<?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>S0185-11012011000200007</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Variable Jets with Non-Top Hat Ejection Cross Sections: A Model For The Knots of the HH 34 Jet]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Raga]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Noriega-Crespo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kajdic]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Colle]]></surname>
<given-names><![CDATA[F. De]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Cámara]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Esquivel]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de Mexico Instituto de Ciencias Nucleares ]]></institution>
<addr-line><![CDATA[ D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="A02">
<institution><![CDATA[,California Institute of Technology Spitzer Science Center ]]></institution>
<addr-line><![CDATA[Pasadena CA]]></addr-line>
<country>USA</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica ]]></institution>
<addr-line><![CDATA[ D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="A04">
<institution><![CDATA[,University of California Astronomy and Astrophysics Department ]]></institution>
<addr-line><![CDATA[Santa Cruz CA]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2011</year>
</pub-date>
<volume>47</volume>
<numero>2</numero>
<fpage>277</fpage>
<lpage>288</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012011000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012011000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012011000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Calculamos modelos axisimétricos, con una variación sinusoidal (de un modo) y un perfil de sección recta inicial de velocidad. Encontramos que para cocientes de velocidad borde a centro decrecientes, uno obtiene superficies de trabajo con choques de proa con alas progresivamente más extendidas. Estas alas producen emisión de [S II] que parcialmente llena las regiones entre los nudos en los mapas de emision predichos. Luego calculamos modelos de 3 modos (con parámetros apropiados para el chorro HH 34), y comparamos los mapas de emisión predichos con imágenes del archivo del HST de HH 34. Encontramos que un modelo con cociente de velocidades borde a centro moderado produce estructuras de nudos con morfologías y variabilidades temporales muy parecidas a las observadas en HH 34.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[We compute axisymmetric, single-sinusoidal mode variable ejection models with a non-top hat ejection velocity cross section. We find that for decreasing edge-to-center velocity ratios one obtains internal working surfaces with progressively more extended bow shock wings. These wings produce [S II] emission which partially fills in the inter-knot regions in predicted intensity maps. We then compute 3-mode models (with parameters appropriate for the HH 34 jet), and compare predicted intensity maps with archival HST images of HH 34. We find that a model with a moderate edge-to-center velocity ratio produces knot structures with morphologies and time-variabilites with clear similarities to the observations of HH 34.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[ISM]]></kwd>
<kwd lng="en"><![CDATA[ISM]]></kwd>
<kwd lng="en"><![CDATA[stars]]></kwd>
<kwd lng="en"><![CDATA[stars]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Variable Jets with Non&#150;Top Hat Ejection Cross Sections: A Model For The Knots of the HH 34 Jet</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>A. C. Raga,<sup>1</sup> A. Noriega&#150;Crespo,<sup>2</sup> P. Kajdic,<sup>3</sup> F. De Colle,<sup>4</sup> D. L&oacute;pez&#150;C&aacute;mara,<sup>1</sup> and A. Esquivel<sup>1</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Instituto de Ciencias Nucleares, Universidad Nacional Aut&oacute;noma de Mexico, Apdo. Postal 70&#150;543, 04510 D.F., Mexico</i> (<a href="mailto:raga@nucleares.unam.mx">raga@nucleares.unam.mx</a>, <a href="mailto:diegorretas@gmail.com">diegorretas@gmail.com</a>.)</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Spitzer Science Center, California Institute of Technology, Pasadena, CA 91125, USA</i> (<a href="mailto:alberto@ipac.caltech.edu">alberto@ipac.caltech.edu</a>).</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>3</sup> Instituto de Geof&iacute;sica, Universidad Nacional Aut&oacute;noma de M&eacute;xico, 04510 D.F., Mexico</i> (<a href="mailto:pri&#150;moz@geofisica.unam.mx">pri&#150;moz@geofisica.unam.mx</a>)</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>4 </sup>Astronomy and Astrophysics Department, University of California, Santa Cruz, CA 95064, USA</i> (<a href="mailto:fabio@ucolick.org">fabio@ucolick.org</a>).</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Received 2010 December 15    <br>   Accepted 2011 May 9</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>     <p align="justify"><font face="verdana" size="2">Calculamos modelos axisim&eacute;tricos, con una variaci&oacute;n sinusoidal (de un modo) y un perfil de secci&oacute;n recta inicial de velocidad. Encontramos que para cocientes de velocidad borde a centro decrecientes, uno obtiene superficies de trabajo con choques de proa con alas progresivamente m&aacute;s extendidas. Estas alas producen emisi&oacute;n de &#91;S II&#93; que parcialmente llena las regiones entre los nudos en los mapas de emision predichos. Luego calculamos modelos de 3 modos (con par&aacute;metros apropiados para el chorro HH 34), y comparamos los mapas de emisi&oacute;n predichos con im&aacute;genes del archivo del HST de HH 34. Encontramos que un modelo con cociente de velocidades borde a centro moderado produce estructuras de nudos con morfolog&iacute;as y variabilidades temporales muy parecidas a las observadas en HH 34.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>ABSTRACT</b></font></p>     <p align="justify"><font face="verdana" size="2">We compute axisymmetric, single&#150;sinusoidal mode variable ejection models with a non&#150;top hat ejection velocity cross section. We find that for decreasing edge&#150;to&#150;center velocity ratios one obtains internal working surfaces with progressively more extended bow shock wings. These wings produce &#91;S II&#93; emission which partially fills in the inter&#150;knot regions in predicted intensity maps. We then compute 3&#150;mode models (with parameters appropriate for the HH 34 jet), and compare predicted intensity maps with archival HST images of HH 34. We find that a model with a moderate edge&#150;to&#150;center velocity ratio produces knot structures with morphologies and time&#150;variabilites with clear similarities to the observations of HH 34.</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Key Words:</i></b> ISM: jets and outflows &#151; ISM: kinematics and dynamics &#151; stars: mass&#150;loss &#151; stars: pre&#150;main sequence.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><a href="/pdf/rmaa/v47n2/v47n2a7.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>ACKNOWLEDGMENTS</b></font></p>     <p align="justify"><font face="verdana" size="2">This work was supported by the Conacyt grants 61547, 101356 and 101975. We acknowledge the support of E. Palacios of the ICN&#150;Universidad Nacional Aut&oacute;noma de Mexico computing staff. We also thank an anonymous referee for helpful comments.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>REFERENCES</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">Cant&oacute;, J., Raga, A. C., &amp; D'Alessio, P. 2000, MNRAS, 313, 656.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7435246&pid=S0185-1101201100020000700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">De Colle, F. 2011, in IAU Symp. 275, Jets at all Scales, ed. G. A. Romero, R. A. Sunyaev, &amp; T. Belloni (Cambridge: Cambridge Univ. Press), 392.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7435248&pid=S0185-1101201100020000700002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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