ITN: Primordial Deep Space Magnetic Fields

[CraigS]

G'Day Alex;

The guys in this paper say they've measured heaps of pulsars & their fields ..

RMs for ~ (1–5) x 10∧8 polarized extragalactic sources, spaced by only ~ 30"–50" on the sky! plus:
RMs of several 1000 Galactic pulsars and several 100 pulsars in nearby galaxies

Cheers

[renormalised (Carl)]

A further nail in the EU/PC coffin...despite the contents of the paper

[Jarvamundo (Alex)]

link?

[renormalised (Carl)]

Originally Posted by CraigS

Are you trying to get out of detention ??

I didn't think I was a candidate for it

[CraigS]

Originally Posted by Jarvamundo

link?

http://arxiv.org/abs/1008.3806

I'll see if I can upload the PDF if you want.
Cheers

Here ya go (see attachment).

[bojan]

Originally Posted by Jarvamundo

Absolute sheer nonsense.

http://www.jb.man.ac.uk/~drl/publications/clf+00.pdf

I am afraid you got it wrong Alex.

The fact that pulsar is part of binary system doesn't mean it is pulsar BECAUSE it is pulsing as a consequence of interaction between binary components.
(relaxation oscillator.. still waiting for mechanism explanation...)

BTW, novae are binary system phenomenon.. So it is expected that pulsars (being collapsed cores of stars) will be part of binary system more often than single objects.

[CraigS]

Am I seeing double again ??

[renormalised (Carl)]

Absolute sheer nonsense.

http://www.jb.man.ac.uk/~drl/publications/clf+00.pdf

Now, well see just who's wrong here....

http://www.atnf.csiro.au/pasa/16_2/hopkins/paper/node7.html

There are currently about 750 pulsars identified in the current literature. All but a handful of these are within our Galaxy, and most are within a few kpc of the Sun. Pulsars fall into two main classes: `normal' pulsars which are typically less than 107 years old and have periods of between 30 ms and several seconds, and `millisecond' pulsars, which typically have periods of between 1.5 and 20 ms and are believed to be `recycled' or spun-up by accretion in a binary system. Most known pulsars are in the Galactic disk, but a significant population of millisecond pulsars is found in globular clusters. Estimates based on previous large-scale searches show that the total number of potentially detectable normal pulsars in the Galaxy is at least 30,000. Surprisingly, the total number of potentially detectable millisecond pulsars is at least as large. Existing searches have had limited sensitivity to millisecond pulsars, so they form less than 10% of the known pulsar population.

750 known pulsars (as of 1997, there's currently some 2000 or so known pulsars)....less than 10% of the known pulsars (remember...observationally verifiable (or known) is what I said) are millisecond pulsars. So, that means less than 75 (in 1997, something like 100-200 today) of all the known pulsars are millisecond pulsars, hence are/were members of binary systems. That they may be quite numerous in the overall scheme of things in no way confirms any of the theories you espouse. I seriously doubt you know very much about the millisecond pulsar mechanism or process of formation, otherwise you'd have not made the comment you did.

As a matter of fact, you have little idea of the pulsar mechanism and that can be clearly seen by the nonsense you espouse as "hard fact"

So, Alex, who's sprouting the "absolute nonsense" now???

[bojan]

Originally Posted by CraigS

Am I seeing double again ??

No..

I have no idea why there are two.. I was editing my reply and the post doubled for some mysterious reason.

EDIT:
I deleted the second one.

[renormalised (Carl)]

"107" years old is actually less than 10 million years (10E7)

[CraigS]

As an aside .. just reading the conclusion of the paper I uploaded:

The SKA “Magnetism” Key Science Project plans to observe a wide-field survey (at least 10e4 deg2) around 1 GHz with 1 h integration per field, which will measure at least 1500 RMs per deg2 and a total RM number of at least 2 × 10e7 (Gaensler et al. 2004). More than 10e4 RM values are expected in the area of M 31 and will allow the detailed reconstruction of the 3-D field structure in this and many other nearby galaxies. Large-scale field patterns can be recognized out to distances of about 100 Mpc (Stepanov et al. 2008).
The SKA pulsar survey will find about 20 000 new pulsars which will be mostly polarized and reveal RMs, perfectly suited to measure the Milky Way’s magnetic field with high precision (Noutsos 2009)..

Faraday rotation measures:

Rotation Measure (RM), which is the integral of the plasma density and the strength of the component of the field along the line of sight.

That sounds like fantastic news !! 20,000 new pulsars !! And a 3D magnetic landscape !
Amazing !

Cheers

[Outbackmanyep]

I attended Bryan Gaenslers talk at the Bok Lecture in Coonabarabran last year and he did this talk on Magnetic Universe, he explained it quite clearly and it made sense.

