ar X iv : a st ro - p h / 02 03 02 7 v 1 3 M ar 2 00 2 HYDRODYNAMIC SIMULATIONS FOR THE NUCLEAR MORPHOLOGY OF NGC 4314
نویسنده
چکیده
Received ; accepted – 2 – 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.
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1 ST European Coordinating Facility, European Southern Observatory, K.-Schwarzschild-Strasse 2, D-85748 Garching bei Muenchen, Germany 2 Osservatorio Astronomico di Trieste, via Tiepolo 11, I-34131 Trieste, Italy 3 European Southern Observatory, K.-Schwarzschild-Strasse 2, D-85748 Garching bei Muenchen, Germany 4 Osservatorio Astronomico di Roma, via dell’Osservatorio 2, Monteporzio, Italy 5 Os...
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