Gravitational Lensing
Gravitational Lensing
Gravitational Lensing
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Deflection angle Introduction to <strong>Gravitational</strong> <strong>Lensing</strong> Applications<br />
First Observation of Quasars<br />
0957+561 the first QSO image<br />
Adopted from : D.walsh, et.al. ‘0957+561 A, B: twin quasistellar object or gravitational lens?’,<br />
Nature Vol. 279,1979<br />
• 5.7 arcsecond separation<br />
• 1.405 redshift (87 billion light‐years)<br />
• Apparent magnitude m ~ 17<br />
Th Thanks k tto GL GL, we can now<br />
see the images of quasars!!