Results 21 to 30 of about 796,792 (175)
The radio spectral turnover of radio-loud quasars at z > 5 [PDF]
Astronomy & Astrophysics, 2022 We present Karl G. Jansky Very Large Array S- (2–4 GHz), C- (4–8 GHz), and X-band (8–12 GHz) continuum observations toward seven radio-loud quasars at z > 5. This sample has previously been found to exhibit spectral peaks at observed-frame frequencies above ∼1 GHz.
Yali Shao +10 more
openaire +4 more sources
The Dynamics and Energetics of Remnant and Restarting RLAGN
Galaxies, 2023 In this article, I review past, current, and future advances on the study of radio-loud AGN (RLAGN; radio-loud quasars and radio galaxies) lifecycles exclusively in the remnant and restarting phases.
Vijay H. Mahatma
doaj +1 more source
GB:1508+5714: a radio-loud quasar with z = 4.30 and the space density of high-redshift radio-loud quasars [PDF]
Monthly Notices of the Royal Astronomical Society, 1995 We report the discovery of a radio loud quasar with a redshift of 4.30. This object, which is the first radio selected quasar with a redshift greater than four, was discovered during an observational investigation into the evolution of the luminosity function of radio loud quasars. Here we describe results based on a sample of ~300, flat spectrum radio
HOOK, IM +6 more
openaire +3 more sources
The Environments of Radio-Loud Quasars [PDF]
, 2001 6 pages, 4 figures, to appear in the proc.
Barr, J. M., Bremer, M. N., Baker, J. C.
openaire +2 more sources
Radio loudness along the quasar main sequence [PDF]
Astronomy & Astrophysics, 2019 Context.When can an active galactic nucleus (AGN) be considered radio loud (RL)? Following the established view of the AGNs inner workings, an AGN is RL if associated with relativistic ejections emitting a radio synchrotron spectrum (i.e., it is a “jetted” AGN). In this paper we exploit the AGN main sequence that offers a powerful tool to contextualize
Ganci V. +6 more
openaire +4 more sources
3C 57 as an atypical radio-loud quasar: implications for the radio-loud/radio-quiet dichotomy [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 Accepted for publication in MNRAS; 10 pages, 6 figures, 4 ...
Sulentic, J. W. +6 more
openaire +5 more sources
Astronomische Nachrichten, Volume 341, Issue 3, Page 300-313, March 2020., 2020 Abstract We analyze emission line properties and their correlations for 18,043 type 1 active galactic nucleus (AGN) in the range of 0.02 ≤ z ≤ 0.8, based on Sloan Digital Sky Survey Data Release 14 data. We complement the data with photometric measurements from ROSAT, GALEX, 2MASS, and FIRST.
Irham Taufik Andika +2 more
wiley +1 more source
A cosmological distance measure using radio-loud quasars [PDF]
, 2023 We use the X-ray luminosity relation of radio-loud quasars (RLQs) to measure these luminosity distances as well as estimate cosmological parameters. We adopt four parametric models of X-ray luminosity to test luminosity correlation for RLQs and radio ...
Huang, L., Chang, Z. X.
core +1 more source
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
Metal Content in Relativistically Jetted and Radio-Quiet Quasars in the Main Sequence Context
Galaxies, 2023 The optical and UV properties of radio-quiet (RQ) and radio-loud (RL, relativistically “jetted”) active galactic nuclei (AGN) are known to differ markedly; however, it is still unclear what is due to a sample selection and what is associated with ...
Paola Marziani +3 more
doaj +1 more source