Deci hertz Laser Interferometer can determine the position of the Coalescing Binary Neutron Stars within an arc minute a week before the final merging event to Black Hole

摘要

It may be possible to construct a laser interferometer gravitational waveantenna in space with $h_{rms}\sim 10^{-23}$ at $ f\sim 0.1{\rm Hz}$ in $\sim2020$. This deci hertz antenna may be called DECIGO/BBO,which stand for DECihertz Interferometer Gravitational wave Observatory and Big Bang Observer,respectively. The analysis of 1-10 years observational data of the coalescingbinary neutron stars or black holes at the distance of $\sim$ 300Mpc will giveus the spatial position within $\sim$ an arc minute and the time of thecoalescence within $\sim 0.1$ sec beforehand. With the knowledge of theaccurate position and the time of final merging event, the follow upsimultaneous observation using high frequency ($ f\sim 100{\rm Hz}$)gravitational wave antennae as well as electro-magnetic wave antennae from theradio frequency to the ultra high energy gamma ray will reveal the physics inthe enigmatic event of the coalescence and the formation of the black hole.