M. Rozas
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 877, 22830 Ensenada, B. C., México (maite@astrosen.unam.mx)
Received 2007 June 12
Accepted 2007 November 8
RESUMEN
]]> En este trabajo, con simulaciones numéricas del medio interestelar, determinamos el patrón de velocidad y construimos un modelo dinámico para NGC 3359. Ésta es una galaxia espiral fuertemente barrada y estructuralmente compleja, incluyendo una zona anular con fuerte formación estelar. Presentamos simulaciones numéricas auto–consistentes del gas molecular de NGC 3359, y usando el potencial derivado de una imagen en la banda I, encontramos los parámetros responsables de la cinemática y de la morfología del gas observado. Los mejores resultados se han obtenido con un modelo con dos patrones de velocidad diferentes: la región central (hasta 15") que corresponde a la barra nuclear rota con una Ωs = 100 km s–1 kpc–1; y la barra principal, junto con la espiral externa, desacopladas de la región nuclear, que rota con una velocidad angular, Ωp = 27 km s–1 kpc–1. Este modelo reproduce bien la compleja estructura en Hα de la galaxia en la zona interna, la cual no puede ser explicada con un único patrón de velocidad.
ABSTRACT
In this work we have determined a dynamical model for NGC 3359. This is a strongly barred spiral galaxy with a complex structure, within which we can see an annular zone of intense star formation. In this work we present self consistent numerical simulations of molecular gas in NGC 3359; and using the potential derived from an I band image, we attempt to find the parameters responsible for the kinematics and morphology of the observed gas. The best results are obtained for a two pattern speed model: the central region (up to 15") corresponding to the nuclear bar which rotates with a Ωs=100 km s–1 kpc–1; and the main bar + outer spiral, decoupled from the nuclear region, which rotates with a angular velocity, Ωp = 27 km s–1 kpc–1. The model successfully reproduces the complex structure in Hα of the galaxy in the internal 20" zone, which cannot really be explained with a unique mode pattern.
Key Words: galaxies: individual (NGC 3359) — galaxies: kinematics and dynamics — galaxies: spiral
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