Universe  ID: 14402

Simulated Gravitational Wave All-Sky Image

Astronomers using simulated data have produced a glimpse of the sky as it would appear in gravitational waves, cosmic ripples in space-time generated by orbiting objects. The image shows how space-based gravitational wave observatories expected to launch in the next decade will enhance our understanding of our galactic home.

Since 2015, ground-based observatories have detected about a hundred events representing the mergers of systems that pair stellar-mass black holes, neutron stars, or both. The signals typically last less than a minute, have relatively low frequencies, can appear anywhere in the sky, and their sources lie far beyond our galaxy.

Binary systems also fill the Milky Way, and astronomers expect many of them to contain compact objects like white dwarfs, neutron stars, and black holes in tight orbits. But to "hear" their gravitational waves requires a space-based observatory because their frequencies are too low for ground-based detectors.

Astronomers call these systems UCBs (ultracompact binaries), and they expect that future observatories like LISA (Laser Interferometer Space Antenna), which is led by ESA (European Space Agency) in collaboration with NASA, will detect tens of thousands of them. UCBs are typically difficult to spot – they are usually faint in visible light, and astronomers currently know of only a handful with orbital periods shorter than an hour. Discovering many new UCBs is one of LISAs main objectives.

Using data simulating the expected distribution and gravitational wave signals of these systems, the Goddard team developed a way to combine the data into an all-sky view of the galaxy’s UCBs.

This image is directly analogous to an all-sky view of the sky in a particular type of light, such as visible, infrared, or X-rays. The promise of gravitational waves is that they offer astronomers a way to observe the universe in a totally different way, something this image really brings home.


James Ira Thorpe (NASA/GSFC): Lead Visualizer
Francis Reddy (University of Maryland College Park): Science Writer
Scott Wiessinger (KBR Wyle Services, LLC): Producer
Please give credit for this item to:
NASA's Goddard Space Flight Center. However, individual items should be credited as indicated above.