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Keywords = interstellar medium (ISM): nebulae

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19 pages, 6571 KiB  
Review
Ionizing Spotlight of Active Galactic Nucleus
by Alexei V. Moiseev and Aleksandrina A. Smirnova
Galaxies 2023, 11(6), 118; https://doi.org/10.3390/galaxies11060118 - 7 Dec 2023
Cited by 5 | Viewed by 3693
Abstract
Ionization cones and relativistic jets give us one of the most large-scale example of active galactic nuclei (AGN) influence on the surrounding gas environment in galaxies and beyond. The study of ionization cones makes it possible not only to test the predictions of [...] Read more.
Ionization cones and relativistic jets give us one of the most large-scale example of active galactic nuclei (AGN) influence on the surrounding gas environment in galaxies and beyond. The study of ionization cones makes it possible not only to test the predictions of the unified model of galactic activity, but also to probe galaxy gas environment and trace how the luminosity of the nucleus changes over time (a light echo). In the external galactic or even extragalactic gas ionization cones create Extended Emission-Line Regions (EELRs) which can span distances from several to hundreds kpc away a host galaxy. We review the recent results of studying the gas kinematics and its ionization properties in EELRs with a special attention to search of fading AGN radiation on the time scale few×(104−105) years.The role of modern narrow-band and integral-field surveys in these researches is also considered. Full article
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14 pages, 2137 KiB  
Article
Enigmatic Emission Structure around Mrk 783: Cross-Ionization of a Companion 100 kpc Away
by Alexei V. Moiseev, Aleksandrina A. Smirnova and Tigran A. Movsessian
Universe 2023, 9(12), 493; https://doi.org/10.3390/universe9120493 - 26 Nov 2023
Cited by 2 | Viewed by 1762
Abstract
Mrk 783 is a narrow-line Seyfert 1 galaxy that possesses a relatively large two-sided radio emission extending up to 14 kpc from the active nucleus possibly connected with a large-scale ionized gas emission. We obtained a deep [O iii] image that revealed [...] Read more.
Mrk 783 is a narrow-line Seyfert 1 galaxy that possesses a relatively large two-sided radio emission extending up to 14 kpc from the active nucleus possibly connected with a large-scale ionized gas emission. We obtained a deep [O iii] image that revealed an extended system of emission knots and diffuse ionized gas surrounding the main galaxy. The highly-excited gas is related not only to the radio structure, but also to tidal features illuminated by the active nucleus radiation up to the projected distance of 41 kpc as it follows from the emission lines’ intensities and kinematics derived from the long-slit spectroscopic data. Moreover, the part of the disk of the companion galaxy SDSS J130257.20+162537.1, located at ∼99 kpc projected distances to the north of Mrk 783, also falls in the AGN ionizing cone. It is possiblethat Mrk 783 can be considered as ‘Hanny’s Voorwerp precursor’, i.e., a galaxy that demonstrates signs of sequential switching from radio-loud to radio-quiet nuclear activity, in the moment before its ionization luminosity falls. Full article
(This article belongs to the Section Galaxies and Clusters)
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11 pages, 533 KiB  
Article
Gas and Stars in the Teacup Quasar Looking with the 6-m Telescope
by Alexei V. Moiseev and Alina I. Ikhsanova
Universe 2023, 9(2), 66; https://doi.org/10.3390/universe9020066 - 27 Jan 2023
Cited by 4 | Viewed by 1564
Abstract
New results on the radio-quiet type 2 quasar, known as the Teacup galaxy (SDSSJ1430+1339), based on the long-slit and 3D spectroscopic data obtained at the Russian 6-m telescope, are presented. The ionized gas giant nebula, which extends up to r=56 kpc [...] Read more.
New results on the radio-quiet type 2 quasar, known as the Teacup galaxy (SDSSJ1430+1339), based on the long-slit and 3D spectroscopic data obtained at the Russian 6-m telescope, are presented. The ionized gas giant nebula, which extends up to r=56 kpc in the [O iii] emission line, was mapped with the scanning Fabry–Perot interferometer. The direct estimation of the emission line ratios confirmed that the giant nebula is ionized by the AGN. Stars in the inner r<5 kpc are significantly younger than the outer host galaxy and have a solar metallicity. The central starburst age (∼1 Gyr) agrees with possible ages for the galactic merger events and the previous episode of the quasar outflow produced two symmetric arcs visible in the [O iii] emission at the distances r= 50–55 kpc. The ionized gas velocity field can be fitted by the model of a circular rotating disk significantly inclined or even polar to the stellar host galaxy. Full article
(This article belongs to the Special Issue A Multimessenger View of Supermassive Black Holes and the Quasar Main Sequence)
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