first discovery of a millisecond pulsar via gamma-rays

Bernd Machenschalk
Bernd Machenschalk
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Topic 196598

Holger Pletsch and the AEI announced the first discovery of a radio-quiet gamma-ray MSP.

The original article isn't freely available, but there are a lot of tech/science/astronomy sites which picked it up (e.g. ars technica). Google for J1311-3430 and you'll probably find one even in your mother tongue.

Note that this exciting discovery and the work around it is one of the things that kept us away from following up on and publishing the results of the FGRP search on Einstein@Home. I hope that with a week of good sleep Holger will be able to pick up on this.



MAGIC Quantum Mechanic
MAGIC Quantum M...
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first discovery of a millisecond pulsar via gamma-rays

Thanks Bernd,gives me something good to read since I am up at 2am and tend to stop by here every *night*

PSR J1311-3430


Mike Hewson
Mike Hewson
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Awesome ! :-) Cheers, Mike.

Awesome ! :-)

Cheers, Mike.


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Hallo! There is another one:

There is another one: PSR J1838-0537 found also by Holger Pletsch et all. You can download the article from For the german speeking community there is an article by Benjamin Knipsel - we know him from this forum here, - about the same pulsar in the actual popular scientific journal Sterne und Weltraum. This article can be downloades by paying €1,00.
The pulsar has a period of 6.9[Hz] and did show a glitch in the period of amazing 69[µs] in september 2009.

Here ist the according abstract from
We report the discovery of PSR J1838-0537, a gamma-ray pulsar found through a blind search of data from
the Fermi Large Area Telescope (LAT). The pulsar has a spin frequency of 6.9Hz and a frequency derivative
of -2.2×10-11 Hz s-1, implying a young characteristic age of 4970 years and a large spin-down power of
5.9×1036 erg s-1. Follow-up observations with radio telescopes detected no pulsations, thus PSR J1838-0537
appears radio-quiet as viewed from Earth. In September 2009 the pulsar suffered the largest glitch so far seen in
any gamma-ray-only pulsar, causing a relative increase in spin frequency of about 5.5×10-6. After the glitch,
during a putative recovery period, the timing analysis is complicated by the sparsity of the LAT photon data,
the weakness of the pulsations, and the reduction in average exposure from a coincidental, contemporaneous
change in the LAT’s sky-survey observing pattern. The pulsar’s sky position is coincident with the spatially
extended TeV source HESS J1841-055 detected by the High Energy Stereoscopic System (H.E.S.S.). The
inferred energetics suggest that HESS J1841-055 contains a pulsar wind nebula powered by the pulsar.

I hope, they will find more of this in the data we have crunched. But of course it´s a long way to go before a publication.

Kind regards and happy crunching

Bernd Machenschalk
Bernd Machenschalk
Joined: 15 Oct 04
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RE: There is another one:

There is another one: PSR J1838-0537

Not quite. If I counted correctly, Holger published 11 discovered pulsars so far, most of which were radio-quiet, but before this one none was "millisecond".



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I am crunching 2 at they

I am crunching 2 at they always run in high priority mode.

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