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  • 简介:1.IntroductionQuasarsarethemostluminousobjectsintheuniverseandthehighestredshiftobjectswecandirectlyobserve.Understandingtheiremissionlineshasacosmologicalimperativesincetheirspectradependonluminosity(the“Baldwineffect”;Baldwin1977,Osmeretal.1994).Oncewecandirectlymeasuretheirluminositythequasarswillgaugetheexpansionoftheuniverseatredshiftsz∧5.Atthesametime,theoriginofthechemicalelementsremainsacentralthemeacrossmuchofstellar,galactic,andextragalacticastrophysics.Quasarsprobeearlyepochsinthefor...

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