Visualization of radiation of a gravitational wave from a pair of orbital compact objects. The future cosmic gravitational wave observatory LISA will be able to observe hundreds of such binary stars in the Milky Way, including approximately 50 binaries found in globular clusters
The first detection of gravitational waves from colliding black holes outside our galaxy opened a new way of understanding the universe. Since finding September 14, 2015, we managed to find 4 more binary black holes and a pair of neutron stars.
Now engineers are creating a new detector to expand the search capabilities. It is expected that the observatory of the new generation LISA will go into space already in 2034 and will be sensitive to gravitational waves with a lower frequency.
New research from Northwestern University predicts that LISA will be able to find dozens of binaries in globular clusters of the Milky Way. They will contain all combinations of the components of a black hole, a neutron star and a white dwarf. This is the first analysis using realistic globular cluster models. LISA is sensitive to systems of the Milky Way and expands the breadth of the spectrum of gravitational waves, allowing you to study various types of objects that are not included in the LIGO survey.
There are approximately 150 observable globular clusters in the Milky Way, such as M30, shown in the image from the Hubble Space Telescope. It is a dense environment with millions of stars tightly packed together. Such clusters are considered effective factories of sources of gravitational waves, which can be observed in LIGO and the future LISA observatory.
At the moment, 150 globular clusters have been found on the territory of our galaxy. The study reports that one of the three clusters will generate a source for LISA. Also, the device will be able to find about 8 black holes in the Andromeda galaxy and another 80 in Virgo.
Globular cluster is a spherical structure with the presence of from hundreds of thousands to millions of stars combined by common gravity. Considered one of the oldest stellar populations in the galaxy. Scientists have used more than a hundred fully developed globular clusters with properties similar to real structures in our galaxy.