dark

close
Loading Image...
ScienceDaily: Your source for the latest research news and science breakthroughs -- updated daily
Science News
Share Blog Cite
Print Email Bookmark
Particles As Tracers For Milky Way's Most Massive Explosions: 'Dark Matter' Origins Of Mysterious Flux Challenged

ScienceDaily (Aug. 19, 2009) — Astronomers recently observed a mysterious flux of particles in the universe, and the hope was born that this may be the first observation of the remnants of "dark matter".
See also:
Space & Time

* Dark Matter
* Astrophysics
* Stars

Matter & Energy

* Quantum Physics
* Physics
* Wind Energy

Reference

* Supergiant
* Blue supergiant star
* Red supergiant star
* Stellar evolution

But scientists from the University of Gothenburg, Sweden, have shown that there is another explanation of the flux.

Several independent studies recently discovered a mysterious flux of electrons and positrons in the universe. Several theories were presented that suggested that these particles arise from the decay of "dark matter" - the hypothetical material that is believed to influence the rotation of galaxies. Dark matter is one of the most challenging questions in astrophysics. An international research group with members from the University of Gothenburg has now published new results showing that the mysterious flux actually arises from exploding stars.

Supernova remnants

Julia Becker, from the Department of Physics at the University of Gothenburg, and her colleagues show in the article, which has been published in the scientific journal Physical Review Letters, that the mysterious particle flux is the remnant of a supernova, from a star that was 15 times more massive than the sun. This star died and exploded in the Milky Way. When a star of this mass dies, most of its material is ejected and ploughs a pathway through a massive, stellar wind. This wind has been created earlier in the death process, when the star lost part of its original mass. The wind blows away from the star, and the final definitive explosion of the star then drives new material through the previously established wind.

A shock-wave in space

Electrons and positrons are accelerated during the process and create a shock-wave, similar to that formed when an aeroplane breaks the sound barrier. Julia Becker and her colleagues show that it is just such a shock-wave that has created the observed particle flux that has astounded scientists.

"This means, I'm afraid, that scientists will have to find another method of identifying dark matter", says Julia Becker.

Journal reference:

1. P. L. Biermann, J. K. Becker, A. Meli, W. Rhode, E. S. Seo, and T. Stanev. Cosmic Ray Electrons and Positrons from Supernova Explosions of Massive Stars. Physical Review Letters on 7 August. URL: http://link.aps.org/doi/10.1103/PhysRevLett.103.061101 DOI:, 2009; DOI: 10.1103/PhysRevLett.103.061101

Adapted from materials provided by University of Gothenburg.
Email or share this story:
| More
Need to cite this story in your essay, paper, or report? Use one of the following formats:
APA

MLA
University of Gothenburg (2009, August 19). Particles As Tracers For Milky Way's Most Massive Explosions: 'Dark Matter' Origins Of Mysterious Flux Challenged. ScienceDaily. Retrieved August 24, 2009, from http://www.sciencedaily.com­ /releases/2009/08/090811143954.htm
enlarge

V838 Monocerotis briefly became one of the brightest stars in our galaxy. Its outburst discovered in January 2002, observations have indicated that V838 is defying the conventional understanding of erupting stars and stellar life cycles. (Credit: NASA)
Ads by Google
Advertise here
500kW Energy Storage
Flywheel energy storage system for windfarm and renewable integration
www.pcorp.com.au
R&D in Russia and CIS
Carry out technology search with high-tech scientists and institutes
www.istc.ru
Pericole sexuale
Lipsa de informare poate duce la deces. Afla mai mult!
www.informarehpv.ro
Microsite on wind energy
Webcast, quiz, howto manual, FAQs, insights, discussion
www.leonardo-gallery.org
Energy Harvesting Event
3-4Nov09, Denver USA: Technology, Opportunities, Forecasts, Users
www.idtechex.com
Related Stories
Integral Disproves Dark Matter Origin For Mystery Radiation (Aug. 2, 2009) — A team of researchers working with data from ESA's Integral gamma-ray observatory has disproved theories that some form of dark matter explains mysterious radiation in the Milky ... > read more
Dark Fluid: Dark Matter And Dark Energy May Be Two Faces Of Same Coin (Feb. 1, 2008) — Astronomers believe they can "simplify the dark side of the universe" by shedding new light on two of its mysterious constituents. Only 4% of the universe is made of known material - the other 96% is ... > read more
How Fast Does Dark Matter Fall? (Oct. 1, 2006) — Dark matter is mysterious stuff. Scientists don't really know much about it at all, other than the fact that there seems to be a lot of it in the universe. Thanks to a new analysis by physicists at ... > read more
Dark Matter Disk In Our Galaxy, Supercomputer Simulation Shows (Sep. 16, 2008) — The Milky Way contains a disk of "dark matter," according to new calculations by astronomers. They have used the results of a supercomputer simulation to deduce the presence of this ... > read more
Search ScienceDaily
Number of stories in archives: 44,032
Find with keyword(s):

