<?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>S0185-11012024000200317</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2024.60.02.09</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Instrumental broadening of the SPOL spectropolarimeter at the University of Arizona]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Amador-Portes]]></surname>
<given-names><![CDATA[Alfredo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chavushyan]]></surname>
<given-names><![CDATA[Vahram]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Patiño-Alvarez]]></surname>
<given-names><![CDATA[Victor M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Astrofísica, Óptica y Electrónica  ]]></institution>
<addr-line><![CDATA[Tonantzintla Puebla]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Max-Planck-Institut für Radioastronomie  ]]></institution>
<addr-line><![CDATA[Bonn ]]></addr-line>
<country>Germany</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>317</fpage>
<lpage>322</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012024000200317&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012024000200317&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012024000200317&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The Ground-based Observational Support of the Fermi Gamma-ray Space Telescope is conducted by the University of Arizona using the 2.3m Bok and 1.54m Kuiper telescopes operated by the Steward Observatory (SO). This program monitors blazar sources with spectroscopic observations. Yet, the instrumental broadenings for the di&#64256;erent slit widths used in the spectra are unavailable (the widths range from    2  .  "0 to 1   2  .  "7). Using quasi-simultaneous spectroscopic observations of the blazar 3C 273 between the SO, Observatorio Astrofísico Guillermo Haro, and Observatorio Astronómico Nacional San Pedro Mártir, we can provide an estimation of the instrumental profile for two of the slit widths. Since the instrumental broadening and the slit width are directly proportional, we are able to estimate the instrumental broadening for all six slit widths used at the SO.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El soporte de observaciones terrestres del telescopio espacial Fermi de rayos gamma, se realiza por la Universidad de Arizona con los telescopios Bok de 2.3m y Kuiper de 1.54m, operado por el Observatorio Steward (SO). Este programa monitorea fuentes blazares con observaciones espectroscópicas. Sin embargo, la información del perfil instrumental para diferentes anchos de rendija usados en los espectros ópticos no está disponible (los anchos van desde    2  .  "0 a 1   2  .  "7). Por ello, utilizando observaciones de espectros cuasi-simultáneos del blazar 3C 273 entre el SO, el Observatorio Astrofísico Guillermo Haro y el Observatorio Astronómico Nacional San Pedro Mártir, determinamos el perfil instrumental para dos anchos de rendija. Ya que el ancho instrumental y el ancho de rendija son directamente proporcionales, fue posible estimar el perfil instrumental para los seis anchos de rendija usados en el SO.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[galaxies: active]]></kwd>
<kwd lng="en"><![CDATA[instrumentation: spectrographs]]></kwd>
<kwd lng="en"><![CDATA[methods: observational]]></kwd>
<kwd lng="en"><![CDATA[quasars: individual: 3C 273]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Aharonian]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Akhperjanian]]></surname>
<given-names><![CDATA[A. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Bazer-Bachi]]></surname>
<given-names><![CDATA[A. R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[An Exceptional Very High Energy Gamma-Ray Flare of PKS 2155-304]]></article-title>
<source><![CDATA[ApJ]]></source>
<year>2007</year>
<volume>664</volume>
<page-range>71</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Amaya-Almazán]]></surname>
<given-names><![CDATA[R. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Chavushyan]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Patiño-Álvarez]]></surname>
<given-names><![CDATA[V. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Multiwavelength Analysis and the Difference in the Behavior of the Spectral Features during the 2010 and 2014 Flaring Periods of the Blazar 3C 454.3]]></article-title>
<source><![CDATA[ApJ]]></source>
<year>2021</year>
<volume>906</volume>
<page-range>5</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Amaya-Almazán]]></surname>
<given-names><![CDATA[R. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Chavushyan]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Patiño-Álvarez]]></surname>
<given-names><![CDATA[V. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Multiwavelength Analysis and the C IV &#955;1549 Å Emission Line Behavior From 2008 to 2020 of FSRQ B2 1633+382]]></article-title>
<source><![CDATA[ApJ]]></source>
<year>2022</year>
<volume>929</volume>
<page-range>14</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Blandford]]></surname>
<given-names><![CDATA[R. D.]]></given-names>
</name>
<name>
<surname><![CDATA[McKee]]></surname>
<given-names><![CDATA[C. F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Reverberation mapping of the emission line regions of Seyfert galaxies and quasars]]></article-title>
<source><![CDATA[ApJ]]></source>
