Results 131 to 140 of about 771 (176)

QSOFEED: Investigating warm molecular, low- and high-ionization atomic gas in six type-2 quasars with GTC/EMIR

Astronomy & Astrophysics
We present long-slit near-infrared spectroscopic observations of six nearby (z ∼ 0.1) radio-quiet type-2 quasars (QSO2s) from the Quasar Feedback (QSOFEED) sample.
Cezar P. H., Coloma Puga M., Ramos Almeida C., Acosta-Pulido J. A., Speranza G., Holden L. R., Tadhunter C. N., Zanchettin M. V., Audibert A.   +8 more
doaj   +1 more source

Radio Spectra of Radio Quiet Quasars

The Astronomical Journal, 1996
Richard Barvainis, Colin Lonsdale, Robert Antonucci   +2 more
openaire   +1 more source

X-ray spectral evolution of high redshift quasars

, 2017
At z approx. equals 3, the x-ray spectra of radio-loud and radio-quiet quasars are different. High-redshift radio-quiet quasars either have large absorbing columns, NH, and steeper power law spectral indices, alphaepsilon, than low redshift quasars, or ...
Siemiginowska, Aneta, Wilkes, Belinda, Rieke, Marcia, Bechtold, Jill, McDowell, Jonathan, Kuhn, Olga, Cutri, Roc M., Elvis, Martin, Fiore, Fabrizio   +8 more
core   +1 more source

Powerful extragalactic jets dissipate their kinetic energy far from the central black hole. [PDF]

Nat Commun, 2020
Harvey ALW, Georganopoulos M, Meyer ET.
europepmc   +1 more source

Radiation and Magnetic Pressure Support in Accretion Disks Around Supermassive Black Holes and the Physical Origin of the Extreme-ultraviolet to Soft X-Ray Spectrum

The Astrophysical Journal
We present the results of four 3D radiation magnetohydrodynamic simulations of accretion disks around a 10 ^8 solar mass black hole, which produce the far-ultraviolet spectrum peak and demonstrate a robust physical mechanism for producing the extreme ...
Yan-Fei Jiang, Omer Blaes, Ish Kaul, Lizhong Zhang   +3 more
doaj   +1 more source

Host galaxies of intermediate redshift radio-loud and radio-quiet quasars

, 1996
In a search for host galaxies associated with quasars, the authors present results from deep CCD imaging using the European Southern Observatory 3.5-m New Technology Telescope.
Van Groningen, E., Ronnback, J., Orndahl, E., Wanders, I.   +3 more
core  

An Outflow from the X-Ray Corona as the Origin of Millimeter Emission from Radio-quiet AGNs

The Astrophysical Journal
Recent observations of radio-quiet active galactic nuclei have shown the presence of millimeter emission, whose origin remains unknown, from within parsec scales of the central black hole.
Amelia M. Hankla, Alexander Philippov, Rostom Mbarek, Richard F. Mushotzky, G. Musoke, Daniel Grošelj, Matthew Liska   +6 more
doaj   +1 more source

Multiwavelength analysis of the variability of the blazar 3C 273. [PDF]

Mon Not R Astron Soc, 2020
Fernandes S, Patiño-Álvarez VM, Chavushyan V, Schlegel EM, Valdés JR.   +4 more
europepmc   +1 more source

The Far-Infrared emission of Radio Loud and Radio Quiet Quasars

, 2017
Continuum observations at radio, millimetre, infrared and soft X-ray energies are presented for a sample of 22 quasars, consisting of flat and steep spectrum radio loud, radio intermediate and radio quiet objects.
Wilkes, Belinda, Courvoisier, T.J.-L., Hooper, E.J., Polletta, M.   +3 more
core  

The distribution and lifetime of powerful radio galaxies as a function of environment and redshift. [PDF]

Sci Rep, 2018
Garofalo D, Singh CB, Zack A.
europepmc   +1 more source