Searching for a Long Cosmic String Through the Gravitational Lensing Effect
Yuji Shirasaki, Ei-ichi Matsuzaki, Yoshihiko Mizumoto, Fumio Kakimoto, Syoichi Ogio, Naoki Yasuda, Masahiro Tanaka, Hideki Yahagi, Masahiro Nagashima, George Kosugi
Abstract
It has been suggested that cosmic strings produced at a phase transition in the early universe can be the origin of the extremely high energy cosmic rays (EHCR) observed by AGASA above 1020 eV. Superheavy cosmic strings with linear mass density of 1022 g/cm can be indirectly observed through the gravitational lensing effect the distant galaxies. The lensing effect by a long straight object can be characterized by a line of double galaxies or quasars with angular separation of about 5 arcsec. We have searched for aligned double objects from the archived data taken by the Subaru Prime Focus Camera (Suprime-Cam). The Suprime-Cam has a great advantage in observing the wide field of view (30x30 arcmin2) with high sensitivity (R<26 400s exposure), so it is suitable for this research. In this paper, we describe the result of simulation study for developing the method of searching the objects lensed by cosmic strings, and present the observational result obtained by this method.
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