<?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>S0185-11012007000100002</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[On the Magnetic Field Evolution in shell-like Supernova Remnants]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vukotic]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arbutina]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Uroševic]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Astronomical Observatory  ]]></institution>
<addr-line><![CDATA[ Serbia]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,University of Belgrade Faculty of Mathematics Department of Astronomy]]></institution>
<addr-line><![CDATA[Belgrade ]]></addr-line>
<country>Serbia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2007</year>
</pub-date>
<volume>43</volume>
<numero>1</numero>
<fpage>33</fpage>
<lpage>43</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012007000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012007000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012007000100002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este artículo aplicamos y discutimos un método para la determinación de la evolución del campo magnético en los remanentes de supernova (SNRs) a partir de la relación entre la luminosidad en radio a la frecuencia v y el diámetro (Lv - D). Asumimos que H evoluciona como H &#8734; D-&#948;, donde D es el diámetro del remanente. El valor &#948; <img border=0 width=20 height=15 src="../../../../../img/revistas/rmaa/v43n1/a2s1.jpg">1.2 se obtiene con la hipótesis de equipartición a partir de las ecuaciones del cálculo revisado de equipartición (REC) y usando la muestra de datos de la galaxia de brote estelar M82. Intentamos investigar si los remanentes de la supernova en M82 están en estado de equipartición o no, comparando la 6 empíricamente obtenida con el valor teórico esperado para equipartición. La diferencia entre el valor obtenido teóricamente para la equipartición con expansión adiabática (&#948; = 1.5) y el valor empírico obtenido aquí se puede explicar principalmente como debido a efectos de selección en la sensibilidad, que tienden a aplanar la pendiente de la relación Lv - D para las muestras extragalácticas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this paper we apply and discuss a method for the determination of the magnetic field (H) evolution in supernova remnants (SNRs) from radio luminosity at given frequency v to diameter (Lv - D) correlation. We assumed that H evolves as H &#8734; D-&#948;, where D is the diameter of the remnant. A value &#948; <img border=0 width=20 height=15 src="../../../../../img/revistas/rmaa/v43n1/a2s1.jpg"> 1.2 is obtained under the equipartition assumption from the equations for revised equipartition calculation (REC) and by using the data sample from the nearby starburst galaxy M82. We try to investigate whether or not SNRs in M82 are in the equipartition state. This is done by comparison of our empirically obtained &#948;with the theoretical value expected for equipartition conditions. The inconsistency between the value obtained for equipartition conditions and adiabatic expansion (&#948; = 1.5) and the value empirically obtained herein can be explained mainly by the influence of sensitivity selection effects which tend to flatten the slope of the Lv - D relations for extragalactic samples.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[GALAXIES: INDIVIDUAL (M82)]]></kwd>
<kwd lng="en"><![CDATA[MAGNETIC FIELDS]]></kwd>
<kwd lng="en"><![CDATA[METHODS: STATISTICAL]]></kwd>
<kwd lng="en"><![CDATA[RADIATION MECHANISMS: NON-THERMAL]]></kwd>
<kwd lng="en"><![CDATA[RADIO CONTINUUM: ISM]]></kwd>
<kwd lng="en"><![CDATA[SUPERNOVA REMNANTS]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>ON THE MAGNETIC FIELD EVOLUTION IN SHELL&#150;LIKE SUPERNOVA REMNANTS</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>B. Vukotic,<sup>1</sup> B. Arbutina,<sup>1</sup> and D. Uro&scaron;evic<sup>2</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> Astronomical Observatory, Volgina 7, 11160 Belgrade 74, Serbia (<a href="mailto:barbutina@aob.bg.ac.yu">bar</a><a href="mailto:barbutina@aob.bg.ac.yu">butina@aob.bg.ac.yu</a>, <a href="mailto:bvukotic@aob.bg.ac.yu">bvukotic@aob.bg.ac.yu</a>). </i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Department of Astronomy, Faculty of Mathematics, University of Belgrade, Studentski Trg 16, 11000 Belgrade, Serbia (<a href="mailto:dejanu@poincare.matf.bg.ac.yu">dejanu@poincare.matf.bg.ac.yu</a>).