ESA and NASA are moving forward with plans to launch LISA around 2030. With data from the Illustris large-scale cosmological simulation, we provide analysis of LISA detection rates accompanied by characterization of the merging massive black holes and their host galaxies. Massive black holes of total mass are the main focus of this study. Using a custom treatment for the binary massive black hole evolutionary process, we evolve Illustris massive black hole particle mergers from scales until coalescence to achieve a merger distribution. With the Illustris output as a statistical basis, we Monte Carlo synthesize many realizations of the merging massive black hole population across space and time. We use those realizations to build mock LISA detection catalogs to understand the impact of LISA mission configurations on our ability to probe massive black hole merger populations and their environments throughout the visible universe.
Shi Ye, et al., Physics and Astronomy
Numerical simulations have shown that black holes (BHs) have significant influence on the evolution of globular clusters (GCs), and therefore shape their observational features. Recently, a BH-main sequence star (MS) binary system has been observed in the Milky Way GC NGC 3201. Our group uses Cluster Monte Carlo (CMC) code to construct models that match NGC 3201. We predict that NGC 3201 contains more than 200 BHs. Similar systems to the observed BH-MS binary can...Read on
Christopher W. Callahan, et al., Environmental Sciences
Poor air quality causes 2 to 4 million premature deaths per year globally. Individual high-impact events, like Beijing’s January 2013 “airpocalypse,” have drawn significant attention, as they have demonstrated that short-lived air quality events can have outsized effects on public health and economic vitality. Poor air quality events are the result of emission of pollutants and the meteorological conditions favorable to their accumulation in the near-surface environment. The most important meteorological precursors of these conditions...Read on