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Galaxies 2016, 4(1), 1; doi:10.3390/galaxies4010001

Hidden Imprints of Minor Merging in Early-Type Galaxies: Inner Polar Rings and Inclined Large-Scale Gaseous Disks In S0s

Sternberg Astronomical Institute, Lomonosov Moscow State University, University av. 13, Moscow 119991, Russia
Academic Editors: José Alfonso López Aguerri, Enrichetta Iodice and Alexei Moiseev
Received: 15 October 2015 / Revised: 15 December 2015 / Accepted: 16 December 2015 / Published: 24 December 2015
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Abstract

I discuss my latest observational data and ideas about decoupled gaseous subsystems in nearby lenticular galaxies. As an extreme case of inclined gaseous disks, I demonstrate a sample of inner polar disks, derive their incidence, about 10% among the volume-limited nearby S0 galaxies, and discuss their origin. However, large-scale decoupled gaseous disks at intermediate inclinations are also a rather common phenomenon among the field S0 galaxies. I suggest that the geometry of outer gas accretion and the final morphology of the galaxy may be tightly related: inclined gas infall may prevent star formation in the accreted disk and force the disk galaxy to be a lenticular. View Full-Text
Keywords: lenticular galaxies; evolution of galaxies; galaxies: interstellar matter; galaxies: kinematics and dynamics; 98.52.Lp, 98.58.Ay, 98.62.Ai, 98.62.Hr, 98.62.Lv lenticular galaxies; evolution of galaxies; galaxies: interstellar matter; galaxies: kinematics and dynamics; 98.52.Lp, 98.58.Ay, 98.62.Ai, 98.62.Hr, 98.62.Lv
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Sil’chenko, O. Hidden Imprints of Minor Merging in Early-Type Galaxies: Inner Polar Rings and Inclined Large-Scale Gaseous Disks In S0s. Galaxies 2016, 4, 1.

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