Determination of the transverse velocity of Q2237+0305

Details Determination of the transverse velocity of Q2237+0305 Determination of the transverse velocity of Q2237+0305

1999-09-21

arxiv.org/abs/astro-ph/9909358v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. To appear in "Gravitational Lensing: Recent Progress and Future Goals", ASP conference series, eds Brainer

Scientific paper

The largest systematic uncertainty present in the analysis of gravitationally microlensed quasar light curves is that of the galactic transverse velocity. We describe a method for determining the transverse velocity as well as its application to published monitoring data of Q2237+0305 (Irwin et al. 1989; Corrigan et al. 1991; Ostensen et al 1995). We find that while this data displays strong evidence for microlensing, it limits the transverse velocity to be < 500 km/sec (for microlens masses of 0.5 solar masses). In addition, by combining these results with a new method for modelling the microlensing contribution of stellar proper motions, we find that the masses of microlenses in Q2237+0305 are consistent with those of low mass stars.

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