<?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>S0185-11012018000100013</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[In situ orbit extraction from live, high precision collisions simulations of systems formed by cold collapse]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Noriega-Mendoza]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar]]></surname>
<given-names><![CDATA[L. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Texas at El Paso Departamento de Física ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>EUA</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Astronomía ]]></institution>
<addr-line><![CDATA[Ensenada ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>54</volume>
<numero>1</numero>
<fpage>0</fpage>
<lpage>0</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012018000100013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012018000100013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012018000100013&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Absract We performed high precision, N -body simulations of the cold collapse of initially spherical, collisionless systems using the gyrfalcon code of Dehnen (2000). The collapses produce very prolate spheroidal configurations. After the collapse, the systems are simulated for 85 and 170 half-mass radius dynamical timescales, during which energy conservation is better than 0.005%. We use this period to extract individual particle orbits directly from the simulations. We then use the taxon code of Carpintero and Aguilar (1998) to classify 1 to 1.5% of the extracted orbits from our final, relaxed configurations: less than 15% are chaotic orbits, 30% are box orbits and 60% are tube orbits (long and short axis). Our goal has been to prove that direct orbit extraction is feasible, and that there is no need to &#8220;freeze&#8221; the final N -body system configuration to extract a time-independent potential.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Realizamos una serie de simulaciones de N-cuerpos de alta precisión del colapso frío de sistemas no colisionales inicialmente esféricos, con el código gyrfalcon de Dehnen (2000). Nuestros colapsos generan configuraciones muy prolatas. Después de esta fase, simulamos nuestros sistemas durante 85 y 170 tiempos dinámicos correspondientes al radio medio de masa. La conservación de la energía total es mejor que 0.005%. Extraemosórbitas de partículas individuales directamente de las simulaciones. Usamos el código taxon de Carpintero y Aguilar (1998) para clasificar 1 a 1.5% de lasórbitas extraídas de nuestras configuraciones relajadas finales: menos del 15% sonórbitas caóticas. Demostramos que la extracción orbital directa es posible, y que no es necesario &#8220;congelar&#8221; la configuración final del sistema de N -cuerpos para extraer un potencial gravitacional independiente del tiempo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[galaxies: kinematics and dynamics]]></kwd>
<kwd lng="en"><![CDATA[methods: numerical]]></kwd>
</kwd-group>
</article-meta>
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