Ultrafast star escapes black hole

September 21, 2006

At last astronomers have a method to accurately measure the speed of stars within a galaxy containing a black hole. Dutch researcher Alessia Gualandris developed the algorithm for this in cooperation with the Astronomical Institute "Anton Pannekoek" and the Amsterdam Informatics Institute. The outcomes of this groundbreaking research provide convincing evidence for the relationship between galactic nuclei, heavy black holes and ultrafast stars in the Milky Way.

Galactic nuclei are the cores of galaxies, groups of thousands to millions of stars that are held together by gravity. As stars in the nucleus are so close together, interactions readily occur. If ultraheavy black holes (black holes several million times heavier than the sun) are also involved, stars can be slung out of the galaxy (for example the Milky Way) at speeds of more than one thousand kilometres per second. The astrophysical reasons for this are simple but can only be demonstrated with detailed calculations on specially developed computers.

The interdisciplinary research team of which Gualandris was a member (and that cooperated with Japanese, German and US researchers) spent the past four years developing algorithms and special computers in order to accurately calculate the dynamic and internal evolution of a galactic nucleus. However, these calculations can only be performed if the interactions between all of the stars are very accurately described. Gualandris developed a special new algorithm to perform these calculations efficiently on a parallel computer. With this it was at last possible to simulate systems of more than one million stars.

The research results are important for further research into galaxies, black holes and the interaction between these. Dense stellar systems like star clusters or galaxies are fascinating for both astrophysicists and computer scientists due to their enormous physical diversity and because calculations of their high mobility are numerically very complex. Up until now these calculations were difficult to perform as these systems are unsuitable for analytical methods and approximations are not accurate enough. With Gualandris' method the numerical problems have been solved and the origin of ultrafast stars in the Milky Way can be explained.

Source: NWO

Explore further: Environmentally stable laser emits exceptionally pure light

Related Stories

Environmentally stable laser emits exceptionally pure light

January 31, 2019

Researchers have developed a compact laser that emits light with extreme spectral purity that doesn't change in response to environmental conditions. The new potentially portable laser could benefit a host of scientific applications, ...

Holy cow! Mysterious blast studied with NASA telescopes

January 11, 2019

A brief and unusual flash spotted in the night sky on June 16, 2018, puzzled astronomers and astrophysicists across the globe. The event—called AT2018cow and nicknamed "the Cow" after the coincidental final letters in its ...

Astronomers discover an unusual nuclear transient

January 23, 2019

An international group of astronomers has detected an unusual nuclear transient in the nucleus of a weakly active galaxy. The new transient was identified by the OGLE-IV Transient Detection System and received designation ...

Recommended for you

Fish-inspired material changes color using nanocolumns

March 20, 2019

Inspired by the flashing colors of the neon tetra fish, researchers have developed a technique for changing the color of a material by manipulating the orientation of nanostructured columns in the material.

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.