</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Received 2006 January 16    <br> Accepted 2006 October 6</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>     <p align="justify"><font face="verdana" size="2">En este art&iacute;culo aplicamos y discutimos un m&eacute;todo para la determinaci&oacute;n de la evoluci&oacute;n del campo magn&eacute;tico en los remanentes de supernova (SNRs) a partir de la relaci&oacute;n entre la luminosidad en radio a la frecuencia <i>v </i>y el di&aacute;metro (<i>L<sub>v</sub> </i>&#150; <i>D</i>)<i>. </i>Asumimos que <i>H </i>evoluciona como <i>H </i>&infin; <i>D<sup>&#150;&delta;</sup>, </i>donde <i>D </i>es el di&aacute;metro del remanente. El valor <i>&delta;</i><i> </i><img src="/img/revistas/rmaa/v43n1/a2s1.jpg"> 1.2 se obtiene con la hip&oacute;tesis de equipartici&oacute;n a partir de las ecuaciones del c&aacute;lculo revisado de equipartici&oacute;n (REC) y usando la muestra de datos de la galaxia de brote estelar M82. Intentamos investigar si los remanentes de la supernova en M82 est&aacute;n en estado de equipartici&oacute;n o no, comparando la <i>6 </i>emp&iacute;ricamente obtenida con el valor te&oacute;rico esperado para equipartici&oacute;n. La diferencia entre el valor obtenido te&oacute;ricamente para la equipartici&oacute;n con expansi&oacute;n adiab&aacute;tica (<i>&delta;</i> = 1.5) y el valor emp&iacute;rico obtenido aqu&iacute; se puede explicar principalmente como debido a efectos de selecci&oacute;n en la sensibilidad, que tienden a aplanar la pendiente de la relaci&oacute;n <i>L<sub>v</sub> &#151; D </i>para las muestras extragal&aacute;cticas.</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">In this paper we apply and discuss a method for the determination of the magnetic field <i>(H) </i>evolution in supernova remnants (SNRs) from radio luminosity at given frequency <i>v </i>to diameter <i>(L<sub>v</sub> &#151; D) </i>correlation. We assumed that <i>H </i>evolves as <i>H </i>&infin; <i>D<sup> &#150;&delta;</sup></i>, where <i>D </i>is the diameter of the remnant. A value <i>&delta; </i><img src="/img/revistas/rmaa/v43n1/a2s1.jpg"> 1.2 is obtained under the equipartition assumption from the equations for revised equipartition calculation (REC) and by using the data sample from the nearby starburst galaxy M82. We try to investigate whether or not SNRs in M82 are in the equipartition state. This is done by comparison of our empirically obtained <i>&delta;</i>with the theoretical value expected for equipartition conditions. The inconsistency between the value obtained for equipartition conditions and adiabatic expansion (<i><i>&delta;</i> = </i>1.5) and the value empirically obtained herein can be explained mainly by the influence of sensitivity selection effects which tend to flatten the slope of the <i>L<sub>v</sub> </i>&#151; <i>D </i>relations for extragalactic samples.</font></p>     <p align="justify"><font face="verdana" size="2"><i><b>Key Words: </b></i>GALAXIES:   INDIVIDUAL   (M82)      &#151; ISM:   MAGNETIC FIELDS&nbsp;&#151; &nbsp;METHODS:   STATISTICAL&nbsp;&#151; &nbsp; &nbsp; RADIATION MECHANISMS:   NON&#150;THERMAL&nbsp;&#151;&nbsp;RADIO   CONTINUUM: ISM       &#151; SUPERNOVA REMNANTS</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/v43n1/v43n1a2.pdf">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>ACKNOWLEDGEMENTS</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">The authors thank Dragana Momic and Ivanka Mutavdzic for a careful reading and correction of the manuscript, and an anonymous referee for comments and suggestions. The authors would also like to thank Prof. Rainer Beck for useful comments on the manuscript. This paper is a part of the project "Gaseous and Stellar Components of Galaxies: Interaction and Evolution" (No. 146012) supported by the Ministry of Science and Environmental Protection of Serbia.</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">Arbutina, B., &amp; Urosevic, D. 2005, MNRAS, 360, 76</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7420185&pid=S0185-1101200700010000200001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">Arbutina, B., Urosevic, D., Stankovic, M., &amp; Tesic, Lj. 2004, MNRAS, 350, 346</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7420186&pid=S0185-1101200700010000200002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">Bamba, A., Yamazaki, R., Yoshida, T., Terasawa, T., &amp; Koyama, K. 2005, ApJ, 621, 793 </font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7420187&pid=S0185-1101200700010000200003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">Beck, R., &amp; Krause, M. 2005, Astron. 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