Results 61 to 70 of about 719 (181)
Radio-loud Narrow-Line Type 1 Quasars [PDF]
The Astronomical Journal, 2006 We present the first systematic study of (non-radio-selected) radio-loud narrow-line Seyfert 1 (NLS1) galaxies. Cross-correlation of the `Catalogue of Quasars and Active Nuclei' with several radio and optical catalogues led to the identification of 11 radio-loud NLS1 candidates including 4 previously known ones. Most of the radio-loud NLS1s are compact,
Komossa, S. +7 more
openaire +4 more sources
Impact of Radio-mode Feedback on the Covering Fraction of the Circumgalactic Medium of Quasars
The Astrophysical JournalUtilizing data from the Low-Frequency Array Two-meter Sky Survey and the Sloan Digital Sky Survey, we assemble a sample of 1469 projected quasar pairs with detected radio emissions from foreground quasars, as well as a control sample of 5846 pairs ...
Wen-Qiang Liang +4 more
doaj +1 more source
A Powerful Radio-loud Quasar at the End of Cosmic Reionization [PDF]
The Astrophysical Journal Letters, 2018 Abstract We present the discovery of the radio-loud quasar PSO J352.4034–15.3373 at z = 5.84 ± 0.02. This quasar is the radio brightest source known, by an order of magnitude, at z ∼ 6 with a flux density in the range of 8–100 mJy from 3 GHz to 230 MHz and a radio loudness parameter
Eduardo Bañados +7 more
openaire +4 more sources
The Detection Rate of Associated Mg ii Absorption Lines in Quasars Depends on Their Radio Emission
The Astrophysical JournalIn active galactic nuclei, jet-driven feedback plays a significant role in influencing the properties of gas within their host galaxy and the circumgalactic medium.
Zhi-Fu Chen, Luis C. Ho
doaj +1 more source
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
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
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
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
Correlation between radio and broad line emission in radio loud quasars [PDF]
Monthly Notices of the Royal Astronomical Society, 1999 9 pages, accepted for publication in ...
Cao, Xinwu, Jiang, D. R.
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