Astronomers Just Found Some of The Most Massive Black Holes Discovered in Our Universe
A study on dozens of galaxies within several billion light years of our own has revealed black holes that far exceed our expectations on just how big these monsters can grow.
more…
They don’t come much bigger; the current record-holder comes in at around 17 billion Suns, though other studies hint at a 40 billion solar mass behemoth 12.1 billion light years away.
How wide is 17 billions suns?
Tau.Neutrino said:
They don’t come much bigger; the current record-holder comes in at around 17 billion Suns, though other studies hint at a 40 billion solar mass behemoth 12.1 billion light years away.How wide is 17 billions suns?
Rs = 2MG/c2
Rs is the Schwazschild radius
M = Mass
G = Gravitational Constant
c = speed of light.
JudgeMental said:
Tau.Neutrino said:
They don’t come much bigger; the current record-holder comes in at around 17 billion Suns, though other studies hint at a 40 billion solar mass behemoth 12.1 billion light years away.How wide is 17 billions suns?
Rs = 2MG/c2
Rs is the Schwazschild radius
M = Mass
G = Gravitational Constant
c = speed of light.
How do I put them into my calculator?
http://eguruchela.com/physics/calculator/Black-Hole-Schwarzschild-Radius-Calculator.php
https://physics.stackexchange.com/questions/92990/finding-the-schwarzchild-radius-of-a-star-of-solar-mass-30
http://www.wolframalpha.com/widgets/view.jsp?id=15c7a7eb32c8610b005811b8640ebc1
put 40 billion solar mass, or 17 billion solar mass, in the place of earth. click submit.
JudgeMental said:
http://www.wolframalpha.com/widgets/view.jsp?id=15c7a7eb32c8610b005811b8640ebc1put 40 billion solar mass, or 17 billion solar mass, in the place of earth. click submit.
335.6 AU
and 40 is 789.6 AU
> To estimate the size of the black holes themselves, they analysed the spectrum of X-rays being spat out by the whirling disc of heated gas being sucked into their crazy gravity wells. The researchers then correlated this figure with the overall luminosity of the surrounding galaxy. It makes sense that the bigger the galaxy, the bigger the black hole – but this relationship isn’t quite as simple as they’d thought. We have discovered black holes that are far larger and way more massive than anticipated.
How reliable is the correlation between X ray spectrum and black hole size?
mollwollfumble said:
> To estimate the size of the black holes themselves, they analysed the spectrum of X-rays being spat out by the whirling disc of heated gas being sucked into their crazy gravity wells. The researchers then correlated this figure with the overall luminosity of the surrounding galaxy. It makes sense that the bigger the galaxy, the bigger the black hole – but this relationship isn’t quite as simple as they’d thought. We have discovered black holes that are far larger and way more massive than anticipated.How reliable is the correlation between X ray spectrum and black hole size?
> We perform a detailed study of the location of brightest cluster galaxies (BCGs) on the Fundamental Plane of black hole (BH) accretion, which is an empirical correlation between a BH X-ray and radio luminosity and mass supported by theoretical models of accretion. The sample comprises 72 BCGs out to z ∼ 0.3 and with reliable nuclear X-ray and radio luminosities. These are found to correlate as
LX∝L0.75±0.08R, favouring an advection-dominated accretion flow as the origin of the X-ray emission. BCGs are found to be on average offset from the Fundamental Plane such that their BH masses seem to be underestimated by the MBH–MK relation a factor ∼10.
This is what starts the abstract, so it seems as if the uncertainty in the relationship between X ray spectrum and black hole mass is uppermost in their minds as well. A black hole mass error by about a factor of 10 allows the possibility that empirical extrapolation to larger black holes is in error by much more than this factor.