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Related papers: Hard - X-rays selected Active Galactic Nuclei. I. …

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A wide-frequency radio study of Active Galactic Nuclei (AGN) is crucial to evaluate the intervening radiative mechanisms responsible for the observed emission and relate them with the underlying accretion physics. We present wide frequency…

The physical origin of radio emission in Radio Quiet Active Galactic Nuclei (RQ AGN) remains unclear, whether it is a downscaled version of the relativistic jets typical of Radio Loud (RL) AGN, or whether it originates from the accretion…

Astrophysics of Galaxies · Physics 2015-08-06 Ehud Behar , Ranieri D. Baldi , Ari Laor , Assaf Horesh , Jamie Stevens , Tasso Tzioumis

We present the first broad-band X-ray study of the nuclei of 14 hard X-ray selected giant radio galaxies, based both on the literature and on the analysis of archival X-ray data from NuSTAR, XMM-Newton, Swift and INTEGRAL. The X-ray…

High Energy Astrophysical Phenomena · Physics 2018-09-26 F. Ursini , L. Bassani , F. Panessa , A. J. Bird , G. Bruni , M. Fiocchi , A. Malizia , L. Saripalli , P. Ubertini

We have used the VLBA at 5 GHz to observe all galaxies with nuclear radio flux densities above 3.5 mJy found in a VLA survey at 15 GHz of a sample of nearby LINER galaxies. All galaxies were detected revealing high brightness temperature…

Astrophysics · Physics 2009-10-31 Heino Falcke , Neil M. Nagar , Andrew S. Wilson , James S. Ulvestad

We have conducted 22 GHz radio imaging at 1" resolution of 100 low-redshift AGN selected at 14-195 keV by the Swift-BAT. We find a radio core detection fraction of 96%, much higher than lower-frequency radio surveys. Of the 96…

The origin of core radio emission in radio-quiet active galactic nuclei (AGNs) is still actively debated. General relativistic magnetohydrodynamics simulations often predict the launching of moderately large-scale jets from super-Eddington…

High Energy Astrophysical Phenomena · Physics 2026-01-13 Jeremiah D. Paul , Richard M. Plotkin

(Abridged) We present the results from new 15 ks Chandra-ACIS and 4.9 GHz Very Large Array observations of 13 galaxies hosting low luminosity AGN. This completes the multiwavelength study of a sample of 51 nearby early-type galaxies…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-03 Preeti Kharb , A. Capetti , D. J. Axon , M. Chiaberge , P. Grandi , A. Robinson , G. Giovannini , B. Balmaverde , D. Macchetto , R. Montez

For nearly seven decades astronomers have been studying active galaxies, that is to say galaxies with actively accreting central supermassive black holes, AGN. A small fraction of these are characterized by luminous, powerful radio…

Astrophysics of Galaxies · Physics 2021-05-12 J. F. Radcliffe , P. D. Barthel , M. A. Garrett , R. J. Beswick , A. P. Thomson , T. W. B. Muxlow

The X-ray emission from bright active galactic nuclei (AGNs) is believed to originate in a hot corona lying above a cold, geometrically thin accretion disk. A highly concentrated corona located within $\sim10$ gravitational radii above the…

High Energy Astrophysical Phenomena · Physics 2017-10-04 B. F. Liu , Ronald E. Taam , Erlin Qiao , Weimin Yuan

Compact radio active galactic nuclei (compact radio AGN) are compact ($\leq$ 20 kpc), powerful radio sources. Currently, the preferred scenario is that they are at the early stage of AGN evolution. At present, the research of compact radio…

Astrophysics of Galaxies · Physics 2022-01-05 Mai Liao , Minfeng Gu

We present a study of the extended radio emission in a sample of 8434 low redshift (z < 0.35) broad line active galactic nuclei (AGN) from the Sloan Digital Sky Survey (SDSS). To calculate the jet and lobe contributions to the total radio…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 Stephen E. Rafter , D. Michael Crenshaw , Paul J. Wiita

We investigate the 1.4 GHz radio properties of 92 nearby (z<0.05) ultra hard X-ray selected Active Galactic Nuclei (AGN) from the Swift Burst Alert Telescope (BAT) sample. Through the ultra hard X-ray selection we minimise the biases…

Astrophysics of Galaxies · Physics 2016-05-04 O. Ivy Wong , M. J. Koss , K. Schawinski , A. D. Kapińska , I. Lamperti , K. Oh , C. Ricci , S. Berney

[ABRIDGED] This is the third in a series of three papers exploring the connection between the multiwavelength properties of AGN in nearby early-type galaxies and the characteristics of their hosts. We selected 116 AGN candidates requiring a…

Astrophysics · Physics 2009-11-11 Alessandro Capetti , Barbara Balmaverde

We present new XMM-Newton observations of two luminous and high accretion-rate radio-quiet active galactic nuclei (AGNs) at z~2. Together with archival X-ray and rest-frame optical spectra of three sources with similar properties as well as…

Astrophysics · Physics 2009-11-11 Ohad Shemmer , W. N. Brandt , Hagai Netzer , Roberto Maiolino , Shai Kaspi

mm-wave emission from Active Galactic Nuclei (AGN) may hold the key to understanding the physical origin of their radio cores. The correlation between radio/mm and X-ray luminosity may suggest a similar physical origin of the two sources.…

Astrophysics of Galaxies · Physics 2018-05-23 Ehud Behar , Stuart Vogel , Ranieri D. Baldi , Krista L. Smith , Richard F. Mushotzky

We present X-ray observations of the nuclear region of 25 Fanaroff-Riley I radio galaxies from the 3CRR and B2 catalogs, using data from the Chandra and XMM archives. We find the presence of a X-ray Central Compact Core (CCCX) in 13/25…

Astrophysics · Physics 2009-11-10 D. Donato , R. M. Sambruna , M. Gliozzi

This is the second of a series of three papers exploring the connection between the multiwavelength properties of AGN in nearby early-type galaxies and the characteristics of their hosts. In Capetti et al. (2005) we presented a study of the…

Astrophysics · Physics 2009-11-11 B. Balmaverde , A. Capetti

We have analyzed new, archival and published high resolution radio and X-ray observations of a sample of composite LINER/HII galaxies known to exhibit AGN-like properties. Five of the 16 AGN candidates have milliarcsecond-scale detections…

Astrophysics · Physics 2009-11-10 M. E. Filho , F. Fraternali , S. Markoff , N. M. Nagar , P. D. Barthel , L. C. Ho , F. Yuan

(abbreviated): This paper presents the results of a high resolution radio imaging survey of all known (96) low-luminosity active galactic nuclei (LLAGNs) at D<19Mpc. We find that almost half of all LINERs and low-luminosity Seyferts have…

Astrophysics · Physics 2009-11-07 N. M. Nagar , H. Falcke , A. S. Wilson , J. S. Ulvestad

Active galactic nuclei (AGN) are powerful sources of panchromatic radiation. All AGN emit in X-rays, contributing around $\sim 5-10\%$ of the AGN bolometric luminosity. The X-ray emitting region, popularly known as the corona, is…

High Energy Astrophysical Phenomena · Physics 2024-12-24 Sibasish Laha , Claudio Ricci , John C. Mather , Ehud Behar , Luigi C. Gallo , Frederic Marin , Rostom Mbarek , Amelia Hankla
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