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Chandra and XMM-Newton Results on the Hubble Constant from Gravitational Lensing

Garmire, G. P.; Dai, X.; Chartas, G.

We report the first detection of time-delayed flares in single X-ray observations of the gravitationally lensed quasar PG 1115+080 performed with the Chandra and XMM observatories. By combining our observed short time-delay between images A1 and A2 of PG 1115+080 of Δt_A1A2 = 0.149 ±0.006 days with recent constraints on the mass fraction…