Featured Research

from universities, journals, and other organizations

Seeing The Invisible. First Dark Galaxy Discovered?

Date:
February 25, 2005
Source:
University Of Manchester
Summary:
A British-led team of astronomers using The University of Manchester's Lovell Telescope in Cheshire have discovered an object that appears to be an invisible galaxy made almost entirely of dark matter -- the first ever detected.

The ellipse shows the region of sky where the dark galaxy was found - image taken by Cardiff Astronomers using the Isaac Newton Telescope on La Palma.

A British-led team of astronomers using The University of Manchester's Lovell Telescope in Cheshire have discovered an object that appears to be an invisible galaxy made almost entirely of dark matter -- the first ever detected.

Related Articles


A dark galaxy is an area in the universe containing a large amount of mass that rotates like a galaxy, but contains no stars. Without any stars to give light, it could only be found using radio telescopes.

Following its initial detection at the Jodrell Bank Observatory, the sighting was confirmed with the Arecibo telescope in Puerto Rico. The unknown material that is thought to hold these galaxies together is known as `dark matter', but scientists still know very little about what that is.

The international team from the UK, France, Italy and Australia has been searching for dark galaxies using not visible light, but radio waves. In the Virgo cluster of galaxies, about 50 million light years away, they found a mass of hydrogen atoms a hundred million times the mass of the Sun.

Dr Robert Minchin from Cardiff University is one of the UK astronomers who discovered the mysterious galaxy, named VIRGOHI21, and explains: 'From the speed it is spinning, we realised that VIRGOHI21 was a thousand times more massive than could be accounted for by the observed hydrogen atoms alone. If it were an ordinary galaxy, then it should be quite bright and would be visible with a good amateur telescope. But, even using the large Isaac Newton Optical Telescope in La Palma, no trace of stars was seen ' it must thus contain matter that we cannot see ' so called dark matter.

Professor Andrew Lyne, Director of the Jodrell Bank Observatory, commented: 'We are delighted that the efforts by engineers at the Observatory and Cardiff University in building the Multi-Beam receiver system used for these observations had proved so fruitful. This exciting discovery shows that radio telescopes still have a very major role in helping to understand the Universe in which we live."

Further details, supporting images and contact details can be found at: http://www.jb.man.ac.uk/news/darkgalaxy/


Story Source:

The above story is based on materials provided by University Of Manchester. Note: Materials may be edited for content and length.


Cite This Page:

University Of Manchester. "Seeing The Invisible. First Dark Galaxy Discovered?." ScienceDaily. ScienceDaily, 25 February 2005. <www.sciencedaily.com/releases/2005/02/050224101540.htm>.
University Of Manchester. (2005, February 25). Seeing The Invisible. First Dark Galaxy Discovered?. ScienceDaily. Retrieved March 26, 2015 from www.sciencedaily.com/releases/2005/02/050224101540.htm
University Of Manchester. "Seeing The Invisible. First Dark Galaxy Discovered?." ScienceDaily. www.sciencedaily.com/releases/2005/02/050224101540.htm (accessed March 26, 2015).

Share This


More From ScienceDaily



More Space & Time News

Thursday, March 26, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Supermassive Blackhole Detector Ready for Business

Supermassive Blackhole Detector Ready for Business

Reuters - Innovations Video Online (Mar. 25, 2015) — Construction of the world&apos;s largest and most powerful observatory designed to detect and analyze gamma rays has been completed in Mexico. Gamma ray particles are considered the most energetic in the universe and scientists hope to use the observatory to learn more about the supernovas and black holes that produce them. Ben Gruber reports. Video provided by Reuters
Powered by NewsLook.com
Rocket Blasts Off Carrying U.S. Air Force GPS Satellite

Rocket Blasts Off Carrying U.S. Air Force GPS Satellite

Reuters - News Video Online (Mar. 25, 2015) — A U.S. Air Force GPS IIF-9 satellite launches aboard a United Launch Alliance Delta IV rocket into semi-synchronous orbit. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Opportunity's Marathon: The Mars Rover Just Keeps Going

Opportunity's Marathon: The Mars Rover Just Keeps Going

Newsy (Mar. 24, 2015) — NASA&apos;s Opportunity Mars Rover finished a full marathon, making it the first human creation to do a full 26.2 miles on another planet. Video provided by Newsy
Powered by NewsLook.com
Twin Astronaut to Break NASA Record in Study

Twin Astronaut to Break NASA Record in Study

AP (Mar. 23, 2015) — NASA astronaut Scott Kelly will be the first American to spend a year aboard the International Space Station in an experiment to test human endurance in space, while his twin brother&apos;s health is compared on Earth. (March 23) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins