Fierce Galactic Winds Escape Their Galaxies For Good
Fueled by an intense burst of star formation, fierce galactic winds may blow gas right out of massive galaxies, which in turn could shut down their ability to make new stars.
A team of astronomers sifted through images and data from three telescopes to find 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 Galaxy Evolution, 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.”
The observed galaxies are a few billion light years away and have outflowing winds of 500 to 2,500 kilometers per second. The researchers thought the winds might be coming from quasars, however, a closer look showed that these winds emanate from entire galaxies. These massive galaxies are in the midst of or just completing a period of star formation as intense as anyone has ever observed.
“These galactic-scale crazy-fast winds are probably driven by the really massive stars 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.”
These high wind galaxies are quite rare, leading to the researchers questioning whether these are unusual events or part of a common phase in the evolution of massive galaxies that scientists have missed because it is so brief.
Astrophysicists lack an explanation for how and why star making ends. Scientists who model the evolution of galaxies theorize supermassive black holes called active galactic nuclei, which can generate savage winds, explain how gas needed to form stars could be depleted.
These new observations demonstrate that black holes may not be necessary 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.”
Diamond-Stanic and colleagues published their findings in Astrophysical Journal Letters.
redOrbit.com
offers Science, Space, Technology, Health news, videos, images and
reference information. For the latest science news, space news,
technology news, health news visit redOrbit.com frequently. Learn
something new every day.”
2012-08-22 08:01:32
Source: http://www.redorbit.com/news/space/1112679703/galactic-winds-082212/
Source:
Anyone can join.
Anyone can contribute.
Anyone can become informed about their world.
"United We Stand" Click Here To Create Your Personal Citizen Journalist Account Today, Be Sure To Invite Your Friends.
Before It’s News® is a community of individuals who report on what’s going on around them, from all around the world. Anyone can join. Anyone can contribute. Anyone can become informed about their world. "United We Stand" Click Here To Create Your Personal Citizen Journalist Account Today, Be Sure To Invite Your Friends.
LION'S MANE PRODUCT
Try Our Lion’s Mane WHOLE MIND Nootropic Blend 60 Capsules
Mushrooms are having a moment. One fabulous fungus in particular, lion’s mane, may help improve memory, depression and anxiety symptoms. They are also an excellent source of nutrients that show promise as a therapy for dementia, and other neurodegenerative diseases. If you’re living with anxiety or depression, you may be curious about all the therapy options out there — including the natural ones.Our Lion’s Mane WHOLE MIND Nootropic Blend has been formulated to utilize the potency of Lion’s mane but also include the benefits of four other Highly Beneficial Mushrooms. Synergistically, they work together to Build your health through improving cognitive function and immunity regardless of your age. Our Nootropic not only improves your Cognitive Function and Activates your Immune System, but it benefits growth of Essential Gut Flora, further enhancing your Vitality.
Our Formula includes: Lion’s Mane Mushrooms which Increase Brain Power through nerve growth, lessen anxiety, reduce depression, and improve concentration. Its an excellent adaptogen, promotes sleep and improves immunity. Shiitake Mushrooms which Fight cancer cells and infectious disease, boost the immune system, promotes brain function, and serves as a source of B vitamins. Maitake Mushrooms which regulate blood sugar levels of diabetics, reduce hypertension and boosts the immune system. Reishi Mushrooms which Fight inflammation, liver disease, fatigue, tumor growth and cancer. They Improve skin disorders and soothes digestive problems, stomach ulcers and leaky gut syndrome. Chaga Mushrooms which have anti-aging effects, boost immune function, improve stamina and athletic performance, even act as a natural aphrodisiac, fighting diabetes and improving liver function. Try Our Lion’s Mane WHOLE MIND Nootropic Blend 60 Capsules Today. Be 100% Satisfied or Receive a Full Money Back Guarantee. Order Yours Today by Following This Link.
| Visits: | 1,708,017,101 |
| Stories: | 8,449,274 |
Whistler Blowers, Insiders
