Milky Way’s smallest black holes ‘don’t exist’
November 22nd, 2010 - 3:49 pm ICT by ANILondon, Nov 22 (ANI): A new study has revealed that black holes a few times the mass of the sun may not exist to begin with.
Stars that are eight or more times the mass of the sun explode as supernovae at the end of their lives. If the core left behind weighs less than two or three suns, it will turn into a neutron star. If it weighs more, it will become a black hole.
But there is a glaring lack of black holes observed at the lightest end of the spectrum, said Feryal Ozel of the University of Arizona in Tucson, reports New Scientist.
Ozel and colleagues studied 16 systems in the Milky Way that contain a black hole and a stellar partner, and found that none of these black holes had a mass between two and five times that of the sun.
This can’t be explained by simple observational constraints, said the team.
“These black holes really seem not to exist,” said Ozel.
If the results are confirmed, they could give new insights into how stars collapse and explode, said Chris Fryer of the Los Alamos National Laboratory in New Mexico.
Larger stars are thought to explode with less energy than smaller ones, said Fryer. That means lower-mass stars that go on to form neutron stars would blast more of their outer layers away than higher-mass stars that become black holes.
The extra material the higher-mass stars hold onto could then fall into the black holes, bulking them up. This could explain the dearth of the puniest black holes, he said.
The findings would appear in the Astrophysical Journal. (ANI)
- 'Magnetar' discovery challenges stellar evolution, black hole theory - Aug 19, 2010
- NASA finds 30-yr-old 'youngest' nearby black hole - Nov 16, 2010
- Astronomers stumble on massive black holes - Dec 07, 2011
- Supercomputer solves gamma-ray burst mystery - Apr 08, 2011
- NASA's Chandra X-ray Observatory finds youngest nearby black hole - Nov 16, 2010
- Study predicts occurrence of neutron star collision in local galaxies - Dec 03, 2010
- Dying star coughs out dust cloud` - Jan 17, 2011
- NASA finds giant ring of black holes - Feb 10, 2011
- Superfluid found in neutron star's core - Feb 24, 2011
- Does galaxy hold thousands of ticking 'time bombs'? - Sep 07, 2011
- Earth may witness second sun if Betelgeuse star in Orion nebula explodes - Jan 19, 2011
- Chandra images show result of star formation on overdrive - Jan 14, 2011
- Astronomers detect black hole farther away than any other previously known - Jan 27, 2010
- Why massive stellar explosions occur in the tiniest of galaxies? - Apr 22, 2011
- Black holes gobble up stars to grow bigger - Apr 03, 2012
Tags: alamos national laboratory, astrophysical journal, black hole, black holes, dearth, fryer, glaring lack, los alamos national laboratory, mass of the sun, mass stars, milky way, neutron star, neutron stars, new insights, new scientist, observational constraints, outer layers, ozel, supernovae, three suns