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| The BL Lac Object PKS 0537-441: A Lens or Being Lensed? | |
| 作者姓名： | Jochen Heidt Klaus Jger Kari Nilsson Ulrich Hopp Josef W. Fried Eckhard Sutorius |
| 作者单位： | Landessternwarte，Knigstuhl，D 69117 Heidelberg，Germany，USG，Geismarlandstr. 11，D 37083 Gttingen，Germany，Tuorla Observatory，FIN 21500 Piikki，Finland，USM，Scheinerstr. 1，D 81679 München，Germany，MPIA，Knigstuhl 17，D 69117 Heidelberg，Germany，ROE，Blackford Hill，Edinburgh EH9 3HJ，United Kingdom |
| 摘 要： | 1 IntroductionTheBLLacobjectPKS 0 53 7 44 1 (z=0 .896)isoneofthemostluminoussourcesofitsclass.Itshistoricalvariabilityisapprox .Δm =5mag (Stickeletal.,1 993 ) ,whichismuchlargerthantypicallyforBLLacobjects.Duetoitsdistance ,luminosityandstrongvariability,itwasspeculated,whetheritsintrinsicpropertiesmightbemodifiedbygravitational (micro)lensingeffects (e .g .Romeroetal.,1 995,Narayan&Schneider,1 990 ) .Thishasbeentestedbysearchinge .g .forgalaxiesalongtheline of sighttotheBLLac ,howeve… |
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