Intergalactic Absorption Due to Extended Gaseous Clouds at High Redshifts

Publications of the Astronomical Society of Japan

Denda, Kiyomi¹  Ikeuchi, Satoru² 

[1] Institute of Astronomy, Faculty of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181 E-mail(KD):;Department of Earth and Space Science, Faculty of Science, Osaka University, Toyonaka, Osaka 560

关键词: "Galaxies: intergalactic medium";    Opacities;    Quasars;    Ultraviolet;   

DOI  :  10.1093/pasj/48.5.639

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Inordertoexaminetheline-blanketingeffectduetogaseouscloudsathighredshifts,wehavecalculatedtheionizationstatesofgascloudsofsubgalacticmassscaleexposedtoaUVradiationfieldthatcanreproducetheionizationstatesoftheLymanlimitsystems(LLSs)alongthelineofsighttoquasarHS1700+6416.WealsoadoptedtheintegratedUVradiationfromtheobservedquasarsmodifiedbytheinterveningabsorptionduetotheLymanαforestandLLSsasanionizingspectrum.OurphotoionizationmodelscanexplaintheobservedHIcolumn-densitydistribution,theobservedCIV/HIratioandtheobservedopticaldepthsofHIandHeII.WeconcludethattheintegratedUVbackgroundmodelscanwellexplaintheionizationstatesofboththeIGMandLymanαcloudsatz∼2–3.ThegaseousmassoftheLymanαcloudsfollowsapower-lawformasdn/dMc∼Mc-δwithδ∼2–2.5inthe108–1011M⊙range.ThemajorityofthedarkbaryonprobablyconsistsoftheIGM.

【 授权许可】

Unknown