Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-08-25
Astrophys.J.697:1892-1900,2009
Astronomy and Astrophysics
Astrophysics
7 pages, 9 figures, submitted to ApJ
Scientific paper
10.1088/0004-637X/697/2/1892
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. The most likely ratio of smooth material (dark matter) to clumpy material (stars) in the lensing galaxy to explain the observations is ~90% of the matter in a smooth dark-matter component and ~10% in stars.
Blackburne J.
Pooley David
Rappaport Saul
Schechter Paul L.
Schwab Josiah
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