<?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>S0185-11012019000100105</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Selection effects and structural symmetries in the orientation based unified scheme]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Onuchukwu]]></surname>
<given-names><![CDATA[C. C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ubachukwu]]></surname>
<given-names><![CDATA[A. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Chukwuemeka Odumegwu Ojukwu University Department of Industrial Physics ]]></institution>
<addr-line><![CDATA[ Anambra State]]></addr-line>
<country>Nigeria</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Nigeria Nsukka Faculty of Physical Sciences, Carver Building Department of Physics and Astronomy]]></institution>
<addr-line><![CDATA[ Enugu State]]></addr-line>
<country>Nigeria</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>55</volume>
<numero>1</numero>
<fpage>105</fpage>
<lpage>116</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012019000100105&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012019000100105&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012019000100105&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT: Using the projected linear size, (D) as an orientation parameter, the arm-length ratio, (Q) and the lobe-luminosity ratio, (R) as asymmetry parameters, we test the FR-II galaxies (Gs) and radio-loud quasar (Qs) unification scheme. Using the median values of our binned sample, our results, generally indicate that the D of the radio sources are smaller at higher redshifts z and at larger Q values, with the D of Qs smaller than those of Gs across all Q, z and R bins. Also, the D of Gs appear smaller for lower values of Q, if R &#8804; 1.0 but become larger at higher values of Q if R &gt; 1.0. For Qs, the D decreases with increasing Q, R and z. These results imply that the beaming e&#64256;ect is more important in Qs than in Gs. The D &#8722; R regression analyses for di&#64256;erent Q and z subsamples suggest the importance of factors other than beaming and orientation in the interpretation of the evolution of these radio sources.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN: Con el tamaño lineal proyectado (D) como parámetro para la orientación, el cociente de las longitudes de los brazos (Q) y el cociente de las luminosides de los lóbulos (R) como parámetros de asimetría, ponemos a prueba el esquema unificado para galaxias FR-II (GS) y cuasares radio-intensos (Qs). Usando las medianas para nuestras muestras agrupadas, encontramos que en general las D de las radio fuentes son menores para corrimientos al rojo z y valores Q mayores, siendo las D de los Qs menores que las de las Gs para todos los grupos de Q, z y R. Las D de las Gs son menores para valores menores de Q si R &#8804; 1.0 pero aumentan para valores mayores de Q si R &gt; 1.0. Para los Qs, las D disminuyen al aumentar Q, R y z. Estos resultados implican que el efecto de colimación es más importante para las Qs que para las Gs. Las regresiones D &#8722; R para distintas submuestras de Q y z sugieren la importancia de otros efectos para interpretar la evolución de estos objetos, además de la colimación y la orientación.]]></p></abstract>
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