<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0185-1101</journal-id>
<journal-title><![CDATA[Revista mexicana de astronomía y astrofísica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. astron. astrofis]]></abbrev-journal-title>
<issn>0185-1101</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Astronomía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0185-11012017000200009</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Detecting the Growth of Structures in Pure Stellar Disk Models]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valencia-Enríquez]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Puerari]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chaves-Velasquez]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Astrofísica, Óptica y Electrónica  ]]></institution>
<addr-line><![CDATA[Santa María Tonantzintla Puebla]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>53</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012017000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012017000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012017000200009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT We performed a series of 3D N-body simulations where the initial conditions were chosen to get two sets of models; unbarred and barred ones. In this work, we analyze the growth of spirals and bar structures using 1D, and 2D Fourier transform (FT) methods. Spectrograms and diagrams of the amplitude of the Fourier coefficients as a function of time, radius and pitch angle show that the general morphology of our modeled galaxies is due to the superposition of structures which have different values of pitch angle and number of arms. Also, in barred models a geometric classification of orbits from the bar reference frame was done, showing that the barred potential and the Lagrangian points L 4 and L 5 catch approximately one-third of the total disk mass.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se ejecutaron simulaciones de N-cuerpos en 3D donde las condiciones iniciales fueron escogidas para obtener dos conjuntos de modelos; no-barrados y barrados. Se analiza el crecimiento de las estructuras espirales y/o de barra usando transformadas de Fourier en 1D y 2D. Los espectrogramas y los diagramas de la amplitud de los coeficientes de Fourier en función del tiempo, radio y ángulo de enrollamiento muestran que la morfología de nuestros modelos se debe a la superposición de diversas estructuras con valores diferentes para el ángulo de enrollamiento, número de brazos y velocidad angular. Además, en los modelos con barra, se estudió las ´orbitas de las partículas en el sistema de referencia de la barra. Una clasificación geométrica de las órbitas muestra que el potencial de la barra y los puntos lagrangianos L 4 y L 5 capturan aproximadamente 1/3 de la masa total del disco.]]></p></abstract>
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<kwd lng="en"><![CDATA[galaxies: kinematics and dynamics]]></kwd>
<kwd lng="en"><![CDATA[galaxies: spiral]]></kwd>
<kwd lng="en"><![CDATA[galaxies: structure]]></kwd>
<kwd lng="en"><![CDATA[methods]]></kwd>
<kwd lng="en"><![CDATA[numerical]]></kwd>
</kwd-group>
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