Detection of the Gravitational Lens Magnifying a Type Ia Supernova
Detection of the Gravitational Lens Magnifying a Type Ia Supernova
Objects of known brightness, like type Ia supernovae (SNIa), can be used to measure distances. If a massive object warps spacetime to form multiple images of a background SNIa, a direct test of cosmic expansion is also possible. However, these lensing events must first be distinguished from other rare phenomena. …