Weekly News via Email
   Set as homepage | Add to favorites | Customer Service | Subscribe Now | Place an Ad | Contact Us | Sitemap Thursday, 09.18.2014
Classifieds
News Archive
Su Mo Tu We Th Fr Sa
 1  2
 3  4  5  6  7  8  9
 10  11  12  13  14  15  16
 17  18  19  20  21  22  23
 24  25  26  27  28  29  30
Online Extras
Site Services
Around Bend
Outdoor Fun
Travel Info
Shop Local




Members Of



Poll: Today's Live Poll
Email to a friend | Print this | PDF version | Comments (0 posted) 
  Blogger |   del.icio.us |   digg |   newsvine

Jun 01,2007
Monster black holes, quietly cruising the cosmos?
by Bend Weekly News Sources

Two merg­ing black holes can gen­er­ate a re­coil so pow­er­ful, the merged hole shoots out of its host gal­axy at up to 2,500 miles per sec­ond, ac­cord­ing to a new com­put­er sim­ula­t­ion.

Its cre­ators said the work shows for the first time that these vi­o­lent events, which fol­low merg­ers of ga­lax­ies con­tain­ing black holes, can to­tally eject the black holes. So these ti­ta­nic ob­jects may be cruis­ing through the un­iverse, vir­tu­ally in­vis­i­ble un­less they should crash in­to some­thing. 

But don’t wor­ry, as­tro­no­mers said. Most of the un­iverse by far is emp­ty space. The odds that a black hole will streak through our so­lar sys­tem are ti­ny.

Black holes are ex­tremely com­pact ob­jects that con­tain so much mat­ter crammed in­to so small a space that their gra­vity be­comes over­pow­ering and sucks in eve­ry­thing near­by, in­clud­ing light. De­spite their light-eating tal­ents, many black holes are as­sociat­ed with in­tense light emis­sions, be­cause the in falling ob­jects heat up and shine. But a black hole with noth­ing to feed on, called a “qui­es­cent” black hole, is dark.

Most lu­mi­nous ga­lax­ies are believed to con­tain a gi­ant, or super massive, black hole at their cen­ter. The sim­ula­t­ion, led by Manuela Cam­pan­elli at the Roch­es­ter In­sti­tute of Tech­nol­o­gy, N.Y., stud­ied the best con­di­tions for mer­gers to pro­duce re­coil speeds high enough to free a super massive black hole from its host gal­axy. 

The re­coil would re­sult when, up­on crash­ing, the black holes cre­ate an ex­ot­ic type of radia­t­ion called gravita­t­ional waves. In Cam­pan­elli’s sce­nar­i­o, two black holes ap­proach and start to or­bit each oth­er. To pro­duce to­tal ejection, they should have equal mass­es and spin as fast as pos­si­ble. They must be tilted with their ax­es of rota­t­ion ly­ing in the plane of their or­bit, and must spin in op­po­site di­rec­tions. 

They spir­al to­ward one anoth­er, and when they merge, the re­sulting ob­ject is kicked off pe­rpendicularly to the plane of or­bit. Some as­t­ro­phys­i­cists have ar­gued that such con­di­tions are rath­er un­like­ly; sci­en­tists said the prob­a­bil­ity of such a con­flu­ence of events re­mains a ques­tion for fu­ture re­search.

Past cal­cula­t­ions have found that black hole ejections may not be un­com­mon. But the ex­pelled black hole can easily fall back in­to the gal­axy due to con­tin­u­ing gravita­t­ional at­trac­tion be­tween the two, just as a can­non­ball shot to the sky re­turns to the ground.

A sec­ond new stu­dy, by Abra­ham Loeb of Har­vard Un­ivers­ity in Cam­bridge, Mass., ex­am­ined the pos­si­bil­ity of de­tect­ing a black hole if it is ex­pelled. If it’s sur­rounded by gas, he said, that gas will emit pow­er­ful light. Un­for­tu­nate­ly, by the time it leaves the gal­axy, it will likely ex­haust its gas supply and go dark.

None­the­less, one vis­i­ble ob­ject known as HE0450-2958, es­ti­mat­ed to lie more than three bil­lion light-years away, is the­o­rized by some to be an ejected super massive black hole. One of the re­search­ers who ad­vanced the pro­pos­al has said this black hole may be one of those that one day re­turns to its home gal­axy. It’s es­ti­mat­ed to have been mov­ing much more slowly on av­er­age than the fully-e­jected mono­liths that Cam­pan­elli stud­ied, en­hanc­ing the like­li­hood of an even­tu­al fall­back.

Loe­b’s and Cam­pan­elli’s stud­ies are to ap­pear in forth­com­ing is­sues of the re­search jour­nal Phys­i­cal Re­view Let­ters.

 

 

 

 

Courtesy American Physical Society and World Science staff

1342 times read

Related news
Galaxy seen blasting its neighbor by Bend_Weekly_News_Sources posted on Jan 04,2008

'Dark matter' doubters not silenced yet by Bend_Weekly_News_Sources posted on Aug 03,2007

First stars may have been supergiants, researchers say by World-Science.net posted on Jan 05,2007

Milky Way’s black hole seen as particle smasher by Bend_Weekly_News_Sources posted on Mar 09,2007

Paper takes swipe at bedrock law of physics by World-Science.net posted on Feb 16,2007

Did you enjoy this article? Rating: 4.80Rating: 4.80Rating: 4.80Rating: 4.80Rating: 4.80 (total 10 votes)

Market Information
Breaking News
Most Popular
Most Commented
Featured Columnist
Horoscope Guide
Aquarius Aquarius Libra Libra
Aries Aries Pisces Pisces
Cancer Cancer Sagittarius Sagittarius
Capricorn Capricorn Scorpio Scorpio
Gemini Gemini Taurus Taurus
Leo Leo Virgo Virgo
Local Attractions
Bend Visitors & Convention Bureau
Bend Visitors & Convention Bureau

Mt. Bachelor Resort
Mt. Bachelor Resort

Les Schwab Ampitheater
Les Schwab Ampitheater

Deschutes County Fairgrounds
Deschutes County
Fairgrounds

Tower Theatre
Tower Theatre

The High Desert Museum

Advertisements



Deschutes County

Google  
  Web    BendWeekly.com
© 2006 Bend Weekly News
A .Com Endeavors, Inc. Company.
All Rights Reserved. Terms under
which this service is provided to you.
Please read our Privacy Policy. Contact us.
Bend Weekly News & Event Guide Online
   Save the Net
Advertisement
External sites open in new window,
not endorsed by BendWeekly.com
Subscribe in NewsGator Online
Add to Google Add to MSN Add to My AOL
What are RSS headlines?