Chandra Observations and Optical Identification of Hard X-Ray Sources Discovered with ASCA

Watanabe Shin; Akiyama Masayuki; Ueda Yoshihiro; Ohta Kouji; Mushotzky Richard; Takahashi Tadayuki; Yamada Toru

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Chandra Observations and Optical Identification of Hard X-Ray Sources Discovered with ASCA

机译：Chandra观测和ASCA发现的硬X射线源的光学鉴定

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WepresentthefirstresultsofChandraandopticalfollow-upobservationsofhardX-raysourcesdetectedintheASCAMediumSensitivitySurvey(AMSS).Opticalidentificationsweremadeforfiveobjects.Threeofthemshoweitherweakorabsentopticalnarrowemissionlines,andareatlowredshift$$langlez anglesim0.06$$.Oneofthemisabroadlineobjectat$$z=0.910$$andoneisa$$z=0.460$$objectwithonlynarrowlines.Allofthenarrow-lineobjectsshowstrongevidenceofabsorptionintheirX-rayspectra.TheirlineratiosareconsistentwithaSeyfertII/LINERidentification,asarethelinewidths.Thethreelow-redshiftobjectshavethecolorsofnormalgalaxies,andapparentlythelightisdominatedbystars.ThiscouldbeduetoextinctionoftheunderlyingnuclearcontinuumbythesamematterthatabsorbsX-raysand/orduetodilutionofthecentralsourcebystarlight.TheseresultssuggestthatX-raysourcesthatappearasa€?normala€?galaxiesinopticalandnear-IRbandssignificantlycontributetothehardX-raybackground.Thispopulationofobjectshasahighspacedensity,andprobablydominatestheentirepopulationofactivegalaxies.

机译：WepresentthefirstresultsofChandraandopticalfollow-upobservationsofhardX-raysourcesdetectedintheASCAMediumSensitivitySurvey（AMSS）.Opticalidentificationsweremadeforfiveobjects.Threeofthemshoweitherweakorabsentopticalnarrowemissionlines，andareatlowredshift $$ langlez anglesim0.06 $$。Oneofthemisabroadlineobjectat $$ Z = 0.910 $$ andoneisa $$ Z = 0.460 $$ objectwithonlynarrowlines.Allofthenarrow-lineobjectsshowstrongevidenceofabsorptionintheirX-rayspectra.TheirlineratiosareconsistentwithaSeyfertII / LINERidentification ，asarethelinewidths.Thethreelow-redshiftobjectshavethecolorsofnormalgalaxies，andapparentlythelightisdominatedbystars.ThiscouldbeduetoextinctionoftheunderlyingnuclearcontinuumbythesamematterthatabsorbsX-raysand / orduetodilutionofthecentralsourcebystarlight.TheseresultssuggestthatX-raysourcesthatappearasa€？normala€？galaxiesinopticalandnear-IRbandssignificantlycontributetothehardX-raybackground.Thispopulationofobjectshasahighspacedensity，andprobablydominatestheentirepopulationofactivegalaxies。

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《PASJ: Publications of the Astronomical Society of Japan》 |2002年第5期|共页
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Watanabe Shin; Akiyama Masayuki; Ueda Yoshihiro; Ohta Kouji; Mushotzky Richard; Takahashi Tadayuki; Yamada Toru;
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Chandra Observations and Optical Identification of Hard X-Ray Sources Discovered with ASCA

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