Properties and merger signatures of galaxies hosting LISA coalescing massive black hole binaries

Understand

The gravitational wave (GW) antenna LISA will detect the signal from coalescing massive black hole binaries (MBHBs) of $\rm 10^4\,{-}\,10^7\, M_{\odot}$, providing clues on their formation and growth along cosmic history.

• Some of these events will be localized with a precision of several to less than a deg$^2$, enabling the possible identification of their host galaxy.
• This work explores the properties of the host galaxies of LISA MBHBs below $z\,{\lesssim}\,3$.
• We generate a simulated lightcone by using the semi-analytical model $\mathrm{\texttt{L-Galaxies}}$ applied on the merger trees of the high-resolution N-body cosmological simulation $\mathrm{\texttt{Millennium-II}}$.