Intense bursts of star formation drive fierce galactic winds

Aug 21, 2012
Matter blasts out of the starburst galaxy M82 in this composite image from three observatories. Credit: Smithsonian Institution/Chandra X-ray Observatory

(Phys.org) -- Fierce galactic winds powered by an intense burst of star formation may blow gas right out of massive galaxies, shutting down their ability to make new stars.

Sifting through images and data from three telescopes, a team of astronomers found 29 objects with outflowing winds measuring up to 2,500 kilometers per second, an order of magnitude faster than most observed galactic winds.

"They're nearly blowing themselves apart," said Aleksandar Diamond-Stanic, a fellow at the University of California's Southern California Center for , who led the study. "Most galactic winds are more like fountains; the outflowing gas will fall back onto the galaxies. With the high-velocity winds we've observed the outflowing gas will escape the galaxy and never return." Diamond-Stanic and colleagues published their findings in .

The galaxies they observed are a few billion away with outflowing winds of 500 to 2,500 kilometers per second. Initially they thought the winds might be coming from , but a closer look revealed these winds emanate from entire galaxies.

Young, bright and compact, these are in the midst of or just completing a period of as intense as anyone has ever observed.

"These galactic-scale crazy-fast winds are probably driven by the really exploding and pushing out the gas around them," said Alison Coil, professor in UC San Diego's Center for Astrophysics and Space Sciences and a co-author of the paper. "There's just such a high density of those stars it's like all these bombs went off near each other at the same time. Each bomb evacuates the area around it, then the next can push gas out further until they're evacuating gas on the scale of the whole galaxy."

Galaxies with winds this fast are also quite rare, opening up the question of whether these are unusual events or part of a common phase in the evolution of massive galaxies that is seldom observed because it is so brief.

Astrophysicists still lack an explanation for how and why starmaking ends. Theorists who model the evolution of galaxies often invoke supermassive black holes called active galactic nuclei, which can also generate savage winds, to explain how gas needed to form stars can be depleted.

These new observations demonstrate that black holes may not be neccesary to account for how these kinds galaxies run out of gas. "The winds seem to be powered by the starburst," Diamond-Stanic said. "The central supermassive black hole is apparently just a spectator for these massive stellar fireworks."

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User comments : 11

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Tuxford
1 / 5 (8) Aug 21, 2012
"The central supermassive black hole is apparently just a spectator for these massive stellar fireworks."

The central core star is the cause, not a spectator. Don't believe it because you are a relativist evangelist? Oh well. Cling to your fantasy. It sure is a sexy dream. Some are coming waking up. But most prefer the dream....

http://phys.org/n...ill.html

See my links under this story.

http://phys.org/n...ies.html

Or just close your eyes, and dream....
yyz
4.6 / 5 (9) Aug 21, 2012
"The central core star is the cause, not a spectator. Don't believe it because you are a relativist evangelist?"

I don't believe it because *observations* say otherwise:

http://articles.a...ype=.pdf

http://xxx.lanl.g...16v2.pdf

http://articles.a...ype=.pdf

http://iopscience..._772.pdf

Of course you are free to ignore observations and believe anything you want.
jsdarkdestruction
4.3 / 5 (8) Aug 21, 2012
we've been through this before tuxford. im not going to show mercy when you attack science as "dreamers".everytime you bring up this crap im going to call it out. Why not Say WHERE and HOW your idol laviolette got these ideas?
here are some paraphrases of works from tuxfords idol laviolette, it illustrates how based in reality his worldview really is.this is from a book he wrote."First time proof of the existence of interstellar radio signals of intelligent origin being sent to us.Evidence that pulsars are part of a vast network of ETI communication beacons.This exhaustive study presents first time proof that astronomers have been receiving radio signals of intelligent origin. As early as 1967 and continuing to the present, radio astronomers have been carefully studying and cataloging unusual interstellar beacons called pulsars thinking them to be stars of natural origin.Dr. LaViolette, who has been researching pulsars for 27 years, shows that, up to now, the nature of these radio....
jsdarkdestruction
4 / 5 (6) Aug 21, 2012
sources has been grossly misunderstood. He has discovered that a number of very unique pulsars are nonrandomly distributed in the sky and mark key Galactic locatations that have particular significance from an ETI communication standpoint. He also presents evidence of unusual geometric alignments among pulsars and intriguing pulse period relationships. Equally compelling is the message they are sending-a warning about a past Galactic core explosion disaster that should help us avert a future global tragedy. Contains extensive analysis of pulsar data, revealing new ideas about the origins and functions of pulsars Provides proof of an extraterrestrial communication network Includes information about the formation of crop circles and force-field-beaming technolgy."

