<?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>S0185-11012016000100133</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Testing the isotropy of the Hubble expansion]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Migkas]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Plionis]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A03"/>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,University of Bonn Argelander Institute for Astronomy (AlfA) ]]></institution>
<addr-line><![CDATA[Bonn ]]></addr-line>
<country>Germany</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Aristotle University of Thessaloniki Astrophysics, Astronomy & Mechanics Sector, Physics Department ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Greece</country>
</aff>
<aff id="A03">
<institution><![CDATA[,National Observatory of Athens IAASARS ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Greece</country>
</aff>
<aff id="A04">
<institution><![CDATA[,INAOE  ]]></institution>
<addr-line><![CDATA[Puebla ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<volume>52</volume>
<numero>1</numero>
<fpage>133</fpage>
<lpage>141</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012016000100133&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012016000100133&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012016000100133&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: We have used the Union2.1 SNIa compilation to search for possible Hubble expansion anisotropies, dividing the sky in 9 solid angles containing roughly the same number of SNIa, as well as in two Galactic hemispheres. We identified only one sky region, containing 82 SNIa (~15% of total sample with z &gt; 0.02), that indeed appears to share a Hubble expansion significantly different from the rest of the sample. However, this behaviour can be attributed to the joint "erratic" behaviour of only three SNIa and not to an anisotropic expansion. We also find that the northern and southern galactic hemispheres have different cosmological parameter solutions, but still not significant enough to support a Hubble expansion anisotropy. We conclude that even a few outliers can induce artificial indications of anisotropies, when the number of analysed SNIa is relatively small.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Hemos utilizado la compilación Union2.1 de SNIa para buscar posibles anisotropías de la expansión de Hubble, dividiendo el cielo en 9 ángulos sólidos que contienen más o menos el mismo número de SNIa, así como en dos hemisíerios galácticos. Como resultado se identificó una región del cielo que contiene 82 SNIa (15% del total con z &gt; 0.02) y que parece tener un comportamiento de expansión Hubble muy diíerente del resto de la muestra. Sin embargo, la causa es un electo sistemático relacionado mayormente con el comportamiento "errático" de sólo tres SNIa. Además, el análisis por separado de los dos hemisíerios galácticos da como resultado diferentes parámetros cosmológicos, pero todavía no es suficientemente significativo para afirmar la detección de una anisotropía de la expansión Hubble. Concluimos que si se incluyen en el análisis unas pocas SNIa con valores atípicos pueden obtenerse indicaciones artificiales de anisotropías.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[cosmological parameters]]></kwd>
<kwd lng="en"><![CDATA[methods: statistical]]></kwd>
<kwd lng="en"><![CDATA[supernovae: general]]></kwd>
</kwd-group>
</article-meta>
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