%0 Generic %1 lops2022galaxy %A Lops, Gaia %A Izquierdo-Villalba, David %A Colpi, Monica %A Bonoli, Silvia %A Sesana, Alberto %A Mangiagli, Alberto %D 2022 %K library %T Galaxy fields of LISA massive black hole mergers in a simulated Universe %U http://arxiv.org/abs/2207.10683 %X LISA will extend the search for gravitational waves (GWs) at $0.1\,-\,100$ mHz where loud signals from coalescing binary black holes of $ 10^4 \,-\,10^7\,M_ødot$ are expected. Depending on their mass and luminosity distance, the uncertainty in the LISA sky-localization decreases from hundreds of deg$^2$ during the inspiral phase to fractions of a deg$^2$ after the merger. By using the semi-analytical model L-Galaxies applied to the Millennium-I merger trees, we generate a simulated Universe to identify the hosts of $z\,łeq\,3$ coalescing binaries with total mass of $3\,\times\,10^5$, $3\,\times\,10^6$ and $3\,\times\,10^7\rm M_ødot$, and varying mass ratio. We find that, even at the time of merger, the number of galaxies around the LISA sources is too large ($\gtrsim\,10^2$) to allow direct host identification. However, if an X-ray counterpart is associated to the GW sources at $z\,<\,1$, all LISA fields at merger are populated by $łesssim\,10$ AGNs emitting above $\sim\, 10^-17 \, \rm erg\,cm^-2\,s^-1$. For sources at higher redshifts, the poorer sky-localization causes this number to increase up to $\sim\, 10^3$. Archival data from eRosita will allow discarding $\sim\, 10\%$ of these AGNs, being too shallow to detect the dim X-ray luminosity of the GW sources. Inspiralling binaries in an active phase with masses $łesssim\,10^6M_ødot$ at $z\,łeq\,0.3$ can be detected, as early as $10$ hours before the merger, by future X-ray observatories in less than a few minutes. For these systems, $łesssim\,10$ AGNs are within the LISA sky-localization area. Finally, the LISA-Taiji network would guarantee the identification of an X-ray counterpart $10$ hours before merger for all binaries at $z\,łesssim\,1$.

@misc{lops2022galaxy, abstract = {LISA will extend the search for gravitational waves (GWs) at $0.1\,{-}\,100$ mHz where loud signals from coalescing binary black holes of $ 10^4 \,{-}\,10^7\,\rm M_{\odot}$ are expected. Depending on their mass and luminosity distance, the uncertainty in the LISA sky-localization decreases from hundreds of deg$^2$ during the inspiral phase to fractions of a deg$^2$ after the merger. By using the semi-analytical model L-Galaxies applied to the Millennium-I merger trees, we generate a simulated Universe to identify the hosts of $z\,{\leq}\,3$ coalescing binaries with total mass of $3\,{\times}\,10^{5}$, $3\,{\times}\,10^6$ and $3\,{\times}\,10^7\rm M_{\odot}$, and varying mass ratio. We find that, even at the time of merger, the number of galaxies around the LISA sources is too large (${\gtrsim}\,10^2$) to allow direct host identification. However, if an X-ray counterpart is associated to the GW sources at $z\,{<}\,1$, all LISA fields at merger are populated by ${\lesssim}\,10$ AGNs emitting above ${\sim}\, 10^{-17} \, \rm erg\,cm^{-2}\,s^{-1}$. For sources at higher redshifts, the poorer sky-localization causes this number to increase up to ${\sim}\, 10^3$. Archival data from eRosita will allow discarding ${\sim}\, 10\%$ of these AGNs, being too shallow to detect the dim X-ray luminosity of the GW sources. Inspiralling binaries in an active phase with masses ${\lesssim}\,10^6\rm M_{\odot}$ at $z\,{\leq}\,0.3$ can be detected, as early as $10$ hours before the merger, by future X-ray observatories in less than a few minutes. For these systems, ${\lesssim}\,10$ AGNs are within the LISA sky-localization area. Finally, the LISA-Taiji network would guarantee the identification of an X-ray counterpart $10$ hours before merger for all binaries at $z\,{\lesssim}\,1$.}, added-at = {2022-07-25T10:54:27.000+0200}, author = {Lops, Gaia and Izquierdo-Villalba, David and Colpi, Monica and Bonoli, Silvia and Sesana, Alberto and Mangiagli, Alberto}, biburl = {https://www.bibsonomy.org/bibtex/2809cddd5a427aabd8349e153fca58a21/gpkulkarni}, description = {Galaxy fields of LISA massive black hole mergers in a simulated Universe}, interhash = {3e71e0a48af4b7f402d963b594fe99d3}, intrahash = {809cddd5a427aabd8349e153fca58a21}, keywords = {library}, note = {cite arxiv:2207.10683Comment: 25 pages, 14 Figures, To be submitted to MNRAS}, timestamp = {2022-07-25T10:54:27.000+0200}, title = {Galaxy fields of LISA massive black hole mergers in a simulated Universe}, url = {http://arxiv.org/abs/2207.10683}, year = 2022 }