Enter a keyword or phrase to search ScienceDaily's archives for related news topics,
the latest news stories, reference articles, science videos, images, and books.
Ads by Google
Advertise here
Biogas Plant
Renew Energy is a supplier of biogas energy solutions. Read more
www.renewenergy.dk
Solar Panels for Sale-New
Cheap & Efficient 100w, 200w Panels EARN 80.2 cents per KWhr for 25yrs
www.ener4green.com
Einstein's Method
A Fresh Approach to QM & Relativity A Scholarly, Ontological Inquiry
www.einsteinsmethod.com

Just In:
Lightning's Mirror Image ... Only Much Bigger
Using Light To Teach Magnets New Tricks
Microchip Does 1,000 Chemical Reactions At Once
Naming Evolution's Winners And Losers
Inner 'Fingerprint' For Personal Medical Care
Why Sleep? To Boost Efficiency, Minimize Risk
Ultrathin LEDs: New Class Of Displays
Oxycholesterol: Greatest Heart Disease Risk?
Oxycholesterol: Greatest Heart Disease Risk?
Science Video News
First Stars In The Universe
Astronomers removed light from closer and better known galaxies and stars from pictures taken with the Spitzer Space Telescope. The remaining images. ... > full story

* Astronomers Spot Black Holes Using NASA's Chandra X-Ray Observatory
* Atmospheric Scientists Link Lightning to Ice Particles In Clouds
* Are Bioluminescent Bacteria Behind Milky Seas Legend?
* more science videos

Breaking News
... from NewsDaily.com

* Encyclopedia of Life grows; clues on ageing, pests
* Satellites put into orbit for Japan and Australia
* Scientists make "sugar bug" drug for bowel disease
* Gene swap experiment makes altering bugs easier
* Mercury-tainted fish found widely in U.S. streams
* more science news

In Other News ...

* Justice Dept advises pursuing CIA abuses: report
* U.S. point man on sanctions to press North Korea
* Singapore shoots down "rumor" of APEC attack plot
* Malaysia frees woman sentenced to caning
* Hurricane Bill kills 2 in U.S., drenches eastern Canada
* China trials over Xinjiang riot "likely this week"
* Fit-looking Fidel Castro appears on Cuban TV
* Warner Chilcott to buy P&G unit for $3 billion: sources
* more top news

Copyright Reuters 2008. See Restrictions.
Free Subscriptions
... from ScienceDaily
Get the latest science news with our free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

* Email Newsletters
* RSS Newsfeeds

Feedback
... we want to hear from you!
Tell us what you think of the new ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?

* Your Name:
* Your Email:
* Comments:
* Click button to submit feedback:

About This Site | Editorial Staff | Awards & Reviews | Contribute News | Advertise With Us | Privacy Policy | Terms of Use
Copyright © 1995-2009 ScienceDaily LLC — All rights reserved — Contact: editor@sciencedaily.com

