宇宙科学談話会

ISAS Space Science Colloquium & Space Science Seminar

ENGLISH

Multi-messenger observations of gravitational wave sources

田中 雅臣(Masaomi TANAKA
東北大学大学院 理学研究科 (TOHOKU UNIVERSITY)

On 17th August 2017, the first gravitational wave (GW) detection from a neutron star merger (GW170817) was achieved. The detection triggered electromagnetic (EM) wave observations over the entire wavelength range, which marked the beginning of a new era of "multi-messenger" astronomy. In this seminar, I briefly review multi-messenger observations of GW170817 and show results of optical and near-infrared observations of the EM counterpart. The observed properties of optical and near-infrared emission are similar to those of theoretically-expected "kilonova", which is powered by radioactive decays of r-process nuclei. I discuss implications for the origin of heavy elements in the Universe.

史上初めて検出された中性子星合体からの重力波イベント(GW170817)は広い波長域の電磁波でも観測され、本格的なマルチメッセンジャー天文学が幕を開けました。談話会では、重力波天体のマルチメッセンジャー観測を概観し、理解が進みつつある宇宙の重元素の起源についてお話しします。

Place: 2F Conf. room(1236) / 研究管理棟2階会議場(1236号室)