MessageToEagle.com

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

31 August, 2012

Share this story:
Follow us:

MessageToEagle.com - Beautiful and mysterious structures known as superbubbles result from the stellar winds and supernovae of OB [spectral types O or early-type B] associations.

Astronomers believe they play play a fundamental role in the structure and energetics of the ISM [interstellar medium] in star-forming galaxies.

Their influence may also dominate the relationship between the different interstellar gas phases.

How do superbubbles form and evolve?
How do they affect the local and global ISM?

The Magellanic Clouds provide a superior opportunity to study this shell-forming activity, since both stellar content and gaseous structure can be examined in detail.

A superbubble in the Large Magellanic Cloud (LMC) was observed by astronomers using Chandra X-ray Observatory.

LMC is a small satellite galaxy of the Milky Way, located about 160,000 light years from Earth.

Many new stars, some of them very massive, are forming in the star cluster NGC 1929, which is embedded in the nebula N44.

The massive stars produce intense radiation, expel matter at high speeds, and race through their evolution to explode as supernovas.

The winds and supernova shock waves carve out huge cavities called superbubbles in the surrounding gas. X-rays from NASA's Chandra X-ray Observatory (blue) show hot regions created by these winds and shocks, while infrared data from NASA's Spitzer Space Telescope (red) outline where the dust and cooler gas are found.

The optical light from the 2.2m Max-Planck-ESO telescope (yellow) in Chile shows where ultraviolet radiation from hot, young stars is causing gas in the nebula to glow.

A long-running problem in high-energy astrophysics has been that some superbubbles in the LMC, including N44, give off a lot more X-rays than expected from models of their structure.



A Chandra study published in 2011 showed that there are two extra sources of the bright X-ray emission: supernova shock waves striking the walls of the cavities, and hot material evaporating from the cavity walls.

The observations show no evidence for an enhancement of elements heavier than hydrogen and helium in the cavities, thus ruling out this possibility as an explanation for the bright X-ray emission.




Click on image to enlarge

NGC 1929 is a star cluster embedded in the N44 nebula, which is found in the Large Magellanic Cloud. Massive stars in the cluster produce intense radiation, expel matter at high speeds, and explode relatively quickly as supernovas.
Winds from the massive stars and shocks from the supernovas carve out "superbubbles" in the gas seen in X-rays by Chandra (blue). Infrared data show dust (red) and cooler gas and optical light (yellow) reveals where ultraviolet radiation is causing the gas to glow. Credits: X-ray: NASA/CXC/U.Mich./S.Oey, IR: NASA/JPL, Optical: ESO/WFI/2.2-m


This is the first time that the data have been good enough to distinguish between different sources of the X-rays produced by superbubbles.

The Chandra study of N44 and another superbubble in the LMC was led by Anne Jaskot from the University of Michigan in Ann Arbor. The co-authors were Dave Strickland from Johns Hopkins University in Baltimore, MD, Sally Oey from University of Michigan, You-Hua Chu from University of Illinois and Guillermo Garcia-Segura from Instituto de Astronomia-UNAM in Ensenada, Mexico.

MessageToEagle.com

See also:
10 Spectacular Hubble Space Telescope Images Never Released Before

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:

Physicists Challenge Validity Of Big Bang Theory
We all know that the Big Bang theory is an effort to explain what happened at the very beginning of our universe. However, Australian team of theoretical physicists at the University of Melbourne and RMIT University say that it's time to change our understanding of this process.


Extinguish Fires With Sound! Incredible New Invention From DARPA

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:


Sloan Digital Sky Survey III Presents: New 3-D Map Of The Sky!

Doomed Moons Of Uranus: Cupid And Belinda Are On Collision Course

Two Veteran Voyager Spacecraft Will Cross Into Interstellar Space - "It's Just A Question Of When"

100 Years Of Cosmic Rays Mystery - Physicists Gradually Reveal The Nature Of The Objects

Tranquil Galaxy NGC 1187 Home To Violent Events

First X-Rays From The Remains Of A Supernova Observed Over 50 Years Ago

Voyager at 35 - Break On Through To the Space Between Stars
Exactly thirty-five years ago, NASA's Voyager 2 spacecraft, the first Voyager spacecraft to launch, departed on a journey that would make it the only spacecraft to visit Uranus and Neptune and the longest-operating NASA spacecraft ever...

WiggleZ Confirms The Big Picture Of The Universe
The current model is based on Einstein's equations assuming everything is smooth on the largest scales. If matter were instead clumpy on very large scales, then the entire model would need to be rethought.

Milky Way Locked In A Complex Cosmic Dance With Its Twin Galaxies - New Rare Discovery
A group of astronomers made a rare and fascinating discovery, searching for groups of galaxies similar to ours in the most detailed map of the local Universe yet. The Milky Way is a fairly typical galaxy on its own, but when paired with its close neighbours...

There Is Sugar In That Star! Life Building Blocks Discovered Around A Sun-Like Star
Astronomers' observations reveal that the sugar molecules are falling in towards one of the stars of the system. The sugar molecules are not only in the right place to find their way onto a planet, but they are also going in the right direction...

First Planetary System Orbiting Two Suns Found By Kepler
The system, known as a circumbinary planetary system, is 4,900 light-years from Earth in the constellation Cygnus. Coming less than a year after the announcement of the first circumbinary planet, Kepler-16b...

W3Counter