Gravitational Lensing

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Deflection angle Introduction to Gravitational Lensing Applications Caustic Curve • Magnification increases when source is approaching the h caustic i li line (red ( d li line) ) • Microlensing in multiple lens system have caustic curve, where the magnification is very high. • When the source is inside the caustic contour, more image will produce
Deflection angle Introduction to Gravitational Lensing Applications Discovery y of Exoplanets p Light curve of OGLE 2003‐BLG‐235/MOA 2003‐BLG‐53 Adopted from: www.nd.edu/~bennett/ • Microlensing is the only method of dt detecting ti planets l t in i the th other th galaxies l i until now • Without a planet, planet we can only observe hill hill‐ shaped curve due to the star (single‐lens system) • A planet p with star pproduces two spikes p on the curve (two‐lens system) • Graph analysis shows the existence of small mass planet
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 19: 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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