More gravitational waves detected

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Re: More gravitational waves detected

#41  Postby newolder » May 17, 2019 8:59 am

Most distant candidate BBH yet. If confirmed, the radiation originated about 10 billion light years away.
https://gracedb.ligo.org/superevents/S190517h/view/
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Re: More gravitational waves detected

#42  Postby newolder » May 20, 2019 11:39 am

^ That distance record lasted a whole 2 days if this newer BBH candidate is confirmed - 10.2-ish billion light years...
https://gracedb.ligo.org/superevents/S190519bj/view/
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Re: More gravitational waves detected

#43  Postby tuco » May 20, 2019 1:38 pm

The Universe Probably 'Remembers' Every Single Gravitational Wave - https://www.livescience.com/65441-gravi ... emory.html

Persistent gravitational wave observables: General framework - https://journals.aps.org/prd/abstract/1 ... .99.084044

----

Sounds cool but what does it mean for astro/physics? Could this be used for anything else but "history of gravitational waves" field?
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Re: More gravitational waves detected

#44  Postby felltoearth » May 20, 2019 1:50 pm

tuco wrote:The Universe Probably 'Remembers' Every Single Gravitational Wave - https://www.livescience.com/65441-gravi ... emory.html

Persistent gravitational wave observables: General framework - https://journals.aps.org/prd/abstract/1 ... .99.084044

----

Sounds cool but what does it mean for astro/physics? Could this be used for anything else but "history of gravitational waves" field?

I don’t know why they use the word memory here which implies an act of remembering on the part of the universe. Memorial or trace might be better. Seems no different than, say, geology which isn’t a memory but a trace of geologic events.

ETA maybe “memory” means something different in physics like the word “information.” :ask:

EETA and here we are. https://www.physicscentral.com/explore/ ... d-time.cfm
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Re: More gravitational waves detected

#45  Postby newolder » May 21, 2019 9:43 am

2 candidate BBH events so far today:
https://gracedb.ligo.org/superevents/S190521g/
https://gracedb.ligo.org/superevents/S190521r/

If confirmed, both are closer than yesterday's.
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Re: More gravitational waves detected

#46  Postby newolder » Jul 25, 2019 10:02 am

Even though there have been many candidate mergers observed by the LIGO/VIRO teams over the past few months, here's a "truth is stranger than fiction" observation from a team reporting to the National Optical Astronomy News.

The report is of a binary white dwarf system with a period of just 6.91 minutes (and an orbital diameter that would fit the system within the planet Saturn) making it the fastest white dwarf binary system yet observed. The dynamics are calculated to yield gravitational wave emissions suited exactly to the mid-region of detectability in the proposed LISA space-based gravitational wave observatory.

2 stars orbiting each other in less than 7 minutes!

Full story at link above.
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Re: More gravitational waves detected

#47  Postby newolder » Jul 28, 2019 8:44 am

via LIGO on twitter
Estimated false alarm rate for #S190728q is once every million billion years, so this looks like a very strong candidate for a real #GravitationalWaves event - our 22nd since our 3rd observing run began on April 1st. You can find a full list at https://gracedb.ligo.org/superevents/public/O3/
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Re: More gravitational waves detected

#48  Postby newolder » Apr 20, 2020 3:11 pm

The latest reported BBH merger, 2.7 billion light years away, is where two black holes with significantly different masses coalesced. Three gravitational wave observatories were working at the time, 2xLIGO + VIRGO. The visualisation is pretty cool too.
https://twitter.com/QuantumOfSalsa/stat ... 5101880324
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Re: More gravitational waves detected

#49  Postby Macdoc » Apr 20, 2020 6:34 pm

You mean there is a universe outside of Covid ?? :scratch:
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Re: More gravitational waves detected

#50  Postby newolder » Jun 23, 2020 5:00 pm

The latest merger signals doing the rounds (both LIGOs + VIRGO detections reported) are about a merger between a 23.2 Solar mass black hole and an unknown "mass gap" object of 2.6 Solar masses that would be the lightest black hole or the heaviest neutron star hitherto. As they have now merged, I guess we'll never know. Here's the "in a nutshell" poster via twitter

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Astrophysical Journal Letters write up pdf by an author or few...
Abstract

