Journal article

A measurement of the transverse velocity of Q2237 0305

JSB Wyithe, RL Webster, EL Turner

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | BLACKWELL SCIENCE LTD | Published : 1999

Abstract

Determination of microlensing parameters in the gravitationally lensed quasar Q2237+0305 from the statistics of high-magnification events will require monitoring for more than 100 years (Wambsganss, Paczynski & Schneider). However, we show that the effective transverse velocity of the lensing galaxy can be determined on a more realistic time-scale through consideration of the distribution of light-curve derivatives. The 10 years of existing monitoring data for Q2237+0305 are analysed. These data display strong evidence for microlensing that is not associated with a high-magnification event. An upper limit of υt < 500kms-1 is obtained for the galactic transverse velocity, which is smaller tha..

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