<?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>S0185-11012015000100005</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Interaction between the IGM and a dwarf galaxy]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lora]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Raga]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Grebel]]></surname>
<given-names><![CDATA[E. K.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universitat Heidelberg Zentrum für Astronomie Astronomisches Rechen-Institut]]></institution>
<addr-line><![CDATA[Heidelberg Baden-Wurttemburg]]></addr-line>
<country>Alemania</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias Nucleares ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2015</year>
</pub-date>
<volume>51</volume>
<numero>1</numero>
<fpage>39</fpage>
<lpage>48</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012015000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012015000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012015000100005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las galaxias enanas son el tipo de objeto más común en el Universo y se cree que contienen grandes cantidades de materia oscura. Existen principalmente tres tipos morfológicos de galaxias enanas: elípticas enanas, esferoidales enanas, e irregulares enanas. Las galaxias irregulares enanas son particularmente interesantes en la evolución de galaxias enanas, ya que los predecesores de las galaxias esferoidales enanas pudieron haber sido muy similares a ellas. Entonces, debería observarse un mecanismo ligado a la pérdida de gas en las galaxias irregulares, e.g. remoción por presión de ariete (ram pressure stripping). En este artículo estudiamos la interacción entre el medio interestelar y un medio intergaláctico en movimiento relativo. Derivamos una solución de plasmón de choque débil que corresponde al balance entre la presión postchoque a proa y la presión estratificada del medio interestelar (que suponemos sigue la estratificación de un halo de materia obscura gravitacionalmente dominante). Comparamos nuestro modelo con simulaciones numéricas previamente publicadas y con la nube de HI que rodea las galaxias irregulares enanas Ho II y Pegaso. Mostramos que este tipo de comparación provee una forma sencilla para estimar el número de Mach del flujo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Dwarf Galaxies are the most common objects in the Universe and are believed to contain large amounts of dark matter. There are mainly three morphologic types of dwarf galaxies: dwarf ellipticals, dwarf spheroidals and dwarf irregulars. Dwarf irregular galaxies are particularly interesting in dwarf galaxy evolution, since dwarf spheroidal predecessors could have been very similar to them. Therefore, a mechanism linked to gas-loss in dwarf irregulars should be observed, i.e. ram pressure stripping. In this paper, we study the interaction between the ISM of a dwarf galaxy and a flowing IGM. We derive the weak-shock, plasmon solution corresponding to the balance between the post-bow shock pressure and the pressure of the stratified ISM (which we assume follows the fixed stratification of a gravitationally dominant dark matter halo). We compare our model with previously published numerical simulations and with the observed shape of the HI cloud around the Ho II and Pegasus dwarf irregular galaxies. We show that such a comparison provides a straightforward way for estimating the Mach number of the impinging flow.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[galaxies]]></kwd>
<kwd lng="en"><![CDATA[ISM]]></kwd>
<kwd lng="en"><![CDATA[methods]]></kwd>
<kwd lng="en"><![CDATA[methods]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="center"><font face="verdana" size="4"><b>Interaction between the IGM and a dwarf galaxy</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>V. Lora,<sup>1</sup> A. C. Raga,<sup>2</sup> and E. K. Grebel<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"><sup><i>1</i></sup> <i>Astronomisches Rechen&#45;Institut, Zentrum f&uuml;r Astronomie der Universit&auml;t Heidelberg, M&ouml;nchhofstr. 12&#45;14, 69120 Heidelberg, Germany</i> (<a href="mailto:grebel@ari.uni&#45;heidelberg.de">grebel@ari.uni&#45;heidelberg.de</a>, <a href="mailto:vlora@ari.uni&#45;heidelberg.de">vlora@ari.uni&#45;heidelberg.de</a>).</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>2</i></sup> <i>Instituto de Ciencias Nucleares, Universidad Nacional Aut&oacute;noma de M&eacute;xico, UNAM, Apdo. Postal 70&#45;543, C. P. 04510, M&eacute;xico, D. F., M&eacute;xico</i> (<a href="mailto:raga@nucleares.unam.mx">raga@nucleares.unam.mx</a>).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Received July 15 2014.    <br> 	Accepted November 6 2014.</font></p>  	    ]]></body>
<body><![CDATA[<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">Las galaxias enanas son el tipo de objeto m&aacute;s com&uacute;n en el Universo y se cree que contienen grandes cantidades de materia oscura. Existen principalmente tres tipos morfol&oacute;gicos de galaxias enanas: el&iacute;pticas enanas, esferoidales enanas, e irregulares enanas. Las galaxias irregulares enanas son particularmente interesantes en la evoluci&oacute;n de galaxias enanas, ya que los predecesores de las galaxias esferoidales enanas pudieron haber sido muy similares a ellas. Entonces, deber&iacute;a observarse un mecanismo ligado a la p&eacute;rdida de gas en las galaxias irregulares, e.g. remoci&oacute;n por presi&oacute;n de ariete (<i>ram pressure stripping</i>). En este art&iacute;culo estudiamos la interacci&oacute;n entre el medio interestelar y un medio intergal&aacute;ctico en movimiento relativo. Derivamos una soluci&oacute;n de plasm&oacute;n de choque d&eacute;bil que corresponde al balance entre la presi&oacute;n postchoque a proa y la presi&oacute;n estratificada del medio interestelar (que suponemos sigue la estratificaci&oacute;n de un halo de materia obscura gravitacionalmente dominante). Comparamos nuestro modelo con simulaciones num&eacute;ricas previamente publicadas y con la nube de HI que rodea las galaxias irregulares enanas Ho II y Pegaso. Mostramos que este tipo de comparaci&oacute;n provee una forma sencilla para estimar el n&uacute;mero de Mach del flujo.</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">Dwarf Galaxies are the most common objects in the Universe and are believed to contain large amounts of dark matter. There are mainly three morphologic types of dwarf galaxies: dwarf ellipticals, dwarf spheroidals and dwarf irregulars. Dwarf irregular galaxies are particularly interesting in dwarf galaxy evolution, since dwarf spheroidal predecessors could have been very similar to them. Therefore, a mechanism linked to gas&#45;loss in dwarf irregulars should be observed, i.e. <i>ram pressure stripping</i>. In this paper, we study the interaction between the ISM of a dwarf galaxy and a flowing IGM. We derive the weak&#45;shock, plasmon solution corresponding to the balance between the post&#45;bow shock pressure and the pressure of the stratified ISM (which we assume follows the fixed stratification of a gravitationally dominant dark matter halo). We compare our model with previously published numerical simulations and with the observed shape of the HI cloud around the Ho II and Pegasus dwarf irregular galaxies. We show that such a comparison provides a straightforward way for estimating the Mach number of the impinging flow.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key Words:</b> galaxies: dwarf &#151; ISM: structure &#151; methods: analytical &#151; methods: numerical.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmaa/v51n1/v51n1a5.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
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