<?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>S0185-11012022000100133</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2022.58.01.11</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Temperature Discrepancy with Photoionization Models of the Narrow-Line Region]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Binette]]></surname>
<given-names><![CDATA[Luc]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villar Martín]]></surname>
<given-names><![CDATA[Montserrat]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Magris C.]]></surname>
<given-names><![CDATA[Gladis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Paredes]]></surname>
<given-names><![CDATA[Mariela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alarie]]></surname>
<given-names><![CDATA[Alexandre]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez Ardila]]></surname>
<given-names><![CDATA[Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villicaña-Pedraza]]></surname>
<given-names><![CDATA[Ilhuiyolitzin]]></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[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Astrobiología Departamento de Astrofísica ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro de Investigaciones de Astronomía  ]]></institution>
<addr-line><![CDATA[Mérida ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Korea Astronomy and Space Science Institute  ]]></institution>
<addr-line><![CDATA[Daejeon ]]></addr-line>
<country>South Korea</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Université Laval Département de physique, de génie physique et d'optique ]]></institution>
<addr-line><![CDATA[Québec ]]></addr-line>
<country>Canada</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Laboratório Nacional de Astrofísica  ]]></institution>
<addr-line><![CDATA[Itajubá ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,New Mexico State University DACC Science Department ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<volume>58</volume>
<numero>1</numero>
<fpage>133</fpage>
<lpage>153</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012022000100133&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012022000100133&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012022000100133&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Using published work on the narrow-line region of active galactic nuclei, a comparison is carried out among the [O III] &#955;4363Å/&#955;5007Å (ROIII) ratio observed in quasars, Seyfert 2's and the spatially resolved ENLR plasma. Using the weak [Ar IV] &#955;4711Å/&#955;4740Å doublet ratio observed by Koski (1978) among Seyfert 2's, we find evidence of a narrow-line region (NLR) populated by low density emission clouds (&#8818; 104 cm-3). After considering calculations of the [Ar IV] and [O III] ratios that assume a power law distribution of plasma densities, no evidence of collisional deexcitation is found. The plasma temperature inferred is 13 500 °K, which is problematic to reproduce with standard photoionization calculations. The simplest interpretation for the near coincidence of the ROIII ratios among the ENLR and Seyfert 2 measurements (ROIII &#8771; 0:017) is that the low density regime applies to both plasmas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Utilizando trabajos publicados sobre la región de líneas angostas de los núcleos galácticos activos, se compara el [O III] &#955;4363Å/&#955;5007Å (ROIII) observado en cuásares, Seyfert 2 y en el plasma espacialmente resuelto de la ENLR. Mediante el débil doblete de [Ar IV] &#955;4711Å/&#955;4740Å observado por Koski encontramos evidencias de una región de líneas angostas (NLR) poblada por nubes de emisión de baja densidad (&#8818; 104 cm-3). Tras considerar los cálculos de las relaciones [Ar IV] y [O III] que asumen una distribución de ley de potencia de las densidades del plasma, no se encuentra evidencia de desexcitación colisional. La temperatura del plasma que se infiere es de 13 500 °K, la cual es difícil de reproducir con los cálculos estándar de fotoionización. La interpretación más sencilla de la casi coincidencia de los cocientes de ROIII medidos en la ENLR y las Seyfert 2 (ROIII &#8771; 0:017) sería que el régimen de baja densidad se aplica a ambos plasmas.]]></p></abstract>
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<kwd lng="en"><![CDATA[extinction]]></kwd>
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