Low frequency gravitational waves

tullio
tullio
Joined: 22 Jan 05
Posts: 2,087
Credit: 52,365,299
RAC: 77,348
Topic 226879

According to "Nature" an article published in the January issue of "Monthly Notices of the Royal Astronomical Society" refers the results of the "International Timing Pulsar Array", a cooperation of six radiotelescopes including Arecibo, Green Bank, Sardinia, Lovell and Westerbork which measured the frequencies of 65 pulsars over a period of 15 yers. The pulsar frequency can vary by a very small amount when it is hit by a gravitational wave, so it must be measured with great precision.The original article puts forward the idea of a gravitational  waves background similar to the Cosmic microwave background but says this is not yet definitely proven.Could our data on gamma ray pulsars be included in this project?

Tullio

Mike Hewson
Mike Hewson
Moderator
Joined: 1 Dec 05
Posts: 6,317
Credit: 154,218,385
RAC: 141,150

tullio wrote: Could our data

tullio wrote:

Could our data on gamma ray pulsars be included in this project?

My guess is : probably not.

I reckon the gamma ray data may not by itself give a sufficiently good pulse definition - one only receives a single gamma photon per many thousands of revolutions - to be sufficiently precise about pulse arrival times, that could in turn reliably yield a demonstrable shift due to a gravitational wave.

Compare that to a radio pulsar where very many radio frequency photons are received per pulsar cycle.

Cheers, Mike.

I have made this letter longer than usual because I lack the time to make it shorter ...

... and my other CPU is a Ryzen 5950X :-) Blaise Pascal

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.