Results 1 to 10 of about 10,384 (186)

Correlation between radio and broad-line emissions in radio-loud quasars [PDF]

Monthly Notices of the Royal Astronomical Society, 1999
Radio emission is a good indicator of the jet power of radio-loud quasars, while the emission in broad-line can well represent the accretion disc radiation in quasars. We compile a sample of all sources of which the broad-line fluxes are available from 1
Baker, Baldwin, Baldwin, Bergeron, Blandford, Blandford, Capetti, Celotti, Celotti, Corbin, Corbin, D. R. Jiang, di Serego Alighieri, Ellingson, Espey, Falcke, Falcke, Falcke, Francis, Fricke, Gelderman, Ghisellini, Hunstead, Jackson, Kinney, Kühr, Kühr, Lacy, Lawrence, Marziani, Neugebauer, Oke, Osmer, Pauliny Toth, Perez, Rawlings, Richstone, Rudy, Serjeant, Smith, Steiner, Stickel, Stickel, Stickel, Stickel, Stickel, Stickel, Stickel, Stickel, Stickel, Stiko, Stockton, Tadhunter, Vermeulen, Wampler, Wang, Warren, Wills, Wills, Xinwu Cao   +59 more
core   +5 more sources

Properties of Very Broad Line MgII Radio-Loud and Radio-Quiet Quasars

Galaxies, 2021
We perform an analysis of the properties of radio-loud (RL) and radio-quiet (RQ) quasars with MgII broad emission line (i-band magnitude ≤19.1 and z ≤1.9), selected from the parent sample of SDSS DR7 catalogue.
Avinanda Chakraborty, Anirban Bhattacharjee, Suchetana Chatterjee   +2 more
doaj   +1 more source

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

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, Macon Magno, Ashutosh Tripathi   +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, Swayamtrupta Panda, Alice Deconto Machado, Ascension Del Olmo   +3 more
doaj   +1 more source

Radio Properties of z>4 Optically-Selected Quasars [PDF]

, 2000
We report on two programs to address differential evolution between the radio-loud and radio-quiet quasar populations at high (z>4) redshift. Both programs entail studying the radio properties of optically-selected quasars.
Daniel Stern, Goldschmidt P., Hook I. M., J. V. Wall, McMahon R. G., Miller L., Miller P., Peacock J. A., R. A. Perley, Reinaldo R. de Carvalho, S. G. Djorgovski, Shaver P. A., Zickgraf F.-J.   +12 more
core   +2 more sources

The Pan-STARRS1 z > 5.6 Quasar Survey. II. Discovery of 55 Quasars at 5.6 < z < 6.5

The Astrophysical Journal Supplement Series, 2023
The identification of bright quasars at z ≳ 6 enables detailed studies of supermassive black holes, massive galaxies, structure formation, and the state of the intergalactic medium within the first billion years after the Big Bang.
Eduardo Bañados, Jan-Torge Schindler, Bram P. Venemans, Thomas Connor, Roberto Decarli, Emanuele Paolo Farina, Chiara Mazzucchelli, Romain A. Meyer, Daniel Stern, Fabian Walter, Xiaohui Fan, Joseph F. Hennawi, Yana Khusanova, Nidia Morrell, Riccardo Nanni, Gaël Noirot, Antonio Pensabene, Hans-Walter Rix, Joseph Simon, Gijs A. Verdoes Kleijn, Zhang-Liang Xie, Da-Ming Yang, Andrew Connor   +22 more
doaj   +1 more source

The radio luminosity, black hole mass and Eddington ratio for quasars from the Sloan Digital Sky Survey [PDF]

, 2008
We investigate the $\mbh- \sigma_*$ relation for radio-loud quasars with redshift ...
Abazajian K, Akritas M G, Bonning E W, Boroson T A, Chen Hu, Dasyra K M, Drory N, Ferrarese L, Gebhardt K, Greene J E, Greene J E, Greene J E, Greene J E, Grupe D, Heckman T M, Ho L C, Ho L C, Kai Huang, Kaspi S, Kaspi S, Komossa S, Komossa S, Lacy M, Laor A, Laor A, Lauer T R, LaValley M P, Liu Y, Nelson C H, Netzer H, Onken C A, Peterson B M, Richards G T, Salviander S, Schneider D P, Shen J-J, Shields J C, Sikora M, Storey P J, Strittmatter P A, Terashima Y, Tremaine S, Treu T, Vanden B, Wang J M, Wang R, Wei-Hao Bian, Whalen D J, Woo J H, Woo J H, Xu C, Yan Xu, Yan-Mei Chen, Yuan F, Zhou H, Zhou H Y   +55 more
core   +1 more source

The jet-disc connection: evidence for a reinterpretation in radio loud and radio quiet active galactic nuclei [PDF]

, 2013
To constrain models of the jet-disc connection, we explore Eddington ratios reported in Foschini (2011) and interpret them in relation to the values in Sikora et al.
Garofalo, David
core   +3 more sources

Blazars in the early Universe [PDF]

, 2011
We investigate the relative occurrence of radio--loud and radio-quiet quasars in the first billion years of the Universe, powered by black holes heavier than one billion solar masses. We consider the sample of high-redshfit blazars detected in the hard X-
Abdo, Ajello, Baes, Becker, Bernardi, Bryan, Croton, F. Haardt, Ferrarese, G. Ghisellini, Ghisellini, Ghisellini, Ghisellini, Gültekin, Haiman, Hook, Hopkins, Häring, Jiang, Kormendy, Kormendy, Kurk, Lauer, Lauer, M. Volonteri, Marconi, Marconi, McGreer, Merloni, Pizzella, R. Della Ceca, Rhook, Richards, Richards, Romani, Schneider, Shakura, Shen, Sheth, Treister, Tremaine, Tundo, Volonteri, Volonteri, Willott, Worsley, Worsley, Wyithe, Yuan   +48 more
core   +1 more source