Time-Delays and Mass Models for the Quadruple Lens RXJ1131-1231

Details Time-Delays and Mass Models for the Quadruple Lens RXJ1131-1231 Time-Delays and Mass Models for the Quadruple Lens RXJ1131-1231

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2107m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #21.07; Bulletin of the American Astronomical Society, V

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We have measured the three time delays for the quadruple gravitational lens RXJ1131 using three seasons of monitoring data. The short delays between cusp images are A-B = 11.65 +/0.46 days and A-C = 8.42 +/0.92 days, and the long A-D delay for the counter image is -85 +/2 days. The short delays are difficult to explain using standard isothermal halo models of the lensing potential, which instead prefer A-B and A-C delays of 1 day for reasonable values of the Hubble constant. Matching the cusp delays is possible by adding a significant ( 5x10^10 solar) amount of matter nearly coincident ( 0.05" South-East) with the A image. Adding such a satellite also helps improve the quasar and lens astrometry of the model, reduces the velocity dispersion of the main lens and shifts it closer to the Fundamental Plane. This is suggestive of a satellite galaxy to the primary lens, but its expected luminosity and proximity to both image A and the system's bright Einstein ring make visual identification impossible even with the existing HST data. We also find evidence for significant structure along the line of sight toward the lens. Archival Chandra observations show two nearby regions of extended X-ray emission, each with bolometric X-ray luminosities of 2-3x10^43 ergs/s. The brighter region is located approximately 153" from the lens and centered on a z=0.1 foreground cD galaxy, and the fainter and presumably more distant region is 4-5 times closer (in angular separation) to the lens and likely corresponds to the weaker of two galaxy red sequences (which includes the lens galaxy) previously detected at optical wavelengths.

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