Results 21 to 30 of about 78,490 (277)
Environmental Effects on Local Active Galactic Nuclei [PDF]
, 1994 Using an extensive sample of nearby galaxies (the Nearby Galaxies Catalog, by Tully), we investigate the environment of the galaxies hosting low-luminosity AGNs (Seyferts and LINERs).
Giuricin, Giuliano +3 more
core +2 more sources
The Astrophysical Journal, 2023 To understand the formation and growth of supermassive black holes (SMBHs) and their coevolution with host galaxies, it is essential to know the impact of environment on the activity of active galactic nuclei (AGNs).
Zhensong Hu +16 more
doaj +1 more source
JETTED ACTIVE GALACTIC NUCLEI [PDF]
International Journal of Modern Physics: Conference Series, 2012 Most of the electromagnetic output of blazars (BL Lac objects and Flat Spectrum Radio Quasars) comes out in the γ–ray band, making the Large Area Telescope [0.1–100 GeV] onboard the Fermi satellite and the Cherenkov telescopes crucial for gather crucial data and thus to understand their physics.
openaire +3 more sources
, 2013 Apresentação realizada como parte da avaliação da disciplina "Introdução a Astrofísica Extragaláctica" (2013)
+6 more sources
The Astrophysical Journal, 2023 1ES1927+654 is a nearby active galactic nucleus (AGN) that has shown an enigmatic outburst in optical/UV followed by X-rays, exhibiting strange variability patterns at timescales of months to years.
Ritesh Ghosh +26 more
doaj +1 more source
Two-temperature coronae in active galactic nuclei [PDF]
, 1997 We show that coronal magnetic dissipation in thin active sheets that sandwich standard thin accretion disks in active galactic nuclei may account for canonical electron temperatures of a few $\times 10^9$K if protons acquire most of the dissipated energy.
Blackman, E. G. +2 more
core +3 more sources
Reionization with galaxies and active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT In this work we investigate the properties of the sources that reionized the intergalactic medium (IGM) in the high-redshift Universe. Using a semi-analytical model aimed at reproducing galaxies and black holes in the first ∼1.5 Gyr of the Universe, we revisit the relative role of star formation and black hole accretion in ...
Tirthankar Roy Choudhury +12 more
openaire +4 more sources
Obscured Active Galactic Nuclei [PDF]
Annual Review of Astronomy and Astrophysics, 2018 Active galactic nuclei (AGN) are powered by the accretion of material onto a supermassive black hole (SMBH) and are among the most luminous objects in the Universe. However, the huge radiative power of most AGN cannot be seen directly, as the accretion is hidden behind gas and dust that absorb many of the characteristic observational signatures.
Hickox, R.C, Alexander, D.M.
openaire +4 more sources
Active Galactic Nuclei as High Energy Engines [PDF]
, 1999 Active Galactic Nuclei are considered as possible sites of cosmic ray acceleration and some of them have been observed as high energy gamma ray emitters (Blazars). There naturally comes an appealing idea that the acceleration of the highest energy cosmic
Aharonian +31 more
core +3 more sources
VARIABILITY OF ACTIVE GALACTIC NUCLEI [PDF]
, 2001 Continuum and emission-line variability of active galactic nuclei provides a powerful probe of microarcsecond scale structures in the central regions of these sources. In this contribution, we review basic concepts and methodologies used in analyzing AGN variability.
openaire +4 more sources