MessageToEagle.com

Famous Missing Dwarf Problem - A New Explanation

1 February, 2013

Share this story:
Follow us:

MessageToEagle.com - Astronomers of the international CLUES collaboration have identified "Cosmic Web Stripping" as a new way of explaining the famous missing dwarf problem: the lack of observed dwarf galaxies compared with that predicted by the theory of Cold Dark Matter and Dark Energy.

High-precision observations over the last two decades have indicated that our Universe consists of about 75% Dark Energy, 20% Dark Matter and 5% ordinary matter.

Galaxies and matter in the universe clump in an intricate network of filaments and voids, known as the Cosmic Web.

Computer experiments on massive supercomputers have shown that in such a Universe a huge number of small "dwarf" galaxies weighing just one thousandth of the Milky Way should have formed in our cosmic neighbourhood.

Yet only a handful of these galaxies are observed orbiting around the Milky Way.

The observed scarcity of dwarf galaxies is a major challenge to our understanding of galaxy formation.

An international team of researchers has studied this issue within the Constrained Local UniversE Simulations project (CLUES).

The CLUES simulations use the observed positions and peculiar velocities of galaxies within Tens of Millions of light years of the Milky Way to accurately simulate the local environment of the Milky Way.

"The main goal of this project is to simulate the evolution of the Local Group - the Andromeda and Milky Way galaxies and their low-mass neighbours - within their observed large scale environment", said Stefan Gottlöber of the Leibniz Institute for Astrophysics Potsdam.


Cosmic Web Stripping, Visualization. Credits: Alejandro Benitez Llambay


Analysing the CLUES simulations, the astronomers have now found that some of the far-out dwarf galaxies in the Local Group move with such high velocities with respect to the Cosmic Web that most of their gas can be stripped and effectively removed.

They call this mechanism "Cosmic Web Stripping", since it is the pancake and filamentary structure of the cosmos that is responsible for depleting the dwarfs' gas supply.


Cosmic Web Stripping removes gas from a very fast dwarf galaxy crossing the local web. The image is a visualization of a CLUES simulation. The arrow symbolizes the velocity oft he dwarf, located right below. Credits: Alejandro Benítez Llambay


Zoom into the region where the dwarf is located. Credit: Alejandro Benítez Llambay


"These dwarfs move so fast that even the weakest membranes of the Cosmic Web can rip off their gas", explained Alejandro Benítez LLambay, PhD student at the Instituto de Astronomía Teórica y Experimental of the Universidad Nacional de Córdoba in Argentina, and first author of the publication of this study.

Without a large gas reservoir out of which to form stars, these dwarf galaxies should be so small and dim that they would be hardly be visible today.

The missing dwarfs may simply be too faint to see.

MessageToEagle.com

See also:
Researchers Have Identified The First "Bone" Of The Milky Way

Follow MessageToEagle.com for the latest news on Facebook and Twitter !

Don't Miss Our Stories! Get Our Daily Email Newsletter

Enter your email address:


Once you have confirmed your email address, you will be subscribed to the newsletter.

Recommend this article:

Teleportation Experiments Continue - Record-Breaking Distance of 143 Kilometers Achieved!

Violent Behavior Of Our Sun - Massive 500,000 Mile Long Filament Observed

First Massive Galaxies Lit Up The Early Universe

Intense Blue Lightning On Saturn Visible From Space In Broad Daylight!

Subscribe To Our Space, Astronomy, Astrophysics, Earth and Xenology News!

Grab the latest RSS feeds right to your reader, desktop or mobile phone.

Subscribe to RSS headline updates from:
Powered by FeedBurner

Go to - MAIN PAGE

Copyright © MessageToEagle.com All rights reserved.
Go to - MAIN PAGE


Get our top stories
Follow MessageToEagle.com

 Subscribe in a reader

Join Us On Facebook!

Other Popular Articles

Universe:


Juno Spacecraft's Critical Mission - To Uncover The Secrets Hidden Beneath Jupiter's Mysterious Clouds

What’s Going On Out There? - NASA's RBSP Spacecraft Will Meet ‘Killer Electrons’ And Other Dangerous Phenomena

New Photos Of Saturn And Its Moon Titan - See A Striking Change Of Colors!

Beautiful and Mysterious Superbubble In The Large Magellanic Cloud Observed By Chandra

WISE Discovers Millions Of Black Holes And 1,000 Extreme Galaxies Called Hot DOGS

Dawn Spacecraft Is Heading Towards Dwarf Planet Ceres To Investigate The Formation Of Our Solar System

Lunar Paradox Problem: Moon Origin In Focus Again!

There Is Sugar In That Star! Life Building Blocks Discovered Around A Sun-Like Star

First Planetary System Orbiting Two Suns Found By Kepler

Astronomers Test Einstein In A New Regime Using Pair of Burnt-Out Stars

The Universe Will Vanish In 100 Billion Years - Says Nobel Prize Winner Brian P. Schmidt

Our Creator Is A Cosmic Computer Programmer - Says JPL Scientist

Mysterious, Huge 'Pigtail' Molecular Cloud Discovered In The Galactic Center

Astronomers See The Infant Universe's Oldest Galaxies Yet!

Star With The Secret Of Eternal Youth

Physicists Challenge Validity Of Big Bang Theory

Space-Time Crystal Computer That Can Outlive Even The Universe Itself!

Dawn Spacecraft Is Heading Towards Dwarf Planet Ceres To Investigate The Formation Of Our Solar System

New Photos Of Saturn And Its Moon Titan - See A Striking Change Of Colors!

What’s Going On Out There? - NASA's RBSP Spacecraft Will Meet ‘Killer Electrons’ And Other Dangerous Phenomena

Mysterious X-Rays From Jupiter Near The Poles

W3Counter