Our deep follow-up search results accepted for publication in The Astrophysical Journal: thank you!

Submitted on 20 May 2020 13:29:25 UTC

A new paper on Einstein@Home results was accepted for publication in The Astrophysical Journal!

It describes a deep follow-up of results from the Einstein@Home search on LIGO O1 data for gravitational waves from central compact objects in three supernova remnants. It also presents the first electromagnetic follow-up of a continuous gravitational-wave candidate performed to date.

Many heart-felt thanks to all of you who made this work possible by donating cycles from your computers!

Read the paper for free at https://arxiv.org/abs/2005.06544.
If you want to learn more about our research watch https://www.youtube.com/watch?v=7xIAHdDipNg.

Comments

Bernd Machenschalk
Bernd Machenschalk
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Dear volunteers ! A

20 May 2020 13:31:00 UTC
Message 177923
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    Dear volunteers !

    A deep follow-up of the most interesting 10 000 results from the Einstein@Home search on LIGO O1 data targeting emission from the central compact object in the supernova remnants Vela Jr., Cassiopeia A and G347.3-0.5 was accepted for publication in The Astrophysical Journal. You can read the paper already at https://arxiv.org/abs/2005.06544.

    We used O2 LIGO data to follow-up the O1 outliers. Interestingly one candidate survives the first O2 follow-up investigation, associated with the central compact object in SNR G347.3-0.5, but it is not conclusively confirmed. In order to assess a possible astrophysical origin we searched archival X-ray data for a pulsed signal at the rotation frequency of the neutron star and its harmonics. This represents the first extensive electromagnetic follow-up of a continuous gravitational wave candidate performed to date. Unfortunately we could not identify any significant associated signal, but the X-ray search had a limited sensitivity due to the large distance in time between the X-ray and the gravitational-wave observations. 

    New X-ray observations contemporaneous with the LIGO O3 run will enable a more sensitive search for an electromagnetic counterpart. A focused gravitational wave search in O3 data based on the parameters provided by our search should be easily able to shed light on the nature of this outlier. Noise investigations on the LIGO instruments could also reveal the presence of a coherent contamination.

    Many heart-felt thanks to all of you who made this work possible by donating cycles from your computers !

    Dr. M.A. Papa

    Independent Research Group Leader

    Max Planck Institut f. Gravitationsphysik

    BM

    [AF>Amis des Lapins] Bipleouf
    [AF>Amis des La...
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    Very interesting! I am proud

    20 May 2020 18:19:50 UTC
    Message 177942
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      Very interesting! I am proud and super happy to be able to contribute with my little android to the advanced on astronomy and the search for pulsar.

      Thank you to the whole team for giving us this chance to be able to dream with you ...

       

       

       
      QuantumHelos
      QuantumHelos
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      "Dark is the light unto the

      21 May 2020 1:02:54 UTC
      Message 177962
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        "Dark is the light unto the heavens, Bold are the steps of men unto the heavens, Though gods do move the deep"

        So it come to write about evens among the stars,

        Motions against the refrain of a deep and earth shattering motion..

        Found inside the heart of dyeing stars.. a beak and apparently endless series of events unfolds..

        Shattering the web of spacial matter in the universe; Fundamentally for EVER..

        Einstein.org a projection of Logos desires produces such results.

         

        QE

         

         

         

         

         

        "We perform a sub-threshold follow-up search for continuous nearly-monochromatic gravitational waves from the central compact objects associated with the supernova remnants Vela Jr., Cassiopeia A, and SNR G347.3

        −0.5. Across the three targets, we investigate the most promising ~ 10,000 combinations of gravitational wave frequency and frequency derivative values, based on the results from an Einstein@Home search of the LIGO O1 observing run data, dedicated to these objects. The selection threshold is set so that a signal could be confirmed using the newly released O2 run LIGO data. In order to achieve best sensitivity we perform two separate follow-up searches, on two distinct stretches of the O2 data. Only one candidate survives the first O2 follow-up investigation, associated with the central compact object in SNR G347.3-0.5, but it is not conclusively confirmed. In order to assess a possible astrophysical origin we use archival X-ray observations and search for amplitude modulations of a pulsed signal at the putative rotation frequency of the neutron star and its harmonics. This is the first extensive electromagnetic follow-up of a continuous gravitational wave candidate performed to date. No significant associated signal is identified. New X-ray observations contemporaneous with the LIGO O3 run will enable a more sensitive search for an electromagnetic counterpart. A focused gravitational wave search in O3 data based on the parameters provided here should be easily able to shed light on the nature of this outlier. Noise investigations on the LIGO instruments could also reveal the presence of a coherent contamination."

        Results to be further improved with : ML,CN Baleen & Noise ablation, Filter optimisation,

        Metalic & Physical; Electro Mechanical .. interaction studies..

        Data graph filtration & optimisation.

         

        Static data is often not enough, ML,CNN improvement strategy leaves SVM Optimisation ideal, Python, C++, Fortran's & OpenCL : SysCL (Khronos) : Vulcan SDK

         

        benchmark CPU 0: fp 2688000000.000000 int 9137190918.864225 intloops 158032000.000000 inttime 9.843750 : CPU 40: fp 2926962457.337884 int 0.000000 intloops 0.000000 inttime 0.000000  SVM ML Spec : Green world  Support vector machine,  Machine learning and data min

        https://www.analyticsvidhya.com/blog/2017/09/understaing-support-vector-machine-example-code/
        https://scikit-learn.org/stable/modules/svm.html
        https://towardsdatascience.com/https-medium-com-pupalerushikesh-svm-f4b42800e989
        https://towardsdatascience.com/support-vector-machine-introduction-to-machine-learning-algorithms-934a444fca47?gi=51274a92cf9b
        http://web.mit.edu/6.034/wwwbob/svm-notes-long-08.pdf
        Mike Hewson
        Mike Hewson
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        Soooo ..... we nearly found

        21 May 2020 10:25:00 UTC
        Message 177966
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          Soooo ..... we nearly found the first continuous gravitational wave source ?  Cool. Expectation is in the air and E@H is in the hunt !! ;-)

          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

          Falconet
          Falconet
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          Very cool indeed!

          24 May 2020 22:43:42 UTC
          Message 178063
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            Very cool indeed!

            ProDigit
            ProDigit
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            Thanks for keeping us in the

            7 Jun 2020 20:16:53 UTC
            Message 178370
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              Thanks for keeping us in the loop!

               

              LacriMosa
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              Congratulations!

              11 Jun 2020 2:39:47 UTC
              Message 178456
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                Congratulations!

                Ron F
                Ron F
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                Congratulation to you all. I

                15 Jun 2020 3:24:03 UTC
                Message 178517
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                  Congratulation to you all. I bought a Raspberry PI 4 just for this project I am really happy to donate my cpu to any and all projects that needs my help. 

                   

                  I am planing on building a PI cluster to devote to just this kind of work for and of this work that needs more cpu cycles to help find the information we all need for the future of man kind and space.

                   

                  drsrikar
                  drsrikar
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                  i am glad for all of

                  15 Jun 2020 16:52:31 UTC
                  Message 178519
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                    i am glad for all of you...lets see this in news media .

                    Patrick Nelson
                    Patrick Nelson
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                    Happy to help!

                    22 Jun 2020 6:02:00 UTC
                    Message 178606
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                      Happy to help!

                      Bernd Machenschalk
                      Bernd Machenschalk
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                      The paper was published in

                      1 Jul 2020 14:15:00 UTC
                      Message 178709
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                        The paper was published in APJ.

                        Thank you all again!

                        BM