Results 51 to 60 of about 10,384 (186)

X-rays from a radio-loud compact BAL Quasar 1045+352 and the nature of outflows in radio-loud BAL Quasars

, 2009
We present new results on X-ray properties of radio loud broad absorption line (BAL) quasars and focus on broad-band spectral properties of a high ionization BAL (HiBAL) compact steep spectrum (CSS) radio-loud quasar 1045+352.
Agnieszka Janiuk, Aneta Siemiginowska, Bechtold, Becker, Brotherton, Brotherton, Crusius, Czerny, Elvis, Gallagher, Gallagher, Ganguly, Ghisellini, Ghosh, Ghosh, Green, Gregg, Gregg, Hatziminaoglou, Hewett, Hirose, Janiuk, Janiuk, Kardashev, Krzysztof Katarzyński, Kunert-Bajraszewska, Magdalena Kunert-Bajraszewska, Miller, Miller, Proga, Reynolds, Schaefer, Shen, Siemiginowska, Sobolewska, Sobolewska, Stawarz, Turner, Wang, White, Wills, Wills, Witt, Young, Zhou   +44 more
core   +1 more source

Double Lobed Radio Quasars from the Sloan Digital Sky Survey [PDF]

, 2005
We have combined a sample of 44984 quasars, selected from the Sloan Digital Sky Survey (SDSS) Data Release 3, with the FIRST radio survey. Using a novel technique where the optical quasar position is matched to the complete radio environment within 450",
Antonucci R., Best P. N., Fanaroff B. L., Fanti C., Francis P. J., Hoekstra H., Mackay C. D., Mantovani F., Nilsson K., R. H. Becker, R. L. White, Rees M. J., W. H. de Vries   +12 more
core   +3 more sources

Disentangling the AGN and Star formation Contributions to the Radio–X-Ray Emission of Radio-loud Quasars at 1 < Z < 2

The Astrophysical Journal, 2023
We constrain the emission mechanisms responsible for the prodigious electromagnetic output generated by active galactic nuclei (AGNs) and their host galaxies with a novel state-of-the-art AGN radio-to-X-ray spectral energy distribution model fitting code
Mojegan Azadi, Belinda Wilkes, Joanna Kuraszkiewicz, Jonathan McDowell, Ralf Siebenmorgen, Matthew Ashby, Mark Birkinshaw, Diana Worrall, Natasha Abrams, Peter Barthel, Giovanni G. Fazio, Martin Haas, Sóley Hyman, Rafael Martínez-Galarza, Eileen T. Meyer   +14 more
doaj   +1 more source

Mean and Extreme Radio Properties of Quasars and the Origin of Radio Emission [PDF]

, 2015
We investigate the evolution of both the radio-loud fraction (RLF) and (using stacking analysis) the mean radio-loudness of quasars. We consider how these values evolve as a function of redshift and luminosity, black hole (BH) mass and accretion rate ...
Kratzer, Rachael M., Richards, Gordon T.
core   +1 more source

Clustering of Radio Galaxies and Quasars [PDF]

, 2009
We compute the cross-correlation between a sample of 14,000 radio-loud AGN (RLAGN) with redshifts between 0.4 and 0.8 selected from the Sloan Digital Sky Survey and a reference sample of 1.2 million luminous red galaxies in the same redshift range.
Antonucci, Barr, Barthel, Barthel, Becker, Best, Best, Best, Blanton, Boroson, Bower, Bruzual, Böhringer, Cannon, Cheng Li, Coil, Collister, Collister, Condon, Croom, Croton, Davis, DaÂngela, Donoso, Dunlop, E. Donoso, Fabian, Fanaroff, Franceschini, G. Kauffmann, Hamilton, Hardcastle, Hardcastle, Hardcastle, Heckman, Hickox, Hill, Hine, Ho, Häring, Jackson, Kauffmann, Kauffmann, Kellermann, Lacy, Laing, Lawrence, Ledlow, Li, Li, Li, Mandelbaum, McNamara, Merloni, Metacalf, Miley, P. N. Best, Padmanabhan, Peebles, Pentericci, Porciani, Prestage, Richards, Schneider, Shen, Shen, Sheth, Simpson, Smith, Snellen, Somerville, Stocke, Stoughton, T. M. Heckman, Urry, Wake, Wold, Yates, York   +78 more
core   +1 more source

Prospects for Observing High-redshift Radio-loud Quasars in the SKA Era: Paving the Way for 21 cm Forest Observations

The Astrophysical Journal
The 21 cm forest is a sensitive probe for the early heating process and small-scale structures during the epoch of reionization (EOR), to be realized with the upcoming Square Kilometre Array (SKA). Its detection relies on the availability of radio-bright
Qi Niu, Yichao Li, Yidong Xu, Hong Guo, Xin Zhang   +4 more
doaj   +1 more source

PG 1004+130: Hybrid Morphology Source or a Restarted FRII? A uGMRT Polarimetric Investigation

The Astrophysical Journal, 2023
We present the polarization image of the hybrid morphology and broad absorption line quasar PG 1004+130 at 694 MHz obtained with the upgraded Giant Metrewave Radio Telescope. We detect linear polarization in this source’s core, jets, and lobes.
Salmoli Ghosh, P. Kharb, J. Baghel, S. Silpa   +3 more
doaj   +1 more source

QSO environments at intermediate redshifts [PDF]

, 2001
We have made a survey of quasar environments at 0.5 < z < 0.8, using a sample of both radio-loud and radio-quiet quasars matched in B-band luminosity.
Lacy, M., Lilje, P. B., Serjeant, S., Wold, M.   +3 more
core   +2 more sources

Cross‐Polarization Gain Calibration of Linearly Polarized VLBI Antennas by Observations of 4C 39.25

Radio Science, Volume 59, Issue 4, April 2024.
Abstract Radio telescopes with dual linearly polarized feeds regularly participate in Very Long Baseline Interferometry. One example is the VLBI Global Observing System (VGOS), which is employed for high‐precision geodesy and astrometry. In order to achieve the maximum signal‐to‐noise ratio, the visibilities of all four polarization products are ...
F. Jaron, I. Martí‐Vidal, M. Schartner, J. González‐García, E. Albentosa‐Ruiz, S. Bernhart, J. Böhm, J. Gruber, S. Modiri, A. Nothnagel, V. Pérez‐Díez, T. Savolainen, B. Soja, E. Varenius, M. H. Xu   +14 more
wiley   +1 more source

The Radio‐Loud Narrow‐Line Quasar SDSS J172206.03+565451.6

The Astrophysical Journal, 2006
We report identification of the radio loud narrow-line quasar SDSS J172206.03+565451.6 which we found in the course of a search for radio loud narrow-line Active Galactic Nuclei (AGN). SDSSJ172206.03+565451.6 is only the ~4th securely identified radio loud narrow-line quasar and the second-most radio loudest with a radio index R_1.4 ~ 100-700.
Komossa, S., Voges, W., Adorf, H., Xu, D., Mathur, S., Anderson, S.   +5 more
openaire   +3 more sources