It should be great chance to see if there are any second and higher
order distortion in black hole collisions. We don't have exact
solutions describing black hole mergers, so we know they quickly settle
down to simple ellipsoids (the no-hair theorem) but I would be good to
know our approximate solutions haven't thrown away some short wave ripples.
Brent
On 9/3/2022 7:19 AM, John Clark wrote:
A prediction has been made that 2 supermassive black holes in a galaxy
1.1 billion light years away will collide within the next 3 years. The
galaxy has a core that is extremely bright in optical, ultraviolet and
x-rays and the interesting thing is the intensity of the radiation
fluctuates and the period of the fluctuations has been shortening,
just three years ago the fluctuation was about one year long but today
it's only about one month. There could be several reasons for this but
the most obvious one is that 2 supermassive black holes, each with
about 100,000,000 solar masses, had an orbital period of one year back
in 2019 but an orbital period of only one month today; if that is
indeed the case then they are orbiting faster and faster and thus
getting closer and closer together and should collide sometime within
the next 3 years, perhaps even this year. Such a collision would
produce enormously powerful gravitational waves but LIGO will not be
able to see them because the longest frequency wave it can detect is
about a 10th of a second and colliding supermassive Black Holes would
produce gravitational waves with a period of hours or days; however
such waves might be detectable by observing simultaneous tiny changes
in the frequency of pulsars located in widely separated places; this
is because the gravitational waves would slightly move the Earth and
thus slightly change the observed frequency of the pulsars in a way
that was consistent with their location relative to us.
The great thing about this prediction is that we'll know if it's right
or wrong within the next 3 years.
Tick-Tock: The Imminent Merger of a Supermassive Black Hole Binary
<https://arxiv.org/pdf/2201.11633.pdf>
John K Clark See what's on my new list at Extropolis
<https://groups.google.com/g/extropolis>
bb9
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