Gravitational Lensing
Gravitational Lensing
Gravitational Lensing
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Deflection angle Introduction to <strong>Gravitational</strong> <strong>Lensing</strong> Applications<br />
Observation of Quasars<br />
What is Quasar?<br />
• Distant object determined by high redshift<br />
of electromagnetic energy, and hence<br />
appears faint<br />
• Extremely luminous<br />
• First discovered in late 1950s by radio<br />
telescope with no corresponding visible<br />
object<br />
• Until 1979 two quasar images are<br />
observed<br />
observed…
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