47 Tuc sings

[erick (Eric)]

Like listening to pulsars?

Try these 16 from 47 Tuc:-

http://www.jb.man.ac.uk/research/pul...7tuc1-8000.wav

They sure are amazing objects. Absolutely boggles the mind to imagine the forces at work in a millisecond pulsar.

[DavidU (Dave)]

Wouldn't it be a shame if we were the only life forms in the universe to marvel at such things.
Thanks for sharing.

[Suzy]

Thankyou Eric. I've never heard a pulsar before!

[renormalised (Carl)]

Yep, they're amazing little critters

[Starkler (Geoff)]

For a moment I thought it was going to be about this guy

[Paddy (Patrick)]

Originally Posted by Starkler

For a moment I thought it was going to be about this guy

That's what I wondered too!

I always thought that there was something particularly hypnotic about 47 Tuc (the GC, that is)

[erick (Eric)]

A range of rotation frequencies on their site:-

http://www.jb.man.ac.uk/research/pul...cation/Sounds/

"This is the second fastest known pulsar, rotating with a period of 0.00155780644887275 seconds, or about 642 times a second. The surface of this star is moving at about 1/7 of the velocity of light and illustrates the enormous gravitational forces which prevent it flying apart due to the immense centrifugal forces. The fastest-rotating pulsar is PSR J1748-2446ad, which rotates about 10% faster at 716 times a second."

Try to land there!

[Jarvamundo (Alex)]

Thanks Eric, great sounds there...

Not sure how long the rotation model will last though... got the feeling there are far simpler explanations... PSR J1748-2446ad = 43,000 RPM all sorts of strange matter inventions are required to keep 'spinning' at .25C.

Pulsars are found 'spinning up' and 'spinning down' and having short period frequency glitches, outbursts, all no place in a g-spin prediction.

Interesting objects...

[Robh (Rob)]

Sounds like a good soundtrack for a Sci-Fi movie.

The upper limit for the diameter of Terzan 5ad (PSR J1748-2446ad) is thought to be 30 kms.
More here ...
http://www.skyandtelescope.com/news/...tml?page=1&c=y

Regards, Rob.

[Jarvamundo (Alex)]

We believe that the matter in neutron stars is denser than an atomic nucleus, but it is unclear by how much.....

...The pulsar can't be more than 30 kilometers (20 miles) across, otherwise the ultrafast spin would begin to break it apart.

Q: why is it?
A: cos it can't be more

These are theoretical gravity limits, not measurements... and relies groupings of matter way beyond anything empirically stable.

After something a bit simpler, with some empirics? http://www.youtube.com/watch?v=egJhrvS2IGI

sound similar?

All you'd need would be for the pulsars of 47tuc to be binary pairs...

http://www.naic.edu/~pfreire//47Tuc/

The acceleration searches employed by Camilo et al. revealed a much higher incidence of binary systems in 47 Tuc than the earlier searches. Currently, 15 of the 22 pulsars (68%) are in binary systems

just an idea ;-)
spin ups, spin downs, fluctuations, outbursts, etc... all expected.... no need for 25% of C rotation or this other fantastic 'strange matter' that's never been seen.

[renormalised (Carl)]

Originally Posted by Jarvamundo

Q: why is it?
A: cos it can't be more

These are theoretical gravity limits, not measurements... and relies groupings of matter way beyond anything empirically stable.

After something a bit simpler, with some empirics? http://www.youtube.com/watch?v=egJhrvS2IGI

sound similar?

All you'd need would be for the pulsars of 47tuc to be binary pairs...

http://www.naic.edu/~pfreire//47Tuc/


just an idea ;-)
spin ups, spin downs, fluctuations, outbursts, etc... all expected.... no need for 25% of C rotation or this other fantastic 'strange matter' that's never been seen.

Problem is, Alex, how are you going to measure the gravitational field around the pulsar unless there's something in orbit about it. Or its surface gravity unless you have instruments sitting on its surface. Good luck with that!!!.

Your idea might be an explanation in some cases (only if the pulsars are close enough together to generate an enormous flux tube between their respective poles), but not in every case. However, it could just as easily be high energy electrons being whipped around along with the flux tubes within the magnetic fields of the pulsars...basically generating radio waves.

Plus, you have to remember, millisecond pulsars are part of binary systems, but the primary of those systems is either a giant star that's filled it's Roche Lobe and is spilling gas onto the pulsar, or a main sequence star in a very tight orbit around the pulsar and is being pulled apart. Most of those slower pulsars are loners. Most binary pulsars are in exceedingly tight orbits and have very quick orbital motions, but are themselves not necessarily in the millisecond category.

[Jarvamundo (Alex)]

Originally Posted by renormalised

Problem is, Alex, how are you going to measure the gravitational field around the pulsar unless there's something in orbit about it. Or its surface gravity unless you have instruments sitting on its surface. Good luck with that!!!.

Glad you agree on the empirical gap here... We have established how this "30km radius" figure has come about.

Originally Posted by renormalised

Your idea might be an explanation in some cases (only if the pulsars are close enough together to generate an enormous flux tube between their respective poles), but not in every case. However, it could just as easily be high energy electrons being whipped around along with the flux tubes within the magnetic fields of the pulsars...basically generating radio waves.

Certainly not my idea... just pointing out electrical discharges are really quite easy to replicate in labs...
Don Scott @ NASA
http://www.youtube.com/watch?v=OBc6Owps9pY (8 minutes 30)
http://public.lanl.gov/alp/plasma/do...Peratt1995.pdf

is this a complete model? well no, but there are some striking empirical results that could help avoid 'strange' inventions.

Originally Posted by renormalised

Plus, you have to remember, millisecond pulsars are part of binary systems, but the primary of those systems is either a giant star that's filled it's Roche Lobe and is spilling gas onto the pulsar, or a main sequence star in a very tight orbit around the pulsar and is being pulled apart. Most of those slower pulsars are loners. Most binary pulsars are in exceedingly tight orbits and have very quick orbital motions, but are themselves not necessarily in the millisecond category.

I have difficulties with inventing new states of hypothetical matter, and squeezing 1.3 solar masses into a 30km object, and spinning it at 25% of C!

It's even more difficult to swallow this unimaginably heavy, ridiculously fast object will need to 'spin up', 'spin down', 'outbursts', 'frequency glitches'....

Some empirical discharge and reflected transmission experiments, as performed by Peratt above, seem.... well... a bit more real to me, than super-duper strange stuff...

Just ideas that could help, in part.... no need to dismiss

[icytailmark (Mark)]

its sounds like someone pressing keys on a piano

[Astro78]

well that was a fantastic first. how did they convert to sound?

Sounded creepy, or perhaps 'twas just the candle blowing out during the loud part