Gravitational Lensing

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Deflection angle Introduction to Gravitational Lensing Applications First Observation of Quasars 0957+561 the first QSO image Adopted from : D.walsh, et.al. ‘0957+561 A, B: twin quasistellar object or gravitational lens?’, Nature Vol. 279,1979 • 5.7 arcsecond separation • 1.405 redshift (87 billion light‐years) • Apparent magnitude m ~ 17 Th Thanks k tto GL GL, we can now see the images of quasars!!
Deflection angle Introduction to Gravitational Lensing Applications Spectra of observed object A and B. Adopted from : D.walsh, et.al. ‘0957+561 A, B: twin quasistellar object or gravitational lens?’, Nature Vol. 279,1979 • Identical relativistic jet, powerful jets of plasma emerging from massive objects • Similar redshift • Similar Visible light spectrum • Magnification of images by GL make it possible to see the images • Very unlikely to have identical quasars that close to each other. Concluding they are multiple images g from a same quasar q produced by strong gravitational lensing.
Page 1 and 2: Nelson Leung Kwok Hui Kin
Page 3 and 4: • In 1919, 1919 this effect was c
Page 5 and 6: Deflection angle Introduction to Gr
Page 7 and 8: D LS D L Deflection angle Introduct
Page 9 and 10: Einstein Ring Applications Deflecti
Page 11 and 12: Types of Lensing Applications Defle
Page 15 and 16: How cosmologists g and astrophysici
Page 17: Deflection angle Introduction to Gr
Page 29 and 30: Conclusion In recent years, gravita
Page 31: References • D.walsh, et.al. ‘0

Gravitational Lensing

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