• Subscribe

iSGTW Image of the week - In the beginning

Image of the week - In the beginning


The filamentary structure in this simulation in a cube covering 1.5 billion light years per side is also seen in real life observations such as the Sloan Digital Sky Survey. A particularly massive galaxy cluster, with a mass 2 quadrillion times that of the Sun can be seen in the center.
Image courtesy of Matt Hall, NCSA

Astronomers can "time travel" back into the universe's early history using a number of "red shift" surveys that record objects in sections of the sky that are ever farther away-and therefore older, since their light travels billions of years to reach the Earth.

To help understand these observations, UC San Diego cosmologist Michael Norman and collaborators are using TeraGrid to crunch a simulation that uses the ENZO cosmology code, a code that can simulate the universe from first principles, starting near the Big Bang.

In work submitted to the Astrophysical Journal, the researchers have conducted the most detailed simulations ever of a region of the universe 500 megaparsecs across (more than 1.5 billion light years).

The size and detail of their results will be useful to other researchers involved in spatial mapping and simulated sky surveys.

The team's detailed simulations required ENZO's adaptive mesh refinement codes, which begin with a coarse grid spacing and then spawn more detailed (and more computationally demanding) subgrids in higher density regions.

"We achieved unprecedented detail by reaching seven levels of subgrids throughout the survey volume-something never done before-producing more than 400,000 subgrids, which we could only do thanks to the two large-memory TeraGrid systems," says San Diego Supercomputer Center computational scientist Robert Harkness, who carried out about 500,000 processor hours of runs with astrophysicist Brian O'Shea of Los Alamos National Laboratory.

This story features in TeraGrid's 2007 Science Highlights booklet, which was released at SC07.

Join the conversation

Do you have story ideas or something to contribute? Let us know!

Copyright © 2019 Science Node ™  |  Privacy Notice  |  Sitemap

Disclaimer: While Science Node ™ does its best to provide complete and up-to-date information, it does not warrant that the information is error-free and disclaims all liability with respect to results from the use of the information.

Republish

We encourage you to republish this article online and in print, it’s free under our creative commons attribution license, but please follow some simple guidelines:
  1. You have to credit our authors.
  2. You have to credit ScienceNode.org — where possible include our logo with a link back to the original article.
  3. You can simply run the first few lines of the article and then add: “Read the full article on ScienceNode.org” containing a link back to the original article.
  4. The easiest way to get the article on your site is to embed the code below.