<?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>S0185-11012024000200241</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2024.60.02.04</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[X-ray analysis of Seyfert 1 galaxies with optical polarization: a test for unification models]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gudiño]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Bailón]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Longinotti]]></surname>
<given-names><![CDATA[A. L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guainazzi]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cerviño]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Robleto-Orús]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Astronomía ]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,European Space Astronomy Centre Quasar Science Resource S.L. for the European Space Agency ]]></institution>
<addr-line><![CDATA[Villanueva de la Cañada Madrid]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,European Space Agency European Space Research and Technology Centre ]]></institution>
<addr-line><![CDATA[ Noordwijk]]></addr-line>
<country>The Netherlands</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Centro de Astrobiología Instituto Nacional de Técnica Aeroespacial ]]></institution>
<addr-line><![CDATA[Villanueva de la Cañada Madrid]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>60</volume>
<numero>2</numero>
<fpage>241</fpage>
<lpage>260</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012024000200241&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012024000200241&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012024000200241&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In accordance with the AGN Unified Model, observed polarization can be related to the orientation of the line of sight with respect to the torus. AGN X-ray emission arises from the central region and carries the imprints of the obscuring material. We aim to test a unified scheme based on optical polarization using X-ray absorption. Using the XMM-Newton data of 19, optically polarized Seyfert 1 sources, we develop a systematic analysis by fitting a baseline model to test the presence of X-ray neutral or ionized (warm) absorption. We find that 100% of the polar-polarized sources show the presence of absorption, with 70% favoring the presence of a warm absorber. In contrast, the equatorial-polarized sources show a fraction of absorbed spectra of 75%, with only 50% consistent with the presence of a warm absorber.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen De acuerdo con el Modelo Unificado AGN, la polarización observada se puede relacionar con la orientación de la línea de visión con respecto al toro. La emisión de rayos X de un AGN surge de la región central y lleva las huellas del material oscurecedor. Nuestro objetivo es probar un esquema unificado basado en polarización óptica mediante absorción de rayos X. Utilizando los datos XMM-Newton de 19 fuentes Seyfert 1 ópticamente polarizadas, desarrollamos un análisis sistemático para ajustar un modelo de referencia y probar la presencia de absorción neutra o ionizada. Encontramos que el 100% de las fuentes con polarización polar muestran la presencia de absorción, y el 70% favorece la presencia de un absorbedor tibio. Por el contrario, las fuentes con polarización ecuatorial muestran una fracción de espectros absorbidos del 75%, y sólo el 50% es consistente con la presencia de un absorbente tibio.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[galaxies: active]]></kwd>
<kwd lng="en"><![CDATA[galaxies: nuclei]]></kwd>
<kwd lng="en"><![CDATA[galaxies: Seyfert]]></kwd>
<kwd lng="en"><![CDATA[X-rays: galaxies]]></kwd>
</kwd-group>
</article-meta>
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