Results 1 to 10 of about 10,349 (118)

The jet emitting disk‐standard accretion disk model applied to the active galactic nuclei ultra violet–X‐ray correlation

Astronomische Nachrichten, Volume 344, Issue 4, May 2023., 2023
Abstract The non‐linear correlation between the UV and X‐ray emission observed in active galactic nuclei remains a puzzling question that challenges accretion models. While the UV emission originates from the cold disk, the X‐ray emission is emitted by a hot corona whose physical characteristics and geometry are still highly debated.
S. Barnier, P.‐O. Petrucci, J. Ferreira, G. Marcel   +3 more
wiley   +1 more source

Optical and UV properties of a radio‐loud and a radio‐quiet Population A quasar at high redshift

Astronomische Nachrichten, Volume 343, Issue 1-2, January-February 2022., 2022
Abstract Different properties of quasars may be observed and analyzed through the many ranges of the electromagnetic spectrum. Pioneering studies showed that an “H‐R diagram” for quasars was needed to organize these data, and that more than two dimensions were necessary: a four‐dimensional Eigenvector (4DE1) parameter space was proposed. The 4DE1 makes
Alice Deconto‐Machado, Ascensión del Olmo, Paola Marziani, Jaime Perea, Giovanna Stirpe   +4 more
wiley   +1 more source

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

Peaked sources and narrow‐line Seyfert 1s: A love story

Astronomische Nachrichten, Volume 342, Issue 9-10, Page 1066-1070, November-December 2021., 2021
Abstract The first similarities between peaked sources (PS) and narrow‐line Seyfert 1 (NLS1) galaxies were noticed already 20 years ago. Nowadays, it is known that several sources can share both classifications, and that part of the parent population of γ‐ray emitting NLS1s could be hiding among PS.
Marco Berton, Emilia Järvelä
wiley   +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

A study of [O III]/[O II] lines ratio in type 1 active galactic nucleus: Influence of radio jets and Eddington ratio to narrow line region emission

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, Mochamad Ikbal Arifyanto, Wolfram Kollatschny   +2 more
wiley   +1 more source

The role of black hole mass in quasar radio activity [PDF]

, 2005
We use a homogeneous sample of about 300, 0.3
Bachev, Becker, Blandford, Blandford, Brotherton, Brotherton, Cavaliere, Cirasuolo, Cirasuolo, Cirasuolo, Corbett, Croom, Croom, Di Matteo, Dunlop, Franceschini, Granato, Hewett, Ho, Ivezic, Jarvis, Kellermann, Lacy, Lahav, Laor, M. Magliocchetti, Magliocchetti, Magliocchetti, Magliocchetti, Marchesini, Marziani, Marziani, McLure, McLure, McLure, McLure, McLure, McLure, McLure, Miller, Oshlack, Porciani, R. B. Metcalf, Richards, Schade, Schneider, Silk, Snellen, Sulentic, White, Wold, Woo, Woo   +52 more
core   +3 more sources

An X-ray selected sample of radio-loud quasars [PDF]

, 2001
We construct the first X-ray selected sample of broad line radio-loud AGN from the EMSS survey. In order to test unifying schemes for radio-loud objects, their spectral and statistical properties (both flat and steep spectrum objects) are examined and ...
A. Celotti, A. Wolter, Avni, Becker, Boyle, Brinkmann, Caccianiga, Cavaliere, Celotti, Chiaberge, Condon, Della Ceca, Della Ceca, Dunlop, Fossati, Ghisellini, Ghisellini, Gioia, Gregory, Laurent-Muehleisen, Maccacaro, Maccacaro, Maraschi, Morris, Padovani, Padovani, Padovani, Perlman, Schmidt, Stark, Stocke, Stocke, Wall, Wolter   +33 more
core   +2 more sources