Date: 23/01/2017 04:46:37
From: Tau.Neutrino
ID: 1013879
Subject: Scientists might have finally decoded pulsars

Scientists might have finally decoded the strange signals coming from pulsars

Astronomers studying pulsars may have finally unravelled why these mysterious pulsating objects appear to send different kinds of signals into space – by tracking the immense cloud trails of their nebulae.

More…

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Date: 23/01/2017 06:39:30
From: mollwollfumble
ID: 1013942
Subject: re: Scientists might have finally decoded pulsars

Some earlier Chandra images of pulsars:

Crab pulsar:

Vela pulsar

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Date: 23/01/2017 07:10:48
From: mollwollfumble
ID: 1013946
Subject: re: Scientists might have finally decoded pulsars

Some more Chandra Pulsar images.

Pulsar IC 443

PSR J0357

Why so few?

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Date: 23/01/2017 07:12:03
From: btm
ID: 1013947
Subject: re: Scientists might have finally decoded pulsars

Do you know what wavelengths those images are from?

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Date: 23/01/2017 07:36:09
From: mollwollfumble
ID: 1013955
Subject: re: Scientists might have finally decoded pulsars

btm said:


Do you know what wavelengths those images are from?

Possibly. I’ll check. Chandra images as published are monochrome, but the wavelength from memory is broadband X-ray rather than narrowband.

Highest observational efficiency of Chandra is at 3 to 5 keV. Full range is 0.4 to 10 keV
Translating that as a wavelength, highest efficiency is 0.25 to 0.41 nm. Full range is 0.12 to 3.1 nm.

Comparing that with X-rays in general:

“Most X-rays have a wavelength ranging from 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz and energies in the range 100 eV to 100 keV.”

So, pretty middle of the range, as X-rays go.

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Date: 24/01/2017 04:12:50
From: Cymek
ID: 1014274
Subject: re: Scientists might have finally decoded pulsars

I wonder if anyone has thought of monitoring pulsars to see if they are being manipulated to send artificial signals

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Date: 24/01/2017 04:18:12
From: mollwollfumble
ID: 1014284
Subject: re: Scientists might have finally decoded pulsars

Cymek said:


I wonder if anyone has thought of monitoring pulsars to see if they are being manipulated to send artificial signals

Yes. From the very earliest days. The first “glitch” in pulsar signals – that is actually the technical term – was spotted in 1969, and many more have been seen since then.

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Date: 24/01/2017 04:26:55
From: mollwollfumble
ID: 1014292
Subject: re: Scientists might have finally decoded pulsars

Cymek said:


I wonder if anyone has thought of monitoring pulsars to see if they are being manipulated to send artificial signals

Yes. From the very earliest days. The first “glitch” in pulsar signals – that is actually the technical term – was spotted in 1969, and many more have been seen since then.

That’s just two years after the first pulsar discovery.

In addition, I note that in 2010, SETI reported that the Crab pulsar had had “giant pulses”.

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Date: 24/01/2017 04:34:08
From: mollwollfumble
ID: 1014296
Subject: re: Scientists might have finally decoded pulsars

Cymek said:


I wonder if anyone has thought of monitoring pulsars to see if they are being manipulated to send artificial signals

Yes. From the very earliest days. The first “glitch” in pulsar signals – that is actually the technical term – was spotted in 1969, and many more have been seen since then.

That’s just two years after the first pulsar discovery.

In addition, I note that in 2010, SETI reported that the Crab pulsar had had “giant pulses”.

You may be interested in the SETI “Astropulse” project. This is a pretty boring paper, but it outlines the process and results so far, including finding 10 giant pulses from the Crab pulsar and finding new pulsars. Status of the UC-Berkeley SETI Efforts

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