New research by University of Utah astrophysicist Ben Bromley and his colleagues say there is strong evidence that super-massive black holes grow huge by repeatedly capturing one star from pairs of binary stars, while hurling the other binary partner into space at a hypervelocity of more than 1 million mph. This should be of particular interest to Siegfried! http://unews.utah.edu/news_releases/how-black-holes-grow/ -A
Thanks for posting that, Ann. I haven't had a chance to read it yet, but will during my upcoming 4-day weekend. :-) So, does this possibly contribute to the "MACHO" population, or is the theoretical number of rogue planets accompanied by their parent cast-off stars too low to be statistically meaningful to the whole "dark matter" question? C. On Tue, Apr 3, 2012 at 1:20 PM, Ann House <ann@annhouse.org> wrote:
New research by University of Utah astrophysicist Ben Bromley and his colleagues say there is strong evidence that super-massive black holes grow huge by repeatedly capturing one star from pairs of binary stars, while hurling the other binary partner into space at a hypervelocity of more than 1 million mph. This should be of particular interest to Siegfried!
Are Black Holes "Dark Matter"? Did not the Accelerating Universe raise some questions about how much dark matter there may be?
This discovery or theory only explains how Black Holes grow in mass rapidly. Thanks for posting that, Ann. I haven't had a chance to read it yet, but
will during my upcoming 4-day weekend. :-)
So, does this possibly contribute to the "MACHO" population, or is the theoretical number of rogue planets accompanied by their parent cast-off stars too low to be statistically meaningful to the whole "dark matter" question?
C.
On Tue, Apr 3, 2012 at 1:20 PM, Ann House <ann@annhouse.org> wrote:
New research by University of Utah astrophysicist Ben Bromley and his colleagues say there is strong evidence that super-massive black holes grow huge by repeatedly capturing one star from pairs of binary stars, while hurling the other binary partner into space at a hypervelocity of more than 1 million mph. This should be of particular interest to Siegfried!
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On Wed, Apr 4, 2012 at 9:33 AM, <erikhansen@thebluezone.net> wrote:
Are Black Holes "Dark Matter"? Did not the Accelerating Universe raise some questions about how much dark matter there may be?
This discovery or theory only explains how Black Holes grow in mass rapidly.
I was extrapolating beyond the accretion issue, Erik. Think about it. If a supermassive black hole has swallowed a few million stars during it's lifetime, there must be millions of others that have been ejected from the host galaxy at hypervelocity as a result (along with any close-orbiting planets they may have had). There's still some feeling that a lot of the dark matter may just be ordinary intergalactic dwarf stars and planets, too dim to be detected- yet. The MACHO microlensing surveys haven't turned up the numbers expected, but again, that may be a shortcoming of the available technology rather than a meaningful statistic. And speaking of black holes (or their alternative), has anybody heard of any more theoretical work on modeling gravastars in the last few years?
BTW, here's some info on Gravastars: http://en.wikipedia.org/wiki/Gravastar If you have the time, I highly recommend looking up the papers of the scientists who are behind the concept. I've read a few, and although much of the math is beyond my time constraints (and ability, lol!), the abstracts and verbage are incredibly interesting. I for one am hoping that these animals exist. Still much theoretical work to do, not to mention observational data to be taken, even though it could be generations before we can even hope to start taking data. It's noteworthy that the existence of gravastars does not exclude the existence of the classical black hole, in all it's mass manifestations. I love it when theoretical physicists think outside of the box. It's what they get paid for.
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Ann House -
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erikhansen＠thebluezone.net