other matching data of SDSS-DR16 with FIRST, XMM-Newton, and Chandra Source Catalog, and a sample of 407 flat ...
Fu, X. Y. +5 more
core +1 more source
The relative growth of optical and radio quasars in SDSS [PDF]
, 2010 We cross-correlate the Sloan Digital Sky Survey Data Release 3 quasar sample with Faint Images of the Radio Sky at Twenty centimetres (FIRST) and the Vestergaard et al.
Shankar, Francesco +3 more
core +1 more source
Resolving the Powerful Radio-loud Quasar at z ∼ 6 [PDF]
The Astrophysical Journal, 2018 We present high angular resolution imaging ($23.9 \times 11.3$ mas, $138.6 \times 65.5$ pc) of the radio-loud quasar PSO~J352.4034$-$15.3373 at $z=5.84$ with the Very Long Baseline Array (VLBA) at 1.54 GHz. This quasar has the highest radio-to-optical flux density ratio at such a redshift, making it the radio-loudest source known to date at $z \sim 6$.
Emmanuel Momjian +4 more
openaire +3 more sources
The Astrophysical JournalOQ 208 is a nearby, partially obscured quasar ( z = 0.077) that is a young, bright, parsec-scale radio source. We assemble archival and new high-frequency Very Long Baseline Array (VLBA) and Very Large Array (VLA) observations and optical spectra to form
Brian Punsly +14 more
doaj +1 more source
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 cluster environments of radio loud quasars
, 2001 5 pages, 3 figures, contribution to "Tracing Cosmic Evolution with Galaxy Clusters" (Sesto 2001), ASP Conference ...
Barr, J. +3 more
openaire +3 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
The EMSS Radio Loud Quasar Sample
, 2000 We construct the first X-ray selected sample of radio-loud quasars from the EMSS survey. The X-ray selection allows us to explore the properties of radio-loud quasars 10-100 weaker than classical samples in the radio band. There are no radio-loud quasars whose synchrotron peak reaches the UV-soft X-ray band at these (radio) flux levels (as occurs for ...
Wolter, Anna, Celotti, Annalisa
openaire +2 more sources
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