Color Variations in the Gravitational Lens Q2237 + 0305

Details Color Variations in the Gravitational Lens Q2237 + 0305 Color Variations in the Gravitational Lens Q2237 + 0305

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002arep...46..435s&link_type=abstract

Astronomy Reports, Volume 46, Issue 6, June 2002, pp. 435-442

Astronomy and Astrophysics

Astronomy

Scientific paper

We show that the color index of a quasar image and the second time derivative of the intensity should be correlated if variations of the amplification coefficient for gravitational microlensing are smooth. We estimate an upper limit for the size of the emitting region of the quasar associated with the gravitational lens Q2237+0305 based on simultaneous observations made in 1997 by the OGLE group in the V band and at the Ma danak Observatoryin the R band.

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