<?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>S0185-11012010000100014</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[A Compact Radio Counterpart to the Energetic X-ray Pulsar Associated with the TeV Gamma-Ray Source J1813-178]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dzib]]></surname>
<given-names><![CDATA[Sergio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodriguez]]></surname>
<given-names><![CDATA[Luis F.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Loinard]]></surname>
<given-names><![CDATA[Laurent]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Radiostronomía y Astrofísica ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2010</year>
</pub-date>
<volume>46</volume>
<numero>1</numero>
<fpage>153</fpage>
<lpage>157</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012010000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012010000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012010000100014&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Reportamos la detección de una fuente de radio compacta y variable coincidente con CXOU J181335.1-174957, el pulsar de rayos-X localizado cerca del centro de la remanente de supernova joven G12.82-0.02, la cual traslapa con la fuente TeV compacta HESS J1813-178. La fuente de radio compacta, que llamamos VLA J181335.1-174957, fue detectada en observaciones hechas a 4.86 GHz con el VLA en 2006. Nuevas observaciones hechas con el VLA en 2009 no detectan la fuente a un nivel 1.9±0.7 veces (2.8&#963;) más bajo que el de 2006. Sugerimos que VLA J181335.1-174957 podría estar relacionada con alguna de las recientemente detectadas clases de pulsares de radio variables, pero no podemos alcanzar una conclusión más sólida.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[We report the detection of a time-variable, compact radio source coincident with CXOU J181335.1-174957, the X-ray pulsar near the center of the young radio supernova remnant G12.82-0.02, which overlaps the compact TeV source HESS J1813-178. The compact radio source, named VLA J181335.1-174957, was detected in 4.86 GHz VLA observations made in 2006. New VLA observations made in 2009 do not detect the source at a level 1.9±0.7 times (2.8&#963;) lower than that of 2006. We suggest that VLA J181335.1-174957 may be related to one of the recently detected classes of variable radio pulsars but cannot reach a firmer conclusion.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[ISM: individual (G12.82-0.02)]]></kwd>
<kwd lng="en"><![CDATA[ISM: supernova remnants]]></kwd>
<kwd lng="en"><![CDATA[pulsars: individual (CXOU J181335.1-174957)]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>A Compact Radio Counterpart to the Energetic X&#150;ray Pulsar Associated with the TeV Gamma&#150;Ray Source J1813&#150;178</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Sergio Dzib<sup>1</sup>, Luis F. Rodriguez<sup>1</sup>, and Laurent Loinard<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> Centro de Radiostronom&iacute;a y Astrof&iacute;sica, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Apdo. Postal 3&#150;72 (Xangari), 58089 Morelia, Michoac&aacute;n, Mexico. (<a href="mailto:s.dzib@crya.unam.mx">s.dzib@crya.unam.mx</a>, <a href="mailto:l.loinard@crya.unam.mx">l.loinard@crya.unam.mx</a>, <a href="mailto:l.rodriguez@crya.unam.mx">l.rodriguez@crya.unam.mx</a>).</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Received 2009 November 4    <br> Accepted 2010 February 4</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>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Reportamos la detecci&oacute;n de una fuente de radio compacta y variable coincidente con CXOU J181335.1&#150;174957, el pulsar de rayos&#150;X localizado cerca del centro de la remanente de supernova joven G12.82&#150;0.02, la cual traslapa con la fuente TeV compacta HESS J1813&#150;178. La fuente de radio compacta, que llamamos VLA J181335.1&#150;174957, fue detectada en observaciones hechas a 4.86 GHz con el VLA en 2006. Nuevas observaciones hechas con el VLA en 2009 no detectan la fuente a un nivel 1.9&plusmn;0.7 veces (2.8<i>&#963;</i>) m&aacute;s bajo que el de 2006. Sugerimos que VLA J181335.1&#150;174957 podr&iacute;a estar relacionada con alguna de las recientemente detectadas clases de pulsares de radio variables, pero no podemos alcanzar una conclusi&oacute;n m&aacute;s s&oacute;lida.</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 report the detection of a time&#150;variable, compact radio source coincident with CXOU J181335.1&#150;174957, the X&#150;ray pulsar near the center of the young radio supernova remnant G12.82&#150;0.02, which overlaps the compact TeV source HESS J1813&#150;178. The compact radio source, named VLA J181335.1&#150;174957, was detected in 4.86 GHz VLA observations made in 2006. New VLA observations made in 2009 do not detect the source at a level 1.9&plusmn;0.7 times (2.8<i>&#963;</i>) lower than that of 2006. We suggest that VLA J181335.1&#150;174957 may be related to one of the recently detected classes of variable radio pulsars but cannot reach a firmer conclusion.</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Key Words: </i></b>ISM: individual (G12.82&#150;0.02) &#151; ISM: supernova remnants &#151; pulsars: individual (CXOU J181335.1&#150;174957).</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/v46n1/v46n1a14.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>REFERENCES</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">Abdo, A. 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