<year>1982</year>
<volume>255</volume>
<page-range>419</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bonning]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Urry]]></surname>
<given-names><![CDATA[C. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Bailyn]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[SMARTS OPTICAL AND INFRARED MONITORING OF 12 GAMMA-RAY BRIGHT BLAZARS]]></article-title>
<source><![CDATA[ApJ]]></source>
<year>2012</year>
<volume>756</volume>
<page-range>13</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chavushyan]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Patiño-Álvarez]]></surname>
<given-names><![CDATA[V. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Amaya-Almazán]]></surname>
<given-names><![CDATA[R. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Carrasco]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Flare-like Variability of the Mg II &#955;2798 Å Emission Line and UV Fe II Band in the Blazar CTA 102]]></article-title>
<source><![CDATA[ApJ]]></source>
<year>2020</year>
<volume>891</volume>
<page-range>68</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fan]]></surname>
<given-names><![CDATA[J. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Tao]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Liu]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Optical Photometric Monitoring for 3C 66A during 1996-2009 and Its Periodicity Analysis]]></article-title>
<source><![CDATA[AJ]]></source>
<year>2018</year>
<volume>155</volume>
<page-range>90</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fernandes]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Patiño-Álvarez]]></surname>
<given-names><![CDATA[V. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Chavushyan]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Multiwavelength analysis of the variability of the blazar 3C 273]]></article-title>
<source><![CDATA[MNRAS]]></source>
<year>2020</year>
<volume>497</volume>
<page-range>2066</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Greene]]></surname>
<given-names><![CDATA[J. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Ho]]></surname>
<given-names><![CDATA[L. C.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estimating Black Hole Masses in Active Galaxies Using the H&#945; Emission Line]]></article-title>
<source><![CDATA[ApJ]]></source>
<year>2005</year>
<volume>630</volume>
<page-range>122</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gupta]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Multi-Wavelength Intra-Day Variability and Quasi-Periodic Oscillation in Blazars]]></article-title>
<source><![CDATA[Galaxies]]></source>
<year>2018</year>
<volume>6</volume>
<page-range>1</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gurwell]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Peck]]></surname>
<given-names><![CDATA[A. B.]]></given-names>
</name>
<name>
<surname><![CDATA[Hostler]]></surname>
<given-names><![CDATA[S. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Farrah]]></surname>
<given-names><![CDATA[M. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Katz]]></surname>
<given-names><![CDATA[C. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Baker]]></surname>
<given-names><![CDATA[A. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Glenn]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Harris]]></surname>
<given-names><![CDATA[A. I.]]></given-names>
</name>
<name>
<surname><![CDATA[Mangum]]></surname>
<given-names><![CDATA[J. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Yun]]></surname>
<given-names><![CDATA[M. S.]]></given-names>
</name>
</person-group>
<source><![CDATA[ASPC 375, From Z-Machines to ALMA: (Sub)Millimeter Spectroscopy of Galaxies]]></source>
<year>2007</year>
<page-range>234</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kong]]></surname>
<given-names><![CDATA[M.-Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[X.-B.]]></given-names>
</name>
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estimating Black Hole Masses of AGNs using Ultraviolet Emission Line Properties]]></article-title>
<source><![CDATA[ChJAA]]></source>
<year>2006</year>
<volume>6</volume>
<page-range>396</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[León-Tavares]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Chavushyan]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Patiño-Álvarez]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[FLARE-LIKE VARIABILITY OF THE Mg II &#955;2800 EMISSION LINE IN THE &#947;-RAY BLAZAR 3C 454.3]]></article-title>
<source><![CDATA[ApJ]]></source>
<year>2013</year>
<volume>763</volume>
<page-range>36</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Nalewajko]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Gupta]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Liao]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Long-term optical spectroscopic variations in blazar 3C 454.3]]></article-title>
<source><![CDATA[A&amp;A]]></source>
<year>2019</year>
<volume>631</volume>
<page-range>4</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pandey]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Rakshit]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Woo]]></surname>