We report the observation of a compact binary coalescence involving a 22.2–24.3 Msolar black hole and a compact
object with a mass of 2.50–2.67 Msolar (all measurements quoted at the 90% credible level). The gravitational-wave signal, GW190814, was observed during LIGO’s and Virgo’s third observing run on 2019 August 14 at
21:10:39 UTC and has a signal-to-noise ratio of 25 in the three-detector network. The source was localized to 18.5 deg2 at a distance of 241+41-45 Mpc; no electromagnetic counterpart has been confirmed to date. The source has the most unequal mass ratio yet measured with gravitational waves, 0.112+0.008-0.009, and its secondary component is either the lightest black hole or the heaviest neutron star ever discovered in a double compact-object system. The dimensionless spin of the primary black hole is tightly constrained to „0.07. Tests of general relativity reveal no measurable deviations from the theory, and its prediction of higher-multipole emission is confirmed at high confidence. We estimate a merger rate density of 1–23 Gpc−3 yr−1 for the new class of binary coalescence sources that GW190814 represents. Astrophysical models predict that binaries with mass ratios similar to this event can form through several channels, but are unlikely to have formed in globular clusters. However, the combination of mass ratio, component masses, and the inferred merger rate for this event challenges all current models of the formation and mass distribution of compact-object binaries.
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Re: More gravitational waves detected

#51  Postby Ironclad » Jun 23, 2020 9:05 pm

'Black neutron star' discovery changes astronomy https://www.bbc.co.uk/news/science-environment-53151106
Bit more
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Re: More gravitational waves detected

#52  Postby felltoearth » Jun 24, 2020 3:00 pm

Ironclad wrote:'Black neutron star' discovery changes astronomy https://www.bbc.co.uk/news/science-environment-53151106
Bit more

Interesting that they could make that discovery given that gravity isn’t something that has an effect on the universe. Thinking of Wortfish here.
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Re: More gravitational waves detected

#53  Postby Ironclad » Jun 24, 2020 7:08 pm

It doesn’t?
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Re: More gravitational waves detected

#54  Postby newolder » Jun 25, 2020 9:08 pm

Another interesting detection. This time of light from a black hole merger. Two black holes in the accretion disk of a third merged and caused enough ruckus to emit a visible signal along with the gravitational waves...
JUNE 25, 2020
Black Hole Collision May Have Exploded With Light

When two black holes spiral around each other and ultimately collide, they send out gravitational waves - ripples in space and time that can be detected with extremely sensitive instruments on Earth. Since black holes and black hole mergers are completely dark, these events are invisible to telescopes and other light-detecting instruments used by astronomers. However, theorists have come up with ideas about how a black hole merger could produce a light signal by causing nearby material to radiate.

Now, scientists using Caltech's Zwicky Transient Facility (ZTF) located at Palomar Observatory near San Diego may have spotted what could be just such a scenario. If confirmed, it would be the first known light flare from a pair of colliding black holes.

The merger was identified on May 21, 2019, by two gravitational wave detectors - the National Science Foundation's Laser Interferometer Gravitational-wave Observatory (LIGO) and the European Virgo detector - in an event called GW190521g. That detection allowed the ZTF scientists to look for light signals from the location where the gravitational wave signal originated. These gravitational wave detectors have also spotted mergers between dense cosmic objects called neutron stars, and astronomers have identified light emissions from those collisions.

The ZTF results are described in a new study published in the journal Physical Review Letters. The authors hypothesize that the two partner black holes, each several dozen times more massive than the Sun, were orbiting a third, supermassive black hole that is millions of times the mass of the Sun and surrounded by a disk of gas and other material. When the two smaller black holes merged, they formed a new, larger black hole that would have experienced a kick and shot off in a random direction. According to the new study, it may have plowed through the disk of gas, causing it to light up.

...

More @ NASA JPL link
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Re: More gravitational waves detected

#55  Postby theropod_V_2.0 » Jun 25, 2020 10:43 pm

...and what were those objections raised when these were first detected?

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Re: More gravitational waves detected

#56  Postby newolder » Jun 26, 2020 7:31 am

Have I missed some objections somewhere? :book:
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Re: More gravitational waves detected

#57  Postby theropod_V_2.0 » Jun 26, 2020 10:10 am

Yes. When the first positive results started coming in there were nay-sayers that claimed there wasn’t enough confidence in the observations, and that there should be some way to confirm the findings via some other confirmation data. Well, here’s that secondary supporting evidence.

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Re: More gravitational waves detected

#58  Postby newolder » Jun 26, 2020 10:42 am

Aha, now you come to mention it, yes, there were early nay-sayers but the weight(!) of evidence from the 3 detectors (and soon to be more) is now overwhelming. The first reported neutron star black hole merger in 2019, https://arxiv.org/abs/1912.03466 , and the associated broad band e-m (multi-messenger) signals were close to the final nail for most of the detractors, I guess.
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Re: More gravitational waves detected

#59  Postby Svartalf » Jun 26, 2020 3:49 pm

There's no supporting avidence, Dog did not make gravity in waves, and all those are false readings where the scientists saw what they wanted to more than what is really there.
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Re: More gravitational waves detected

#60  Postby theropod_V_2.0 » Jun 26, 2020 4:58 pm

:this:

See, all you Poes out there, this is how it’s done!

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