Microarcsecond Imaging of a Gravitationally Lensed QSO: 2237+0305

Details Microarcsecond Imaging of a Gravitationally Lensed QSO: 2237+0305 Microarcsecond Imaging of a Gravitationally Lensed QSO: 2237+0305

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9188w&link_type=abstract

HST Proposal ID #9188

Computer Science

Hst Proposal Id #9188 Agn/Quasars

Scientific paper

The microarcsecond scale structure of the central region of the gravitationally lensed quasar, 2237+0305, can be determined from its wavelength dependent lightcurve if viewed during a microlensing event. We are monitoring the QSO from the ground at regular intervals to ascertain the onset of a microlensing event. STIS spectra will then be taken and compared with the spectra taken after the event. As the microlensing event occurs, we will measure wavelength- dependent changes in the continuum, and also the variations in lines with different ionizations. Thus we will use microlensing to directly probe the structure of the source QSO on microarcsecond scales -- a factor of ten smaller than those revealed by indirect techniques such as reverberation mapping. An already approved CHANDRA Cycle 2 GO program will provide complementary X-ray data, thus greatly increasing the wavelength range over which we hope to probe the quasar's inner structure.

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