<given-names><![CDATA[J.-H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Spectroscopic reverberation mapping of Quasar PKS 0736 + 017: broad-line region and black-hole mass]]></article-title>
<source><![CDATA[MNRAS]]></source>
<year>2022</year>
<volume>516</volume>
<page-range>2671</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Patiño Álvarez]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Torrealba]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Chavushyan]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Baldwin Effect and Additional BLR Component in AGN with Superluminal Jets]]></article-title>
<source><![CDATA[FrASS]]></source>
<year>2016</year>
<volume>3</volume>
<page-range>19</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peterson]]></surname>
<given-names><![CDATA[B. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[REVERBERATION MAPPING OF ACTIVE GALACTIC NUCLEI]]></article-title>
<source><![CDATA[PASP]]></source>
<year>1993</year>
<volume>105</volume>
<page-range>247</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rakshit]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Broad line region and black hole mass of PKS 1510-089 from spectroscopic reverberation mapping]]></article-title>
<source><![CDATA[A&amp;A]]></source>
<year>2020</year>
<volume>642</volume>
<page-range>59</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Richards]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Max-Moerbeck]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Pavlidou]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
</person-group>
<source><![CDATA[Radio Variability Studies of Gamma-Ray Blazars with the OVRO 40 m Telescope]]></source>
<year>2011</year>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Schroeder]]></surname>
<given-names><![CDATA[D. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Astrophysics]]></source>
<year>1974</year>
<page-range>463</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Shapovalova]]></surname>
<given-names><![CDATA[A. I.]]></given-names>
</name>
<name>
<surname><![CDATA[Burenkov]]></surname>
<given-names><![CDATA[A. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Carrasco]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Intermediate resolution H&#946; spectroscopy and photometric monitoring of 3C 390.3]]></article-title>
<source><![CDATA[A&amp;A]]></source>
<year>2001</year>
<volume>376</volume>
<page-range>775</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Shaw]]></surname>
<given-names><![CDATA[M. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Romani]]></surname>
<given-names><![CDATA[R. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Cotter]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[SPECTROSCOPY OF BROAD-LINE BLAZARS FROM 1LAC]]></article-title>
<source><![CDATA[ApJ]]></source>
<year>2012</year>
<volume>748</volume>
<page-range>49</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[P. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Montiel]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Rightley]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<source><![CDATA[Coordinated Fermi/Optical Monitoring of Blazars and the Great 2009 September Gamma-ray Flare of 3C 454.3]]></source>
<year>2009</year>
</nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stroh]]></surname>
<given-names><![CDATA[M. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Falcone]]></surname>
<given-names><![CDATA[A. D.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[SWIFT X-RAY TELESCOPE MONITORING OF FERMI-LAT GAMMA-RAY SOURCES OF INTEREST]]></article-title>
<source><![CDATA[ApJS]]></source>
<year>2013</year>
<volume>207</volume>
<page-range>28</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Urry]]></surname>
<given-names><![CDATA[C. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Padovani]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[UNIFIED SCHEMES FOR RADIO-LOUD ACTIVE GALACTIC NUCLEI]]></article-title>
<source><![CDATA[PASP]]></source>
<year>1995</year>
<volume>107</volume>
<page-range>803</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vestergaard]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Peterson]]></surname>
<given-names><![CDATA[B. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships]]></article-title>
<source><![CDATA[ApJ]]></source>
<year>2006</year>
<volume>641</volume>
<page-range>689</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Yuan]]></surname>
<given-names><![CDATA[Y. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Zheng]]></surname>
<given-names><![CDATA[Y. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Fan]]></surname>
<given-names><![CDATA[J. H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The Spectrum Variabilities of FSRQ 3C 273]]></article-title>
<source><![CDATA[PASP]]></source>
<year>2022</year>
<volume>134</volume>
<page-range>044102</page-range></nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[Z.-X.]]></given-names>
</name>
<name>
<surname><![CDATA[Du]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[P. S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Kinematics of the Broad-line Region of 3C 273 from a 10 yr Reverberation Mapping Campaign]]></article-title>
<source><![CDATA[ApJ]]></source>
<year>2019</year>
<volume>876</volume>
<page-range>49</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
