2008

The Dark-Matter Fraction in the Elliptical Galaxy Lensing the Quasar PG1115+080

Pooley, D., Rappaport, S., Blackburne, J. et al.

Understand

We determine the most likely dark-matter fraction in the elliptical galaxy quadruply lensing the quasar PG1115+080 based on analyses of the X-ray fluxes of the individual images in 2000 and 2008.

Between the two epochs, the A2 image of PG1115+080 brightened relative to the other images by a factor of six in X-rays.
We argue that the A2 image had been highly demagnified in 2000 by stellar microlensing in the intervening galaxy and has recently crossed a caustic, thereby creating a new pair of micro-images and brightening in the process.
Over the same period, the A2 image has brightened by a factor of only 1.2 in the optical.

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