“Unveiled” –Secret Law of Galaxy Clusters

 
Galaxy-cluster-9

 

"The law is so simple that we can use it to calibrate cluster mass-observable relations, which are a key ingredient for studying the cosmological laws of the Universe. Our research draws us closer to explaining the evolutionary history of clusters and the Universe," said Yutaka Fujita at Osaka University.


An international collaboration between Fujita and researchers from Taiwan, Italy, Japan, and the United States found a new fundamental law that stipulates the evolution of galaxy clusters. They recently reported the study in The Astrophysical Journal. Analysis of gravitational lensing data by an international research team reveals that the evolution of galaxy clusters is dictated by a surprisingly simple law, which clearly shows that they are still growing.

 

Using data from NASA's Chandra X-ray Observatory, Hubble Space Telescope, and the Keck Observatory in Hawaii for the image above, astronomers were able to determine the three-dimensional geometry and motion in the system MACS J0717.5+3745 (or MACS J0717, for short), located about 5.4 billion light-years from Earth.

Galaxy clusters are the largest celestial body in the Universe. However, it has been difficult to measure their size and mass accurately because they mainly consist of dark matter that we cannot observe directly. One way to observe the dark matter indirectly is to use the gravitational lensing effect based on Einstein's theory of relativity. Light rays from a galaxy behind a cluster are pulled by the gravity of the cluster as they pass through it, and their paths are bent.

This is exactly the same effect as a lens, focusing the light of the distant galaxy and distorting its shape. If we can measure the distortion of the shape for many background galaxies, we can reveal the gravitational field of the cluster, and as a result, we can accurately measure its size and mass.

"One difficulty in our research," explains Keiichi Umetsu at Academia Sinica in Taiwan, "was that accurate measurements of the distortion were necessary." To overcome this problem, the research team has used precise observational data from NASA's Hubble Space Telescope and the Subaru Telescope operated by the National Astronomical Observatory of Japan.

Combining with gas temperature data from the Chandra X-ray satellite, the research group statistically examined those latest data and found that they conform to a simple law represented only by the size, mass, and gas temperature of clusters. Moreover, by making full use of computer simulations, they showed that clusters have grown over 4 to 8 billion years according to the law. Theoretically, the law means that those gigantic clusters are still in adolescence, growing by drawing a large amount of surrounding substances with their strong gravity.

"We've discovered the law that regulates the growth of clusters of galaxies," Fujita says. "Clusters have an internal structure uniquely created in an early growth spurt."

The Daily Galaxy via Osaka University http://resou.osaka-u.ac.jp/en/top

Most Popular Space & Science Headlines

Stephen Hawking's Great Question –"Why Isn't the Milky Way Crawling With Mechanical or Biological Life?"

"Alien Minds" –'Artificial Intelligence Is Already Out There, and It's Billions of Years Old' (VIDEO)

"Point of No Return" –MIT Scientist Predicts the Event Horizon for Earth's 6th Mass Extinction 

A Neutron Star Collision in Our Milky Way Neighborhood Could Destroy Earth

 "300-Million Nuclear Bombs" –New Insights Into Global Impact of Titanic Chicxulub Mass-Extinction Event

Stephen Hawking: Wake Up, Science Deniers! –"Earth is Morphing into Venus" (WATCH Today's 'Galaxy' Stream)

"Evolutionary Leap?" AI is Mimicing the Human Brain –"But Several Orders of Magnitude Faster and More Efficiently

China Creates a Laser of Mind-Boggling Power –"Could Rip Space Asunder, Breaking the Vacuum"

"Stop Saying That Dinosaurs Went Extinct. They Didn't"

Eso50_obs_compo (1)

"The Galaxy" in Your Inbox, Free, Daily