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dc.creatorPoindexter, Shawn
dc.creatorKochanek, Christopher S.
dc.identifier.citationShawn Poindexter and Christopher S. Kochanek, "The Transverse Peculiar Velocity of the Q2237+0305 Lens Galaxy and the Mean Mass of its Stars," The Astrophysical Journal 712, no. 1 (2010), doi:10.1088/0004-637X/712/1/658en_US
dc.description.abstractUsing 11 years of OGLE V-band photometry of Q2237+0305, we measure the transverse velocity of the lens galaxy and the mean mass of its stars. We can do so because, for the first time, we fully include the random motions of the stars in the lens galaxy in the analysis of the light curves. In doing so, we are also able to correctly account for Earth's parallax motion and the rotation of the lens galaxy, further reducing systematic errors. We measure a lower limit on the transverse speed of the lens galaxy, v_t > 338 km s^-1 (68% confidence) and find a preferred direction to the east. The mean stellar mass estimate, including a well-defined velocity prior, is 0.12 ≤ (M/Msun ) ≤ 1.94 at 68% confidence, with a median of 0.52 Msun. We also show for the first time that analyzing subsets of a microlensing light curve, in this case the first and second halves of the OGLE V-band light curve, gives mutually consistent physical results.en_US
dc.publisherAmerican Astronomical Societyen_US
dc.subjectgalaxies: kinematics and dynamicsen_US
dc.subjectgravitational lensing: microen_US
dc.subjectmethods: numericalen_US
dc.subjectquasars: individual (Q2237+0305)en_US
dc.titleThe Transverse Peculiar Velocity of the Q2237+0305 Lens Galaxy and the Mean Mass of its Starsen_US

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