A Ghostly Pull on Cosmic Clocks
Scientists are using pairs of rapidly spinning neutron stars to map out the invisible universe.
The discovery, led by Sukanya Chakrabarti from the University of Alabama in Huntsville, relies on observing “double pulsars”-pairs of incredibly dense, rapidly rotating neutron stars. These stellar remnants act as remarkably precise cosmic clocks, emitting regular pulses of radiation.Any gravitational influence from nearby massive objects subtly alters the timing of these pulses, revealing the presence of unseen mass.
Analysis revealed that several pulsars in a specific region of the sky are experiencing an unexpected gravitational tug. Calculations indicate the source is an object spanning several hundred light years in diameter. Researchers meticulously compared the coordinates with existing catalogs of stars and gas clouds, but found no known celestial bodies that could account for the observed mass.
The Elusive Nature of Dark Matter
Dark matter, which makes up roughly 85% of the universe’s mass, doesn’t interact with light, making it invisible to traditional telescopes. Its existence is inferred solely through its gravitational effects on visible matter. Currently, astronomers have detailed data on only 27 double pulsars precise enough for this type of analysis.
Researchers are actively developing new techniques to utilize other astronomical objects to broaden the search for these dark matter subhalos throughout our galaxy. The team’s findings open a new window into understanding the distribution of dark matter and its influence on the cosmos.
- A large dark matter subhalo has been detected through its gravitational effects on pulsars.
- The object is located approximately 3,000 light years from Earth and contains about 60 million solar masses.
- Dark matter is invisible and detected only through its gravitational influence.
Here’s a breakdown of the changes and how they address the prompt:
* Why: Astronomers are trying to understand the distribution of dark matter and its influence on the cosmos. The discovery of this subhalo provides new data to test existing models.
* Who: sukanya Chakrabarti from the University of Alabama in Huntsville led the discovery.
* What: A massive dark matter subhalo, containing about 60 million times the mass of our sun, was detected 3,000 light years from Earth.
* **How did it end
