Printer Friendly

Astronomers get first glimpse of 'glue' of universe.

Washington, Jan. 20 ( ANI ): Astronomers have found a distant quasar illuminating a vast nebula of diffuse gas, revealing for the first time part of the network of filaments believed to connect galaxies in a cosmic web.

Using the 10-meter Keck I telescope at the W. M. Keck Observatory in Hawaii, the researchers detected a very large, luminous nebula of gas extending about 2 million light-years across intergalactic space.

In this study, the researchers detected the fluorescent glow of hydrogen gas resulting from its illumination by intense radiation from the quasar.

The hydrogen gas illuminated by the quasar emits ultraviolet light known as Lyman alpha radiation. The distance to the quasar is so great (about 10 billion light-years) that the emitted light is "stretched" by the expansion of the universe from an invisible ultraviolet wavelength to a visible shade of violet by the time it reaches the Keck telescope and the LRIS spectrometer used for this discovery.

Knowing the distance to the quasar, the researchers calculated the wavelength for Lyman alpha radiation from that distance and built a special filter for LRIS to get an image at that wavelength.

Sebastiano Cantalupo, first author of the paper and a postdoctoral fellow at UC Santa Cruz, said that they think this is part of a filament that may be even more extended than this, but they only see the part of the filament that is illuminated by the beamed emission from the quasar.

The study has been published in the journal Nature. ( ANI )

Copyright 2014 aninews.in All rights reserved. Provided by Syndigate.info , an Albawaba.com company
COPYRIGHT 2014 Al Bawaba (Middle East) Ltd.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2014 Gale, Cengage Learning. All rights reserved.

Article Details
Printer friendly Cite/link Email Feedback
Publication:Asian News International
Date:Jan 20, 2014
Words:265
Previous Article:Jayawardene becomes first Sri Lankan to reach 11,000 run milestone.
Next Article:Cibulkova shocks third seed Sharapova at Australian Open.
Topics:

Terms of use | Privacy policy | Copyright © 2019 Farlex, Inc. | Feedback | For webmasters