An X-Ray Microlensing Test of the Au-Scale Central Structure of the Quadruple Quasar 2237+0305

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Chandra Proposal Id #05700320

Scientific paper

We propose Chandra observation of the gravitationally lensed quasar Q2237+0305 (Einstein Cross) during a microlensing event. We will monitor the four images of the QSO from the ground regularly to ascertain the onset of a microlensing event. As the microlensing event occurs, we will measure the variations of X-ray intensity and spectra with Chandra and compare with those taken after the event. Since only a small region of the QSO accretion disk is strongly magnified during a microlensing event, we will be able to limit the size of X-ray emitting regions of the QSO and thus the mass which is contained on scales of several AUs. If observed simultaneously with ground-based telescopes and with HST, furthermore, we will also be able to probe multi-wavelength emission properties of QSOs.

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