Hydrodynamic Simulations for the Nuclear Morphology of NGC 4314

Abstract

We performed SPH simulations to study the nuclear morphology of a barred galaxy NGC 4314. We have constructed the mass models based on the results of a profile decomposition into disk, bulge, and bar components. Our models have three different nuclear structures according to the assumption about the nuclear bar: no nuclear bar, a synchronous nuclear bar and a fast nuclear bar. Our SPH simulations show that the morphology of the nuclear region of NGC 4314 which is characterized by an elongated ring/spiral of newly formed stars and HII regions, aligned nearly parallel to the primary bar can be understood in terms of the secular evolution driven by the non-axisymmetric potential. The slightly elongated and aligned nuclear ring of NGC 4314 can be formed by the strong barred potential and the moderate central concentration of the bulge mass with and without a nuclear bar. However, the nuclear spiral pattern can not be developed without a nuclear bar. The nuclear bar of NGC 4314 seems to rotate faster than the primary bar since the nuclear morphology induced by the synchronous nuclear bar is much different from the observed one.

9 pages

Cited by in corpus (9)

• Double-Barred Galaxies: I. A Catalog of Barred Galaxies with Stellar Secondary Bars and Inner Disks
• Double Bars, Inner Disks, and Nuclear Rings in Early-Type Disk Galaxies
• An Imaging Survey of Early-Type Barred Galaxies
• NGC 4314. IV. Photometry of Star Clusters with Hubble Space Telescope - History of Star Formation in the Vicinity of a Nuclear Ring
• Formation of Nuclear Spirals in Barred Galaxies
• The ratio of pattern speeds in double-barred galaxies
• Effect of Central Mass Concentration on the Formation of Nuclear Spirals in Barred Galaxies
• Are galactic disks dynamically influenced by dust?
• Nuclear Spirals as Signatures of Supermassive Black Holes