Detection of the gravitational lens magnifying a type Ia supernova.
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明るすぎる超新星、手前に虫めがねがあった! -重力レンズを生み出す銀河をついに発見-. 京都大学プレスリリース. 2014-04-25.
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. Recently, a supernova was found to shine much brighter than normal for its distance, which resulted in a debate: Was it a new type of superluminous supernova or a normal SNIa magnified by a hidden gravitational lens? Here, we report that a spectrum obtained after the supernova faded away shows the presence of a foreground galaxy-the first found to strongly magnify a SNIa. We discuss how more lensed SNIa can be found than previously predicted.
Science 344(6182), 396-399, 2014-04-25
American Association for the Advancement of Science