Bibcode
van de Ven, G.; Karlsson, R.; Hernandez, O.; Font, J.; Piñol-Ferrer, N.; Fathi, K.; Carignan, C.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 438, Issue 2, p.971-982
Advertised on:
2
2014
Número de citas
17
Número de citas referidas
16
Descripción
We present the first galactic-scale model of the gas dynamics of the
prototype barred Seyfert 1 galaxy NGC 1097. We use large-scale FaNTOmM
Fabry-Perot interferometric data covering the entire galactic disc and
combine the distribution and kinematics maps with high-resolution
two-dimensional spectroscopy from the Gemini telescope. We build a
dynamical model for the gravitational potential by applying the analytic
solution to the equations of motion, within the epicyclic approximation.
Our model reproduces all the significant kinematic and structural
signatures of this galaxy. We find that the primary bar is 7.9 ±
0.6 kpc long and has a pattern speed of 36 ± 2 km s-1
kpc-1. This places the corotation radius at 8.6 ± 0.5
kpc, the outer Lindblad resonance at 14.9 ± 0.9 kpc and two inner
Lindblad resonances at 60 ± 5 pc and 2.9 ± 0.1 kpc. These
derivations lead to a ratio of the corotation radius over bar length of
1.0-1.2, which is in agreement with the predictions of simulations for
fast galaxy bars. Our model presents evidence that the circumnuclear
ring in this galaxy is not located near any of the resonance radii in
this galaxy. The ring might have once formed at the outer inner Lindblad
resonance radius, and it has been migrating inwards, towards the centre
of the galactic gravitational potential.
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