High-redshift active galactic nuclei and the next decade of Chandra and XMM-Newton
Sign Up to like & getrecommendations! Published in 2017 at "Astronomische Nachrichten"
DOI: 10.1002/asna.201713337
Abstract: We briefly review how X-ray observations of high-redshift active galactic nuclei (AGNs) at z = 4–7 have played a critical role in understanding their basic demographics as well as their physical processes; for example, absorption… read more here.
Keywords: high redshift; galactic nuclei; active galactic; xmm newton ... See more keywords
Exploring accretion disk physics and black hole growth with regular monitoring of ultrafast active galactic nucleus winds
Sign Up to like & getrecommendations! Published in 2017 at "Astronomische Nachrichten"
DOI: 10.1002/asna.201713338
Abstract: Fifteen years of XMM-Newton observations have established that ultrafast highly ionized winds (UFOs) are common in radio-quiet active galactic nucleus (AGN). A simple theory of Eddington-limited accretion correctly predicts the typical velocity (∼0.1c) and high… read more here.
Keywords: active galactic; accretion; black hole; physics ... See more keywords
Polarization in broad emission lines of active galactic nuclei
Sign Up to like & getrecommendations! Published in 2021 at "Astronomische Nachrichten"
DOI: 10.1002/asna.20210089
Abstract: Funding Information Ministry of Education, Science and Technological Development of R. Serbia, 451-03-68/202014/200002. 451-039/2021-14/200104. Ministry of Science and Higher Education of the Russian Federation, We discuss the polarization of broad emission lines in the type… read more here.
Keywords: polarization broad; geometry; polarization; broad emission ... See more keywords
The mineralogy of newly formed dust in active galactic nuclei
Sign Up to like & getrecommendations! Published in 2017 at "Planetary and Space Science"
DOI: 10.1016/j.pss.2017.08.012
Abstract: Abstract The tori around active galactic nuclei (AGN) are potential formation sites for large amounts of dust, and they may help resolve the so-called dust budget crisis at high redshift. We investigate the dust composition… read more here.
Keywords: galactic nuclei; mineralogy; active galactic; mineralogy newly ... See more keywords
The origin of radio emission from radio-quiet active galactic nuclei
Sign Up to like & getrecommendations! Published in 2019 at "Nature Astronomy"
DOI: 10.1038/s41550-019-0765-4
Abstract: The central nuclei of galaxies, where supermassive black holes (SMBHs) are thought to reside, can experience phases of activity when they become active galactic nuclei (AGNs). An AGN can eject winds and jets and produce… read more here.
Keywords: emission; active galactic; radio; galactic nuclei ... See more keywords
Ionized outflows from active galactic nuclei as the essential elements of feedback
Sign Up to like & getrecommendations! Published in 2020 at "Nature Astronomy"
DOI: 10.1038/s41550-020-01255-2
Abstract: Outflows from active galactic nuclei (AGNs) are one of the fundamental mechanisms by which the central supermassive black hole interacts with its host galaxy. Detected in ≥50% of nearby AGNs, these outflows have been found… read more here.
Keywords: galactic nuclei; active galactic; nuclei essential; ionized outflows ... See more keywords
Active galactic nuclei as seen by the Spitzer Space Telescope
Sign Up to like & getrecommendations! Published in 2020 at "Nature Astronomy"
DOI: 10.1038/s41550-020-1071-x
Abstract: The Spitzer Space Telescope revolutionized studies of active galactic nuclei (AGNs). Its combined sensitivity and mapping speed at mid-infrared wavelengths revealed a substantial population of highly obscured AGNs. This population implies a higher radiative accretion… read more here.
Keywords: galactic nuclei; space telescope; active galactic;
Tracking the state transitions in changing-look active galactic nuclei through their polarized-light echoes
Sign Up to like & getrecommendations! Published in 2020 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/201936123
Abstract: Context: Variations in the mass accretion rate appear to be responsible for the rapid transitions in spectral type that are observed in increasingly more active galactic nuclei (AGNs). These objects are now labeled "changing-look" AGNs… read more here.
Keywords: galactic nuclei; look; active galactic; polarized light ... See more keywords
Automatized Photometric Monitoring of Active Galactic Nuclei with the 46 cm Telescope of the Wise Observatory
Sign Up to like & getrecommendations! Published in 2017 at "Publications of the Astronomical Society of the Pacific"
DOI: 10.1088/1538-3873/aa7a55
Abstract: We present the first results of an ongoing variability monitoring program of active galactic nuclei (AGNs) using the 46\,cm telescope of the Wise observatory in Israel. The telescope has a field of view of $1.25^{\circ}… read more here.
Keywords: galactic nuclei; telescope wise; active galactic; monitoring ... See more keywords
Hydrodynamical simulations of the triggering of nuclear activities by minor mergers of galaxies
Sign Up to like & getrecommendations! Published in 2019 at "Research in Astronomy and Astrophysics"
DOI: 10.1088/1674-4527/19/12/177
Abstract: Major mergers of galaxies are considered to be an efficient way to trigger Active Galactic Nuclei and are thought to be responsible for the phenomenon of quasars. This has however recently been challenged by observations… read more here.
Keywords: galactic nuclei; mergers galaxies; active galactic; minor mergers ... See more keywords
Accretion and Host-Galaxy Properties of 14 New “Changing-Look” Active Galactic Nuclei Identified from the SDSS-V Survey
Sign Up to like & getrecommendations! Published in 2022 at "Research in Astronomy and Astrophysics"
DOI: 10.1088/1674-4527/ac995c
Abstract: The widely accepted active galactic nucleus (AGN) paradigm has been recently challenged by the discovery of the so-called ``changing-look'' (CL) phenomenon characterized by spectral-type transitions. By comparing the SDSS-V and SDSS DR16 spectroscopic datasets, here… read more here.
Keywords: active galactic; galaxy; accretion host; changing look ... See more keywords