hmmmm, crop circles, force field beaming, et communication codes hidden in the stars revealing this all to laviolette......SCIENCE FICTION IS WHAT LAVIOLETTE IS TUXFORD!!! GIVE IT A BREAK ALREADY!
Tuxford
1 / 5 (8) Aug 21, 2012
You guys are desperate. Dark always responds with several lengthy slanderous efforts, even to my most minor post. Why so much effort Dark, if this is all nonsense???

We know you don't believe anything other than the accepted propaganda. Are you bored, or greatly concerned some minds might soon question the long-established framework? I ignore you. Why don't you ignore me???

Don't look at this!

http://phys.org/n...arp.html
jsdarkdestruction
5 / 5 (6) Aug 21, 2012
because you spread nonsense. i wont let you pollute this site with science fiction based fantasies made to sell books to the gullible. that part of only accepting certain theories is horseshit. i love alternative theories and look at them often to see if any have any merit. guess what, yours doesnt....i follow evidence, not predetermined beliefs like you.
ValeriaT
1 / 5 (3) Aug 21, 2012
Actually, instead of LaViolette I'm rather missing the Plasma Universe guy here. The galactic wind is the rational point of Alfven theories.
Tuxford
1 / 5 (6) Aug 21, 2012
I am waiting for @Dark to self-destruct..... Remember the Law of Karma.....@Dark. Even you cannot escape the Karmic event horizon! So be careful in your rants.... Better just to go hide in your dark intellectual closet. You will be safer hiding in the dark from new threatening ideas. Protect your fragile rationale mind.... Clearly you feel afraid.
jsdarkdestruction
4 / 5 (4) Aug 21, 2012
if you are so sure of laviolettes theory why dont you say something like "It's is believed by paul laviolette that *whatever*, who came upon this information in secret codes hidden in pulsar neutron stars from an advanced et civilization that has no actual scienctific evidence that supports his theories other than the codes. he also believes in crop circles and force field beaming and matter being created from nothing and secret anti gravity technology being used in secret aircraft."
why dont you tell then everything? only showing the parts you like is cherry picking bullshit and is weak and a show of desperation to deny the reality that you got taken in by a science fiction writer.
cantdrive85
1 / 5 (3) Aug 22, 2012
"The galactic wind is the rational point of Alfven theories."

It's been shown in a lab that electric currents create wind, why should it be any different in the Universe? Especially considering the relativistic speeds involved.
HannesAlfven
1 / 5 (4) Aug 22, 2012
Re: "It's been shown in a lab that electric currents create wind, why should it be any different in the Universe? Especially considering the relativistic speeds involved."

Black holes are just so much more sexy than electric fields ...

From the article: "There's just such a high density of those stars it's like all these bombs went off near each other at the same time."

Yes, it's almost as if our observation that stars form like beads along a string might be suggesting to us that there is one single electrical current -- the one that connects them -- forming all of the stars at once.

I know that a lot of conventional thinkers don't even blink when theorists claim that they can't get a simulation to produce their desired results, but it's not for lack of trying, and when there is a physical reason obstructing success, this speaks more about the IDEA than the attempts at simulation.

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