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
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
On the relative importance of hadronic emission processes along the jet axis of active galactic nuclei
Sign Up to like & getrecommendations! Published in 2020 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/staa1650
Abstract: With the coincident detection of a gamma-ray flare and a neutrino from the blazar TXS 0506+056, Active Galactic Nuclei (AGN) have been put into focus as possible sources of the diffuse neutrino flux. We present… read more here.
Keywords: relative importance; galactic nuclei; active galactic; jet ... See more keywords
Changing look active galactic nuclei in the MaNGA survey
Sign Up to like & getrecommendations! Published in 2020 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/staa1939
Abstract: Changing look active galactic nuclei (CLAGNs) are rare cases of AGNs, where the continuum flux increases/decreases and the broad emission lines appear/disappear within short time-scales. These extreme changes challenge our understanding of accretion disc dynamics.… read more here.
Keywords: look active; galactic nuclei; active galactic; changing look ... See more keywords
Formation of supermassive black holes in galactic nuclei – I. Delivering seed intermediate-mass black holes in massive stellar clusters
Sign Up to like & getrecommendations! Published in 2021 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stab113
Abstract: Supermassive black holes (SMBHs) are found in most galactic nuclei. A significant fraction of these nuclei also contains a nuclear stellar cluster (NSC) surrounding the SMBH. In this paper, we consider the idea that the… read more here.
Keywords: black holes; supermassive black; mass; galactic nuclei ... See more keywords