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Milky Way Houses Up To 100 Million Black Holes
Posted on 8/9/17 at 8:48 pm
Posted on 8/9/17 at 8:48 pm
LINK
Thanks to a comprehensive study by a trio of researchers from UC Irvine, the first accurate estimates of the number of black holes found in Milky Way-like galaxy have now been made. Not only is our galaxy filled with hundreds of billions of stars, but we also are home to up to 100 million black holes.
...
Prior to LIGO, it wasn't expected that black holes of ~30 solar masses would inspiral and merge into one another, yet LIGO has taught us that these mergers are likely ubiquitous. With so many black holes predicted by this latest work, it tells us that what LIGO's seen so far likely isn't particularly special or out-of-the-ordinary. Coauthor Manoj Kaplinghat noted that, with so many black holes, only a small fraction need to be in merger-ready orbits to explain the LIGO signals. "We show that only 0.1 to 1 percent of the black holes formed have to merge to explain what LIGO saw," Kaplinghat said.
Holy crap, that's only our galaxy.
Thanks to a comprehensive study by a trio of researchers from UC Irvine, the first accurate estimates of the number of black holes found in Milky Way-like galaxy have now been made. Not only is our galaxy filled with hundreds of billions of stars, but we also are home to up to 100 million black holes.
...
Prior to LIGO, it wasn't expected that black holes of ~30 solar masses would inspiral and merge into one another, yet LIGO has taught us that these mergers are likely ubiquitous. With so many black holes predicted by this latest work, it tells us that what LIGO's seen so far likely isn't particularly special or out-of-the-ordinary. Coauthor Manoj Kaplinghat noted that, with so many black holes, only a small fraction need to be in merger-ready orbits to explain the LIGO signals. "We show that only 0.1 to 1 percent of the black holes formed have to merge to explain what LIGO saw," Kaplinghat said.
Holy crap, that's only our galaxy.
13
Posted on 8/9/17 at 8:48 pm to DavidTheGnome
how many are in NBR?
Posted on 8/9/17 at 8:49 pm to DavidTheGnome
Racist?
Posted on 8/9/17 at 8:49 pm to Kafka
Tree fiddy
Posted on 8/9/17 at 8:49 pm to DavidTheGnome
I'm a Snickers man, myself
Posted on 8/9/17 at 8:59 pm to DavidTheGnome
quote:
accurate estimates
AKA "we pulled yet another number directly out our asses"
Posted on 8/9/17 at 9:00 pm to DavidTheGnome
Einstein was talking about the theoretics of LIGO 100 years ago.
Posted on 8/9/17 at 9:02 pm to shawnlsu
How they determined:
We present an empirical approach for interpreting gravitational wave signals of binary black hole mergers under the assumption that the underlying black hole population is sourced by remnants of stellar evolution. Using the observed relationship between galaxy mass and stellar metallicity, we predict the black hole count as a function of galaxy stellar mass. We show, for example, that a galaxy like the Milky Way should host millions of ~30~M? black holes and dwarf satellite galaxies like Draco should host ~100 such remnants
..
From article:
It stands to reason, then, if we can figure out how galaxies formed, grew, and created stars over their history, we can run simulations that can tell us approximately how many black holes should exist in a galaxy of any size and merger history. That's precisely what the work of Oliver D. Elbert, James S. Bullock, and Manoj Kaplinghat has recently attempted to do. What they found is that there are three questions you need to know the answer to in order to come up with an estimate for black holes:
What is the total mass of the galaxy?
What is the total mass-in-stars of the galaxy?
And what is the metallicity of the galaxy? (i.e., what percent of the galaxy's mass is elements heavier than hydrogen and helium?)
If you can observe and/or reconstruct these three properties, you can pick out not only how many black holes are inside, but what the typical masses of those black holes are.
We present an empirical approach for interpreting gravitational wave signals of binary black hole mergers under the assumption that the underlying black hole population is sourced by remnants of stellar evolution. Using the observed relationship between galaxy mass and stellar metallicity, we predict the black hole count as a function of galaxy stellar mass. We show, for example, that a galaxy like the Milky Way should host millions of ~30~M? black holes and dwarf satellite galaxies like Draco should host ~100 such remnants
..
From article:
It stands to reason, then, if we can figure out how galaxies formed, grew, and created stars over their history, we can run simulations that can tell us approximately how many black holes should exist in a galaxy of any size and merger history. That's precisely what the work of Oliver D. Elbert, James S. Bullock, and Manoj Kaplinghat has recently attempted to do. What they found is that there are three questions you need to know the answer to in order to come up with an estimate for black holes:
What is the total mass of the galaxy?
What is the total mass-in-stars of the galaxy?
And what is the metallicity of the galaxy? (i.e., what percent of the galaxy's mass is elements heavier than hydrogen and helium?)
If you can observe and/or reconstruct these three properties, you can pick out not only how many black holes are inside, but what the typical masses of those black holes are.
This post was edited on 8/9/17 at 9:09 pm
Posted on 8/9/17 at 9:04 pm to DavidTheGnome
quote:
We present an empirical approach for interpreting gravitational wave signals of binary black hole mergers under the assumption that the underlying black hole population is sourced by remnants of stellar evolution. Using the observed relationship between galaxy mass and stellar metallicity, we predict the black hole count as a function of galaxy stellar mass.
Well, yeah...obviously
Posted on 8/9/17 at 9:04 pm to DavidTheGnome
Dude, he can't comprehend that type of speak or numbers calculation.
Posted on 8/9/17 at 9:05 pm to DavidTheGnome
Who gives a shite if we aren't even gonna field a Top 5 recruiting class this yr
Posted on 8/9/17 at 9:05 pm to DavidTheGnome
And water is wet, so what?
Posted on 8/9/17 at 9:09 pm to LeClerc
A better understanding of how the Universe evolves?
Posted on 8/9/17 at 9:09 pm to DavidTheGnome
I wonder which one Maximilian is in?
Posted on 8/9/17 at 9:09 pm to DavidTheGnome
I'm just looking for 1 to check off a bucket list
Posted on 8/9/17 at 9:12 pm to List Eater
You'd be an OT .0000000000001 to them if it ever happened.
Akin to human fricking a snail.
Akin to human fricking a snail.
Posted on 8/9/17 at 9:15 pm to DavidTheGnome
And there are countless of galaxies making up super clusters. The amount of matter is almost hard to imagine.
Posted on 8/9/17 at 9:16 pm to AUCE05
quote:
The amount of matter is almost hard to imagine.
And that's only a relatively small part of it (much more dark matter)
This post was edited on 8/9/17 at 9:18 pm
Posted on 8/9/17 at 9:18 pm to DavidTheGnome
If we can get that dark gravity down, we'll be alright
Posted on 8/9/17 at 9:22 pm to DavidTheGnome
Space is so mind boggling.
Read this thread, then go read the thread about 8-5 baws daily routines.
It makes you think, why the frick are we wasting our time with this dumb bullshite we do day to day when we aren't even a spec on the map? What a waste of time.
Reading about space is therapeutic for me. Reminds me how little we matter.
Read this thread, then go read the thread about 8-5 baws daily routines.
It makes you think, why the frick are we wasting our time with this dumb bullshite we do day to day when we aren't even a spec on the map? What a waste of time.
Reading about space is therapeutic for me. Reminds me how little we matter.
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