Wish us luck! ----- Submission 1 (Fri May 13 17:16:38 GMT 2005) ----- We have measured our positions on a Magellan 6.5-m image referred to the USNO-B coordinate system. Our coordinates are good to +/- 0.2 arcsec. The coordinates WE calculate for GSC stars in the field agree with the GSC coordinates to better than 1.0 arcsec. We therefore believe we are safely within the boundaries of NIC2. APT is quite nice! Assigned ID: 223 ----- Submission 1 (Fri Jan 21 16:25:38 GMT 2005) ----- Dark matter and the missing images of cx2201-3201 The galaxy lensing the z=3.9 quasar cx2201-3201 is a bulgeless edge-on spiral. Models for the disk that contain more than 20% of the mass predict four images, but only two are seen in ground-based images. We request 3 orbits to obtain high resolution optical and infrared images. If the missing images are indeed absent, more than 80% of the mass inside the Einstein radius must be in an unseen spherical component.
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