Here it is here:
http://www.physics.usyd.edu.au/~bmg/...Gaensler-3.pdf

And links to his other works (bottom of the page):
http://www.physics.usyd.edu.au/~bmg/

Cheers!

[CraigS]

Very cool, Outbackmanyep !!

Thanks for that info !!

Wouldn't have known they were doing all this great stuff if ya hadn't turned up!

Good onya ! Thanks.

Cheers

[renormalised (Carl)]

Just for the record, there are approximately 140 millisecond pulsars known.

[CraigS]

Source ?

[renormalised (Carl)]

Originally Posted by CraigS

Source ?

Hot chili

http://arxiv.org/abs/1008.1928

But that's hardly the only source...just type "population of pulsars", or, "population of neutron stars" at arXiv. Or goto wiki for neutron stars/pulsars. or pick up a recent textbook on astrophysics (you can do all three if you're in the position to do so).

[CraigS]

Thats another interesting paper, Carl.

In the Final Thoughts Section:

Rotating Radio Transients:
- over 30 currently known
- 2 glitches in RRAT J1819-1458; accompanied by long term decrease in spin down rate suggesting they occupied phase space populated by the magnetars. Further observations are needed to confirm this “exhausted magnetar” hypothesis. The Galactic population of such objects is potentially significant and it remains to be determined whether alternative evolutionary scenarios need to be invoked other than core-collapse supernova. Further work will certainly clarify this issue as known sources are better characterized.
Millisecond Pulsars:
- many questions remain to be answered including: (i) what is the overall Galactic distribution of millisecond pulsars?; (ii) is the millisecond pulsar luminosity function comparable to normal pulsars?; (iii) are all millisecond pulsars produced in low-mass X-ray binary systems?; and (iv) what is the origin of isolated millisecond pulsars?
Pulsars in Magellanic Clouds:
- Currently 19 radio pulsars are known in the Large and Small Magellanic Clouds;
- roughly 18,000 and 11,000 normal pulsars in the large and small clouds respectively;
- A substantial population of active radio pulsars (of order a few hundred thou- sand) have escaped the clouds and populate the local intergalactic medium. For the millisecond pulsar population, the lack of any detections from current surveys leads only upper limits of up to 40,000 sources in the two clouds.
Globular Cluster Pulsars:
- Currently, there are 140 radio pulsars in 26 GCs;
- If NSs are formed as in the Galaxy, i.e. in the core collapse supernovae of massive stars, then the large resultant velocities observed among the young pulsars would eject the vast majority of all NSs from GCs. This would result in a very small number of primordial NSs in clusters. How do GCs retain enough NSs to form all the quiescent LMXBs(??) and MSPs(??) we observe? Are there other NS formation mechanisms at work? We anticipate significant progress in many of these areas in the near future.

All great stuff ! (I don't know the terms LMXBs and MSPs ?? Help ?)
Thanks for the 'heads-up' !!

Cheers

[renormalised (Carl)]

LMXB = Low mass Xray Binary

MSP = Millisecond pulsar

[Jarvamundo (Alex)]

Originally Posted by Carl

That they may be quite numerous in the overall scheme of things in no way confirms any of the theories you espouse

flip flop and flap?

The paper i posted merely pointed out that the majority (20 out of 20) of millisecond pulsars found in Tuc47 in that paper were indeed binary systems.

This was only in response to you saying they did not exist... let us repeat...

Originally Posted by Carl

If they were close binaries, where's the spectroscopic evidence, let alone evidence from light curve/photometric and astrometric analysis. There is none and never has been.

So when Thornhill / Scott point out that we are finding out that pulsars are proving to be part of binary systems, they are indeed quite correct.

Peratt's model is slightly different and does not depend on binary per se.... But the point with both of these models is that a far more plausible function of emission exists, rather than invoking a rotating gravity blob that spins at 25% of light. We have these relaxation oscillators well developed in technology and Peratt's paper includes physical experimentation that matches the waveforms detected.

The hypothesis here is that electrical effects 'can' provide an emission function to match our observations, including the waveform which tracks very much like lightning and other plasma emissions.

As we find faster and faster pulse rates, the rotating gravity beacon model will require yet more inventions to hold the star together as it moves beyond 25% of C in velocity. See Strange-Matter-Stars. The relaxation discharge models do not suffer from these inherent weaknesses.

Bojan had a point regarding "Frequency Glitches".... now ask yourself... if you have an insanely heavy super dense start spinning faster than a dentist drill, what is the energy involved to provide the torque to (1) slow the star, (2) speed it back up... It is massive.... yes acoustic modeling and "star quakes" have attempted to provide some answers for this. For an oscillation of a plasma emission, this is far simpler explanation requiring far less energy.

2 models, 2 very different predictions.

[bojan]

Originally Posted by Jarvamundo

. The relaxation discharge models do not suffer from these inherent weaknesses.
.

And where is that relaxation model, finally?
I am still waiting for plausible mechanism explanation...