Circumnuclear Structures in the Interacting Seyfert Galaxy NGC 1241: Kinematics and Optical/Infrared Morphology

摘要: We studied the spiral pattern in inner 65 (1'' = 257 pc) central regions of interacting active nucleus galaxy NGC 1241 using Gemini North Telescope high-resolution Ks- and J-band images Hubble Space (HST) Paα H- (V + R)-band with high resolution range from ~01 to ~03 along intermediate large-scale spectroscopy Multifunction Spectrograph at Cordoba Observatory Argentina. Our analysis emission revealed a faint two-armed leading ending 56 × 34 clumpy ring discovered by Boker coworkers, harboring 16 long barlike structure almost perpendicular bar 1241. When we applied two-dimensional Fourier circumnuclear scales, found that two-arm trailing mode was dominant while showed more complex structural features strong one-armed mode. One-dimensional corotation (CR) located outward edge bar. kinematics data gave an angular speed ΩCN 350 ± 50 km s-1 kpc-1 for pattern. The rotation curve is just inside Lindblad resonance (ILR), which has radius about r ~ 1 kpc. also found, within uncertainties present such measurements, outer (OLR) coincident ILR, indicating possible connection between global dynamics. Nevertheless, estimated molecular gas fraction (≥13%) region point nuclear formation via self-gravitational instability.