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"content": "<p>lots of fun <a href=\"https://aus.social/tags/pulsar\" class=\"mention hashtag\" rel=\"tag\">#<span>pulsar</span></a> papers on arXiv today - but this is my fav (biased of course, some of these folks in our team, though this is not PPTA paper).</p><p>Pulsar radio waves are scattered off turbulent ISM plasma structures (<= AU-sized) and present as scintillation arcs in power spectra analysis. What that means is that when we plot the spectrum over time, we can look at the power of that spectrum and we see these scintillation arcs - they are like ghosts inside the data!</p><p>BUT - they tell us things!</p><p>Arc curvature depends on distance, velocity, and orientation of scattering layers, so it can help probe these parameters.</p><p>This was analysed for PSR J0437-4715 (closest and brightest millisecond pulsar to Earth) so the team modelled the pulsar-WD binary system ploughing through the ISM.</p><p>Look at its bow-shock! From this model, they can see that the conical structure is tilted away from our view by about 23-degrees, and is caused by the pulsar moving (very fast) through the interstellar medium.</p><p>In that second plt we can't see the pulsar (it's ~20km across), but that bright dot is the white dwarf companion. They're in a 5.7 day orbit, so effectively, from this distance we can say that the pulsar is in the same location.</p><p>Check out the paper here: arxiv.org/abs/2410.21390</p><p><a href=\"https://aus.social/tags/Astrophysics\" class=\"mention hashtag\" rel=\"tag\">#<span>Astrophysics</span></a> <a href=\"https://aus.social/tags/Astrodon\" class=\"mention hashtag\" rel=\"tag\">#<span>Astrodon</span></a> <a href=\"https://aus.social/tags/RadioAstronomy\" class=\"mention hashtag\" rel=\"tag\">#<span>RadioAstronomy</span></a></p>",
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"en": "<p>lots of fun <a href=\"https://aus.social/tags/pulsar\" class=\"mention hashtag\" rel=\"tag\">#<span>pulsar</span></a> papers on arXiv today - but this is my fav (biased of course, some of these folks in our team, though this is not PPTA paper).</p><p>Pulsar radio waves are scattered off turbulent ISM plasma structures (<= AU-sized) and present as scintillation arcs in power spectra analysis. What that means is that when we plot the spectrum over time, we can look at the power of that spectrum and we see these scintillation arcs - they are like ghosts inside the data!</p><p>BUT - they tell us things!</p><p>Arc curvature depends on distance, velocity, and orientation of scattering layers, so it can help probe these parameters.</p><p>This was analysed for PSR J0437-4715 (closest and brightest millisecond pulsar to Earth) so the team modelled the pulsar-WD binary system ploughing through the ISM.</p><p>Look at its bow-shock! From this model, they can see that the conical structure is tilted away from our view by about 23-degrees, and is caused by the pulsar moving (very fast) through the interstellar medium.</p><p>In that second plt we can't see the pulsar (it's ~20km across), but that bright dot is the white dwarf companion. They're in a 5.7 day orbit, so effectively, from this distance we can say that the pulsar is in the same location.</p><p>Check out the paper here: arxiv.org/abs/2410.21390</p><p><a href=\"https://aus.social/tags/Astrophysics\" class=\"mention hashtag\" rel=\"tag\">#<span>Astrophysics</span></a> <a href=\"https://aus.social/tags/Astrodon\" class=\"mention hashtag\" rel=\"tag\">#<span>Astrodon</span></a> <a href=\"https://aus.social/tags/RadioAstronomy\" class=\"mention hashtag\" rel=\"tag\">#<span>RadioAstronomy</span></a></p>"
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"name": "Plot showing time on the x-axis and wavelength on the y-axis, with the data reflecting the power spectrum of the intensity fluctuations of pulsar signals. This is represented by many bright pink inverted arcs all compounding at a central point of 0. An inset als shows a more focused version of this.",
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"name": "plot with right ascension on the x-axis and declination on y-axis, showing a bright point with arrows pointing ahead of it. This is the pulsar binary system and arrows point in direction of travel. Around it, is a bow-shock structure annotated with concentric rings to reveal its long tail.",
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