Posts Tagged ‘galatic wind’

A Simulation Of The Universe With Realistic Galaxies

December 29, 2014 Leave a comment

Credit: J. Schaye et al. 2015

Credit: J. Schaye et al. 2015

The simulations took several months to run at the “Cosmology Machine” in Durham and at “Curie” in Paris, among the largest computers used for scientific research in the U.K. and France, respectively. Astronomers can now use the results to study the development of galaxies from almost 14 billion years ago until now. The results will be published in Monthly Notices of the Royal Astronomical Society on 1 January.

or years, astronomers have studied the formation of galaxies using computer simulations, but with limited success. The galaxies that formed in previous simulations were often too massive, too small, too old and too spherical.

The galaxies formed in the EAGLE-simulation (Evolution and Assembly of GaLaxies and their Environments) are a much closer reflection of real galaxies thanks to the strong galactic winds, which blow away the gas supply needed for the formation of stars. EAGLE’s galaxies are lighter and younger because fewer stars form and they form later. In the EAGLE simulation these galactic winds – which are powered by stars, supernova explosions and supermassive black holes – are stronger than in earlier simulations.

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Shedding Light On The Power Of M 82’s Superwinds

January 20, 2013 Leave a comment

An international team of astronomers, led by Dr. Kazuya Matsubayshi (Kyoto University), has discovered that outflows of gas from starburst galaxy M 82 collide with a “cap” of gas clouds 40,000 light years away from the galactic disk. Shockwaves from M 82’s central starburst region are the most likely source of the bright clouds within the cap. The large light-gathering power of Subaru Telescope’s 8.2-m mirror and its ability to produce highly detailed images enabled the researchers to make these findings, which provide important clues about the wind’s power.

The central regions of starburst galaxies are sites of immense star formation. They give birth to thousands of massive stars, which are dozens of times heavier than the Sun and then explode as supernovae when they die. Many supernovae explosions heat the gas around them to temperatures of more than a million degrees, and this hot gas flows out from the galaxy as galactic wind. These winds are so powerful that they may play an important role in the evolution of galaxies and the inter-galactic medium.

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