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

Galaxies

Olga Sil𠆜henko¹  José Alfonso López Aguerri¹  Enrichetta Iodice¹ 

[1] Sternberg Astronomical Institute, Lomonosov Moscow State University, University av. 13, Moscow 119991, Russia

关键词: lenticular galaxies;    evolution of galaxies;    galaxies: interstellar matter;    galaxies: kinematics and dynamics;   

DOI  :  10.3390/galaxies4010001

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the author; licensee MDPI, Basel, Switzerland.