Counter-rotating gas disk in the S0 galaxy IC 560

Proshina, I. S.; Kniazev, A. Y.; Сильченко, О. К.

doi:10.1134/s1063773716120057

Cited by 2 publications

(1 citation statement)

References 28 publications

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“…When emission lines are strong -EW ([O III]λ5007) > 2 Å, -the correction through [O III] works poorly. However, for a few galaxies with rather strong emission lines we have our own long-slit spectra covering the red spectral range -for NGC 3599 (Sil'chenko et al 2010), for NGC 7743 (Katkov et al 2011), and for IC 560 (Proshina et al 2016). It makes possible to identify gas excitation mechanism by using the BPTdiagrams (Baldwin et al 1981) and to determine the Hβ correction for the emission through the Hα emission-line equivalent width estimates by applying a model Balmer decrement suitable for the particular excitation mechanism.…”

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confidence: 99%

Stellar Nuclei and Inner Polar Disks in Lenticular Galaxies

Сильченко¹

2016

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I analyze statistics of the stellar population properties for stellar nuclei and bulges of nearby lenticular galaxies in different environments by using panoramic spectral data of the integralfield spectrograph SAURON retrieved from the open archive of Isaac Newton Group. I estimate also the fraction of nearby lenticular galaxies having inner polar gaseous disks by exploring the volume-limited sample of early-type galaxies of the ATLAS-3D survey. By inspecting the two-dimensional velocity fields of the stellar and gaseous components with running tilted-ring technique, I have found 7 new cases of the inner polar disks. Together with those, the frequency of inner polar disks in nearby S0 galaxies reaches 10% that is much higher than the frequency of large-scale polar rings. Interestingly, the properties of the nuclear stellar populations in the inner polar ring hosts are statistically the same as those in the whole S0 sample implying similar histories of multiple gas accretion events from various directions.

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Section: Analysis Of the Datamentioning

confidence: 99%

Stellar Nuclei and Inner Polar Disks in Lenticular Galaxies

Сильченко¹

2016

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Retrograde infall of the intergalactic gas onto S-galaxy and activity of galactic nuclei

Khrapov,

Khoperskov

2024

Open Astronomy

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We present the results of numerical simulations focused on the accretion of intergalactic gas onto a gas-rich S-type disc galaxy. Our investigation explores the conditions favouring the emergence of counterrotating stellar and gaseous components within the galaxy, leading to the inflow of gas towards the central kiloparsec of the galaxy. Notably, we find that the most substantial reservoir of gas, serving as fuel for galactic nucleus activity, resides within the central region during the retrograde infall of gas at an incident angle of approximately 2 0 ° 2{0}^{^\circ } relative to the galactic plane. Departures from this angle significantly diminish the gas flow rate towards the galactic centre. Conversely, the prograde infall of intergalactic gas makes a marginal contribution to the gas content in the central region and cannot supply fuel to the active galactic nucleus. An intriguing characteristic of the observed retrograde impact is the emergence of a rotating polar ring at the galaxy’s periphery, primarily originating from intergalactic gas.

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Counter-rotating gas disk in the S0 galaxy IC 560

Cited by 2 publications

References 28 publications

Stellar Nuclei and Inner Polar Disks in Lenticular Galaxies

Stellar Nuclei and Inner Polar Disks in Lenticular Galaxies

Retrograde infall of the intergalactic gas onto S-galaxy and activity of galactic nuclei

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