Circumnuclear structures in the interacting Seyfert galaxy NGC 1241: kinematics and optical/IR morphology

Details Circumnuclear structures in the interacting Seyfert galaxy NGC 1241: kinematics and optical/IR morphology Circumnuclear structures in the interacting Seyfert galaxy NGC 1241: kinematics and optical/IR morphology

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23...17d&link_type=abstract

Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 17-17

Astronomy and Astrophysics

Astronomy

Scientific paper

We studied the spiral pattern in the inner 6.5" (1" = 257 pc) central regions of the interacting active nucleus galaxy NGC1241 using: Gemini North Telescope high resolution Ks and J band images; Hubble Space Telescope Paschen alpha, H and (V+R) band images with high spatial resolution in the range 0.1" to 0.3"; intermediate to large scale spectroscopy using the multifunction spectrograph at the Córdoba observatory in Argentina. Our analysis of Palpha emission images revealed a faint two-armed leading spiral pattern ending in a 5.6" x 3.4" clumpy ring harboring a 1.6" long bar-like structure, almost perpendicular to the large-scale bar of NGC 1241. When we applied 2-D Fourier analysis at circumnuclear scales we found that a two arm trailing mode was dominant in Ks, and J bands images while the (V+R) band images showed more complex structural features with a strong one-armed trailing mode. 1-D Fourier analysis showed a corotation (CR) located outwards from the edge of the Palpha bar. Our kinematics data gave an angular speed of 350km/sec-1/kpc-1 for the trailing mode pattern. The rotation curve showed that the circumnuclear ring is located just inside the large-scale pattern Inner Lindblad Ressonance ILR which has a radius of about 1 kpc. We also found, within the uncertainties present in such measurements,that the Outer Linblad Ressonance (OLR) of the circumnuclear pattern is coincident with the large-scale pattern ILR, indicating a possible connection between circumnuclear and global dynamics. The estimated high molecular gas fraction > 13% at the central region of NGC 1241, and the inner pattern high angular speed point to a nuclear bar formation via self-gravitational instability.

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