Lenticular galaxy IC 719: current building of the counterrotating large-scale stellar disk

Abstract

We have obtained and analyzed long-slit spectral data for the lenticular galaxy IC 719. In this gas-rich S0 galaxy, its large-scale gaseous disk counterrotates the global stellar disk. Moreover in the IC 719 disk we have detected a secondary stellar component corotating the ionized gas. By using emission-line intensity ratios, we have proved the gas excitation by young stars and so are claiming current star formation, most intense in a ring-like zone at the radius of 10" (1.4 kpc). The oxygen abundance of the gas in the starforming ring is about half of the solar abundance. Since the stellar disk remains dynamically cool, we conclude that smooth prolonged accretion of the external gas from a neighboring galaxy provides urrent building of the thin large-scale stellar disk.

10 pages, 9 figures, accepted for publication in The Astophysical Journal

References in corpus (4)

• The Host Galaxies and Classification of Active Galactic Nuclei
• Evolution of dwarf early-type galaxies I. Spatially resolved stellar populations and internal kinematics of Virgo cluster dE/dS0 galaxies
• Kinematics and stellar populations of the dwarf elliptical galaxy IC 3653
• The planets capture model of V838 Monocerotis: conclusions for the penetration depth of the planet/s

Cited by in corpus (27)

• Evidence for the formation of the young counter-rotating stellar disk from gas acquired by IC 719
• Formation of S0 galaxies through mergers. Evolution in the Tully-Fisher relation since $z\sim 1$
• GASP. XII. The variety of physical processes occurring in a single galaxy group in formation
• Decoupled gas kinematics in isolated S0 galaxies
• Extreme kinematic misalignment in IllustrisTNG galaxies: the origin, structure and internal dynamics of galaxies with a large-scale counterrotation
• Stellar counter-rotation in lenticular galaxy NGC 448
• The properties and the formation mechanism of the stellar counter-rotating components in NGC 4191
• SDSS-IV MaNGA: Integral-field kinematics and stellar population of a sample of galaxies with counter-rotating stellar disks selected from about 4000 galaxies
• Re-growth of stellar disks in mature galaxies: The two component nature of NGC 7217 revisited with VIRUS-W
• The effects of stellar dynamics on the X-ray emission of flat early-type galaxies
• Double-peak emission line galaxies in the SDSS catalogue. A minor merger sequence
• An excessively massive thick disc of the enormous edge-on lenticular galaxy NGC7572
• BAYES-LOSVD: a bayesian framework for non-parametric extraction of the line-of-sight velocity distribution of galaxies
• Disk heating and bending instability in galaxies with counterrotation
• The properties of the kinematically distinct components in NGC 448 and NGC 4365
• Two interacting galaxies hiding as one, revealed by MaNGA
• Kinematic and stellar population properties of the counter-rotating components in the S0 galaxy NGC 1366
• The relative efficiencies of bars and clumps in driving disc stars to retrograde motion
• Spectral decomposition of the stellar kinematics in the polar disk galaxy NGC 4650A
• Atomic Hydrogen Clues to the Formation of Counterrotating Stellar Discs
• Tilted outer and inner structures in edge-on galaxies?
• The study of two barred galaxies with curious kinematical features
• Star formation in outer rings of S0 galaxies. IV. NGC 254 -- a double-ringed S0 with gas counter-rotation
• The metallicity and elemental abundance maps of kinematically atypical galaxies for constraining minor merger and accretion histories
• The external origin of the polar gaseous disk of the S0 galaxy IC 5181
• Stellar CoRGI in MaNGA: Stellar Counterrotating Galaxies Identified in the MaNGA Survey
• A group of merging galaxies falling onto Abell 2142