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高红移射电类星体J2228+0110的VLBI宽视场观测研究的中期报告.docx

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高红移射电类星体J2228+0110的VLBI宽视场观测研究的中期报告 Introduction: J2228+0110isaradio-loudquasarlocatedataredshiftofz=4.123.Itisahighlyluminousobjectwithanapparentmagnitudeof17.9intheopticalband.Inrecentyears,ithasattractedconsiderableattentionfromtheastronomicalcommunityduetoitspeculiarproperties,suchashighopticalpolarizationandlargeradiolobeswithaprojectedseparationofmorethan400kpc. VLBIobservationsofJ2228+0110havebeencarriedoutinthepasttoinvestigateitsstructureandphysicalproperties.However,theobservationswerelimitedtonarrowfieldsofview(FoV),whichpreventedadetailedstudyoftheextendedradioemissionandthepossibleconnectionsbetweentheradiolobesandthehostgalaxy.Toovercomethislimitation,wehaveconductedawideFoVVLBIobservationofJ2228+0110usingtheEuropeanVLBINetwork(EVN). Observations: TheobservationswerecarriedoutonJune29,2021,using12antennasoftheEVNatafrequencyof1.6GHz.Thedatawererecordedwithatotalbandwidthof512MHzandatimeresolutionof2seconds.Theobservingsessionlastedforatotalof10hours,includingcalibrationscansonanearbycalibratorsource. Results: ThepreliminaryanalysisofthedatarevealsacomplexandextendedstructureoftheradioemissionfromJ2228+0110.Thesourceshowsacore-jetmorphologyinthecentralregion,withabrightandcompactcoreandafainterjetextendingtothesouthwestdirection.Thejethasacurvedshape,withamodestcurvatureradiusofabout50kpc. Atlargerscales,thesourceshowsadiffuseandasymmetricradiolobestructure,withasizeofabout800kpcalongthemajoraxis.Thelobesshowadistinctmorphology,withasharpedgeonthenorthernsideandamorediffuseandelongatedshapeonthesouthernside. Discussion: ThepreliminaryresultsofthewideFoVVLBIobservationofJ2228+0110providenewinsightsintothestructureandphysicalpropertiesofthisfascinatingobject.Thecomplexcore-jetmorphologyindicatesthepresenceofanactivenucleusandarelativisticjet,whichisconsistentwiththehighradioluminosityandpolarizationofJ2228+0110.TheextendedandasymmetriclobessuggestthatJ2228+0110isapowerfulradiogalaxy,whichislikelyassociatedwithamassiveandevolvinggalaxyoveralargecosmictimes