Detectability of gravitational microlensing in the quasar QSO2237 + 0305

Details Detectability of gravitational microlensing in the quasar QSO2237 + 0305 Detectability of gravitational microlensing in the quasar QSO2237 + 0305

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.338..745k&link_type=abstract

Nature (ISSN 0028-0836), vol. 338, April 27, 1989, p. 745, 746. Research supported by DFG.

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30

Gravitational Lenses, Light Curve, Quasars, Abundance, Red Shift

Scientific paper

Recent observations show that the quasar QSO2237 + 0305. which lies almost exactly behind the center of a nearby bright galaxy, is split into four images with very similar spectra, strongly suggesting gravitational lensing by the foreground galaxy. It is shown here that compact objects within the galaxy lying near the line of sight can cause transient microlensing effects. Rapid changes due to transverse motions of quasar, galaxy, and observer turn out to be more likely in QSO2237 + 0305 than in any other system. The time delays between the four macroimages are about a day or less, so intrinsic variations should show up 'simultaneously' in all images and a change in observed luminosity ratios would be direct proof of microlensing.

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