* Health & Medicine
o Allergy
o Alternative Medicine
o Bird Flu
o Birth Control
o Breast Cancer
o Cancer
o Diabetes
o Diet and Weight Loss
o Diseases and Conditions
o Fitness
o Gene Therapy
o Heart Disease
o HIV and AIDS
o Lung Cancer
o Men's Health
o Nutrition
o Obesity
o Pharmacology
o Pregnancy and Childbirth
o Sexual Health
o Skin Care
o Stem Cells
o Women's Health
o ... more topics
* Mind & Brain
o ADD and ADHD
o Addiction
o Alzheimer's
o Anxiety
o Autism
o Depression
o Gender Difference
o Headaches
o Insomnia
o Intelligence
o Language Acquisition
o Parkinson's
o Perception
o Psychology
o Relationships
o Schizophrenia
o Social Psychology
o ... more topics
* Plants & Animals
o Agriculture and Food
o Animals
o Behavior
o Biology
o Biotechnology
o Cell Biology
o Cloning
o Developmental Biology
o Dogs
o Dolphins and Whales
o Endangered Animals
o Extinction
o Frogs and Reptiles
o Genetically Modified
o Marine Biology
o Microbes and More
o Nature
o New Species
o Pests and Parasites
o Spiders
o Zoology
o ... more topics
* Earth & Climate
o Air Quality
o Climate
o Coral Reefs
o Earthquakes
o Ecology
o Environmental Science
o Geography
o Geology
o Global Warming
o Hurricanes and Cyclones
o Ice Ages
o Oceanography
o Ozone Holes
o Pollution
o Renewable Energy
o Tsunamis
o Weather
o Wildfires
o ... more topics
* Space & Time
o Astronomy
o Astrophysics
o Big Bang
o Black Holes
o Dark Matter
o ESA
o Extrasolar Planets
o Mars
o Moon
o NASA
o Pluto
o Saturn
o Solar System
o Space Missions
o Space Station
o Space Telescopes
o Stars
o Sun
o ... more topics
* Matter & Energy
o Alternative Fuels
o Aviation
o Biochemistry
o Biometric
o Chemistry
o Detectors
o Electronics
o Energy Technology
o Forensics
o Fossil Fuels
o Inorganic Chemistry
o Nanotechnology
o Organic Chemistry
o Physics
o Quantum Physics
o Solar Energy
o Technology
o Wind Energy
o ... more topics
* Computers & Math
o Artificial Intelligence
o Communications
o Computer Graphics
o Computer Modeling
o Computer Science
o Encryption
o Hacking
o Mathematics
o Quantum Computers
o Robotics
o Software
o Statistics
o Video Games
o Virtual Reality
o ... more topics
* Fossils & Ruins
o Ancient Civilizations
o Anthropology
o Archaeology
o Dinosaurs
o Early Climate
o Early Humans
o Early Mammals
o Evolution
o Human Evolution
o Lost Treasures
o Origin of Life
o Paleontology
o Tyrannosaurus Rex
o ... more topics



* News
o Front Page
o Today's Summaries
o Latest Headlines
o Search Archives
o Email Newsletters
o RSS Newsfeeds
o News Sections
o Health & Medicine
o Mind & Brain
o Plants & Animals
o Space & Time
o Earth & Climate
o Matter & Energy
o Computers & Math
o Fossils & Ruins
* Articles
o Health & Medicine
o Mind & Brain
o Plants & Animals
o Space & Time
o Earth & Climate
o Matter & Energy
o Computers & Math
o Fossils & Ruins
* Videos
o Health & Medicine
o Mind & Brain
o Plants & Animals
o Space & Time
o Earth & Climate
o Matter & Energy
o Computers & Math
o Fossils & Ruins
* Images
o Health & Medicine
o Mind & Brain
o Plants & Animals
o Space & Time
o Earth & Climate
o Matter & Energy
o Computers & Math
o Fossils & Ruins
* Books
o Health & Medicine
o Mind & Brain
o Plants & Animals
o Space & Time
o Earth & Climate
o Matter & Energy
o Computers & Math
o Fossils & Ruins

Post this page to your favorite social bookmarking site:
close

* del.icio.us
* Digg
* Furl
* Netscape
* Yahoo! My Web
* StumbleUpon
* Google Bookmarks
* Technorati
* BlinkList
* Newsvine
* ma.gnolia
* reddit
* Facebook
* Tailrank
* Slashdot
* Fark

Include this item in your blog or web site:
close

* Title:
* Link:
* Summary:
* Click button to copy above text for pasting into your site:

Cite this article in your essay, paper, or report:
close

* APA style:
* MLA style:
* Click button to copy above text for pasting into your document:

Email this page's link to a friend or colleague:
close

* To Email:
* Your Name:
* Your Email:
* cc to self

Am vazut multe ceasuri superbe pe www.topceas.ro Am vazut multe ceasuri superbe pe www.topceas.ro Am vazut multe ceasuri superbe pe www.topceas.ro Am vazut multe ceasuri superbe pe www.topceas.ro Am vazut multe ceasuri superbe pe www.topceas.ro Am vazut multe ceasuri superbe pe www.topceas.ro Am vazut multe ceasuri superbe pe www.topceas.ro Am vazut multe ceasuri superbe pe www.topceas.ro Am vazut multe ceasuri superbe pe www.topceas.ro Am vazut multe ceasuri superbe pe www.topceas.roAm vazut multe ceasuri superbe pe www.topceas.ro
Am vazut multe ceasuri superbe pe www.topceas.ro
Am vazut multe ceasuri superbe pe www.topceas.roAm vazut multe ceasuri superbe pe www.topceas.roAm vazut multe ceasuri superbe pe www.topceas.roImi doresc un HTC MagicHTC Magic