Subscribe to our free daily newsletters
. 24/7 Space News .




Subscribe to our free daily newsletters



VLT Unveils Metal Rich Distant Galaxy

A distant quasar is used as a beacon in the Universe. Galaxies and intergalactic material that lie between the quasar and us will reveal themselves by the features seen in the spectrum. Figure courtesy of John Webb.
by Staff Writers
Garching, Germany (SPX) Feb 15, 2006
Astronomers have found a metal-rich hydrogen cloud in the distant universe that they said could help solve the problem of missing metal in the cosmos and provide new insights into how galaxies form.

"Our discovery shows that significant quantities of metals are to be found in very remote galaxies that are too faint to be directly seen", said Celine Peroux, the lead author of the paper presenting the research.

The team used the high-resolution spectrograph UVES on the European Southern Observatory's Very Large Telescope in Chile to study the light emitted by a quasar located 9 billion light-years away that is partially absorbed by an otherwise invisible galaxy sitting 6.3 billion light-years away along the line of sight.

Spectral analysis shows that the galaxy consists of four times more metals than the Sun, and the data represent the first time astronomers have found such a large amount of metals in a very distant object. The observations also indicate the galaxy in question must be very dusty.

Almost all of the elements present in the universe were formed inside stars, which themselves are members of galaxies. By estimating how many stars formed over the history of the universe, scientists can estimate how much metal should have been produced.

For years, however, this apparently simple deduction has remained at odds with observational data. When astronomers have attempted to calculate the amount of metals observable in distant astronomical objects, the result always falls short of the predicted value by a factor of 10.

One potential mitigating ingredient has been the inherent bias in observations of distant galaxies, because only the largest and most active are detected, while the smaller and fainter members of the population remain uncounted. So astronomers recently began using quasars - the brightest distant objects known - as beacons in an attempt to flush out the more obscure galaxies.

Interstellar clouds of gas in galaxies, located between the quasars and Earth's telescopes, absorb parts of the light emitted by the giant cosmic beacons. The resulting spectral data lines contain dips that can be attributed to well-known elements. Thus, astronomers can measure the amount of metals present in galaxies that are otherwise invisible.

"This can best be done by high-resolution spectrographs on the largest telescopes, such as the Ultra-violet and Visible Echelle Spectrograph (UVES) on ESO's Kueyen 8.2-m telescope at the Paranal Observatory," Peroux said.

Her team studied the spectrum of the quasar SDSS J1323-0021 in detail, and found it shows clear indications of absorption by a cloud of hydrogen and metals located between the quasar and the telescope. Careful analysis of the spectrum revealed the galaxy to be four times richer in zinc than the Sun, while other metals such as iron appear to have condensed into vast clouds of dust grains.

"If a large number of such 'invisible' galaxies with high metal content were to be discovered, Peroux said, "they might well alleviate considerably the missing metals problem."

Related Links
European Southern Observatory



Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News


Rogue Pulsar Speeding Out Of The Galaxy
Charlottesville VA (SPX) Feb 15, 2006
Astronomers have precisely calculated the speed of the Milky Way's fastest observed pulsar: It is heading out of the galaxy at more than 670 miles a second, propelled by an explosive kick it received at birth some 2.5 million years ago.







  • NASA'S Newest Explorers Become Astronauts
  • Malaysia Unveils Candidates For Astronaut Race
  • ESA Seeking To Challenge Conventional Space Systems
  • NASA Outlines FY 2006 Operating Plan

  • Home Plate Brings Mars Exploration To Every Desktop
  • Roving The Red Planet
  • 'Home Plate' Continues To Mystify Mars Rover Team
  • New Viewing Technique Bolsters Case For Life On Mars

  • Arianespace And Roscosmos Sign Contract For Soyuz Operations At Guiana Space Center
  • Russia, France Sign Deal On Soyuz Missile Launches
  • Plesetsk To Launch 8 Satellites, 2 ICBMs In 2006
  • Sea Launch Re-Starts Countdown For Echostar X Launch

  • NASA, UNH Scientists Uncover Lost Maya Ruins From Space
  • NASA Satellite Technology Helps Fight Invasive Plant Species
  • Tandem Sat Data Add Depth To Canadian Wilderness Maps
  • NASA Awards Colorado Satellite Observation Grants

  • New Horizons Set For A Comfortable Cruise Out To Jupiter And Pluto Transfer
  • Questioning Pluto
  • New Outer Planet Is Larger Than Pluto
  • New Horizon On Course For Jupiter Transfer To Pluto And Beyond

  • Astronomers Discover 'RRATS' In The Cosmos
  • Galactic Center Found To Glow Unevenly
  • Rogue Pulsar Speeding Out Of The Galaxy
  • VLT Unveils Metal-Rich Distant Galaxy

  • The Moon Program The NASA Administrator Is Really Planing For
  • Ancient Impacts Created Man In The Moon
  • The Lunar Olympics
  • The Smell Of Moondust

  • Trimble Offers New Modular GPS Solutions For Construction Industry Applications
  • Tetra Tech Wins Federal Aviation Administration Satellite Navigation Assistance Contract
  • Lockheed Martin GPS Updates Enhance System Accuracy Up To 15 Percent
  • Putin And Ivanov Discuss Future Of GLONASS System

  • The content herein, unless otherwise known to be public domain, are Copyright 1995-2006 - SpaceDaily.AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA PortalReports are copyright European Space Agency. All NASA sourced material is public domain. Additionalcopyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement