Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-04-07
Mon.Not.Roy.Astron.Soc. 352 (2004) 125-130
Astronomy and Astrophysics
Astrophysics
v2: journal reference updated
Scientific paper
10.1111/j.1365-2966.2004.07902.x
A parallax method to determine transverse velocity in a gravitationally lensed system is described. Using the annual motion of the Earth around the Sun allows us to probe the local structure of the magnification map that, under certain assumptions, can be used to infer the effective transverse velocity. The method is applied to OGLE data for QSO2237+0305 and the velocity value is estimated to be about (15 +/- 10) km/s if attributed to the lensing galaxy or about (420 +/- 300) km/s if attributed to the quasar. We find this estimate unreasonably small and conclude that we have not measured a parallax effect. We give a short list of properties that a system should possess to allow a successful implementation of this method.
Lewis Geraint F.
Tuntsov Artem V.
Walker Mark A.
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