当前位置： 文档下载 > 所有分类 > Associated absorption in radio quasars. I. C IV absorption and the growth of radio sources当前位置： 文档下载 > 所有分类 > Associated absorption in radio quasars. I. C IV absorption and the growth of radio sourcesWe assess the global properties of associated C IV 1548,1550 absorption lines measured in the spectra of radio-loud quasars drawn from a near-complete, low-frequency selected sample. The observations span restframe C IV in two redshift ranges -- 0.7
1
002 ceD 6 1v1412110/hp-ortsa:viXraAssociatedabsorptioninradioquasars.I.Civabsorptionandthe
growthofradiosources
JoanneC.Baker1,2,3,RichardW.Hunstead4,RamanaM.Athreya5,6,PeterD.Barthel7,Ericde
Silva3,
MatthewD.Lehnert8,RichardD.E.Saunders3
ABSTRACT
WeassesstheglobalpropertiesofassociatedCivλλ1548,1550absorptionlinesmea-suredinthespectraofradio-loudquasarsdrawnfromanear-complete,low-frequencyselectedsample.TheobservationsspanrestframeCivintworedshiftranges—0.7<z<1.0and1.5<z<3.0—whichweretargettedintheUVwithHST/STISandintheopticalwithground-basedtelescopes,respectively.First,wecorroboratetrendsforCivassociatedabsorptiontobefoundpreferentiallyinsteep-spectrumandlobe-dominatedquasars,implyingtheabsorbingmaterialtendstolieawayfromtheradio-jetaxis.Furthermore,we ndaclearanticorrelationbetweenCivabsorptionstrengthandtheprojectedlinearsizeofsteep-spectrumquasars,indicativeofanevolutionarysequence.Wealso ndthatheavily-absorbedquasarsaresystematicallyredder,imply-ingdustismixedinwiththeCiv-absorbinggas.Noredshiftdependencewasfoundinanyofthetrendsconsidered.Thesenewresultsshowthatradiosourcesaretriggeredingalaxieswhichareexceptionallyrichingasanddust,whichthendissipatesonatimescalecomparablewith,butlessthan,thatoftheradiosource.Thisobservationalsequence,togetherwiththelackofredshift-dependence,pointstoadirectcausallinkbetweentheeventwhichtriggeredtheradiosourceandthebuild-upofabsorbinggasanddust,whosemake-upistantalisinglysimilartotheproductsofapost-mergerstarburst.Thus,thesenewresultsprovidedirectevidencefortheclearingofabsorbingmaterialaroundquasarswithtime,aswellastheprobableassociationofstarburstactivitywiththeonsetoftheradioactivityinAGN.
Subjectheadings:Galaxies:active—quasars:general—quasars:absorptionlines
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