Featured Research

from universities, journals, and other organizations

Astrophysicists Find Cause For Galactic Superbubble

Date:
July 29, 1999
Source:
University Of Toronto
Summary:
A gigantic empty void in our own galaxy was caused by a cluster of massive young stars at its centre, says an astrophysics professor at the University of Toronto.

A gigantic empty void in our own galaxy was caused by a cluster of massive young stars at its centre, says a professor of astrophysics at the University of Toronto.

The so-called "superbubble" in the W4 region in the Perseus spiral arm of the Milky Way galaxy was detected by Canadian astronomers working for the Canadian Galactic Plane Survey in Penticton, B.C. In the superbubble, which measures several 100 light years across, the interstellarmedium, the thin gas and dust that permeates the rest of space, is virtually absent. Professor Peter G. Martin says this is because a cluster of recently formed supergiant stars have pushed the interstellar material away from them with their stellar winds, the flow of particles that are shed by these hotly-burningultraluminous stars. In this case the cluster of stars created is so populous and yet so compact that it has created the largest void in the interstellar medium yet found.

"Around our sun, the stellar winds are fairly weak, but these stars are each 30 to 50 times more massive, and together they have blown all the gas and dust away, forming this cavity," Martin says.

Martin and his colleagues believe that as the galaxy continues to evolve, the stars within will become supernovae, turning the W4 superbubble into a "galactic fountain," a phenomenon more easily witnessed in other galaxies where the enriched, nuclear-processed matter ejected by thedying stars is dispersed widely over the rest of the galaxy. His analysis, coauthored with Shantanu Basu and Doug Johnstone, both research associates at the Canadian Institute of TheoreticalAstrophysics, appeared in the Astrophysical Journal.

CONTACT: Bruce Rolston
U of T Public Affairs
(416) 978-6974
bruce.rolston@utoronto.ca


Story Source:

The above story is based on materials provided by University Of Toronto. Note: Materials may be edited for content and length.


Cite This Page:

University Of Toronto. "Astrophysicists Find Cause For Galactic Superbubble." ScienceDaily. ScienceDaily, 29 July 1999. <www.sciencedaily.com/releases/1999/07/990727114944.htm>.
University Of Toronto. (1999, July 29). Astrophysicists Find Cause For Galactic Superbubble. ScienceDaily. Retrieved July 30, 2014 from www.sciencedaily.com/releases/1999/07/990727114944.htm
University Of Toronto. "Astrophysicists Find Cause For Galactic Superbubble." ScienceDaily. www.sciencedaily.com/releases/1999/07/990727114944.htm (accessed July 30, 2014).

Share This




More Space & Time News

Wednesday, July 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Supply Ship Takes Off for International Space Station

Supply Ship Takes Off for International Space Station

AFP (July 30, 2014) The European Space Agency's fifth Automated Transfer Vehicle (ATV-5) is takes off to the International Space Station on an Ariane 5 rocket from French Guiana. Duration: 00:34 Video provided by AFP
Powered by NewsLook.com
Raw: Rocket Launches Into Space With Cargo Ship

Raw: Rocket Launches Into Space With Cargo Ship

AP (July 30, 2014) Arianespace launched a rocket Tuesday from French Guiana carrying a robotic cargo ship to deliver provisions to the International Space Station. (July 30) Video provided by AP
Powered by NewsLook.com
In Virginia, the Rise of a New Space Coast

In Virginia, the Rise of a New Space Coast

AP (July 30, 2014) Every summer, tourists make the pilgrimage to Chincoteague Island, Va. to see wild ponies cross the Assateague Channel. But, it's the rockets sending to supplies to the International Space Station that are making this a year-round destination. (July 30) Video provided by AP
Powered by NewsLook.com
Russia Saves Gecko Sex Satellite, Media Has Some Fun With It

Russia Saves Gecko Sex Satellite, Media Has Some Fun With It

Newsy (July 27, 2014) The satellite is back under ground control after a tense few days, but with a gecko sex experiment on board, the media just couldn't help themselves. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins