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Astronomers exploit a remarkable supermassive black hole binary system to measure the primary black hole's spin

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  Astronomers exploit a remarkable supermassive black hole binary system to measure the primary black hole's spin Sam Wormley <swormley1@gmail.com> - 2016-03-11 13:24 -0600
    Re: Astronomers exploit a remarkable supermassive black hole binary system to measure the primary black hole's spin moroney@world.std.spaamtrap.com (Michael Moroney) - 2016-03-11 22:19 +0000
      Re: Astronomers exploit a remarkable supermassive black hole binary system to measure the primary black hole's spin Sam Wormley <swormley1@gmail.com> - 2016-03-11 16:38 -0600

#561645 — Astronomers exploit a remarkable supermassive black hole binary system to measure the primary black hole's spin

Astronomers exploit a remarkable supermassive black hole binary system 
to measure the primary black hole's spin
> http://blogs.scientificamerican.com/life-unbounded/to-catch-a-black-hole-use-a-black-hole/?WT.mc_id=SA_DD_20160311


> Black holes may be massive but they're also extraordinarily compact,
> and that makes them very challenging objects to evaluate across vast
> cosmic distances. The era of gravitational wave astronomy now opens
> up a new set of tools for probing these objects, but researchers
> actually have a multitude of other tricks up their sleeves for trying
> to pin down black hole properties.
>
> A recently published work by Valtonen et al. in The Astrophysical
> Journal offers a glimpse into a particularly neat, and entirely
> natural black hole experiment that is also helping to reveal their
> physics.
>
> The highly luminous system known as OJ 287 (a so-called BL Lac
> quasar) has been spotted by astronomical observations for the past
> 120 years - although its true nature wasn't recognized until the 20th
> century. At a distance of some 3.5 billion light years, OJ 287 is a
> remarkable binary supermassive black hole system sitting at a
> galaxy's core; two giant holes in bound in mutual orbit. The primary
> black hole weighs in at around 18 billion solar masses, the secondary
> at a mere 150 million solar masses.



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#561704

Sam Wormley <swormley1@gmail.com> writes:

>> At a distance of some 3.5 billion light years, OJ 287 is a
>> remarkable binary supermassive black hole system sitting at a
>> galaxy's core; two giant holes in bound in mutual orbit. The primary
>> black hole weighs in at around 18 billion solar masses, the secondary
>> at a mere 150 million solar masses.

How big of a signal in LIGO would that produce upon merger?

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#561709

On 3/11/16 4:19 PM, Michael Moroney wrote:
> Sam Wormley <swormley1@gmail.com> writes:
>
>>> At a distance of some 3.5 billion light years, OJ 287 is a
>>> remarkable binary supermassive black hole system sitting at a
>>> galaxy's core; two giant holes in bound in mutual orbit. The primary
>>> black hole weighs in at around 18 billion solar masses, the secondary
>>> at a mere 150 million solar masses.
>
> How big of a signal in LIGO would that produce upon merger?
>

   I don't have the equations to do the estimate. But will continue to
   look for them.


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