Stellar nuclei and inner polar disks in lenticular galaxies

Abstract

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 integral-field 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.

25 pages, 13 figures

References in corpus (8)

• The Atlas3D Project - XXX. Star formation histories and stellar population scaling relations of early-type galaxies
• Population Synthesis in the Blue IV: Accurate Model Predictions for Lick Indices and UBV Colors in Single Stellar Populations
• The Metallicity of Galaxy Disks: Infall versus Outflow
• The SAURON project - VI. Line strength maps of 48 elliptical and lenticular galaxies
• The Formation of Polar Disk Galaxies
• Building gas rings and rejuvenating S0 galaxies through minor mergers
• Catalog of Nearby Isolated Galaxies in the Volume z<0.01
• Properties of Stellar Populations in Isolated Lenticular Galaxies

Cited by in corpus (4)

• Disky elliptical galaxies and the allegedly over-massive black hole in the compact massive `ES' galaxy NGC 1271
• Double-peak emission line galaxies in the SDSS catalogue. A minor merger sequence
• Star-forming rings in lenticular galaxies: origin of the gas
• COUGS-DESI: A Catalog of Unusual Galaxies with Polar Structures in the DESI Legacy Imaging Surveys