Measuring Interstellar Delays of PSR J0613-0200 over 7 years, using the Large European Array for Pulsars. (arXiv:2009.10707v1 [astro-ph.HE])

Measuring Interstellar Delays of PSR J0613-0200 over 7 years, using the Large European Array for Pulsars. (arXiv:2009.10707v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Main_R/0/1/0/all/0/1">R. A. Main</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sanidas_S/0/1/0/all/0/1">S. A. Sanidas</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Antoniadis_J/0/1/0/all/0/1">J. Antoniadis</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bassa_C/0/1/0/all/0/1">C. Bassa</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chen_S/0/1/0/all/0/1">S. Chen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cognard_I/0/1/0/all/0/1">I. Cognard</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gaikwad_M/0/1/0/all/0/1">M. Gaikwad</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hu_H/0/1/0/all/0/1">H. Hu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Janssen_G/0/1/0/all/0/1">G. H. Janssen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Karuppusamy_R/0/1/0/all/0/1">R. Karuppusamy</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kramer_M/0/1/0/all/0/1">M. Kramer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lee_K/0/1/0/all/0/1">K. J. Lee</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Liu_K/0/1/0/all/0/1">K. Liu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mall_G/0/1/0/all/0/1">G. Mall</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+McKee_J/0/1/0/all/0/1">J. W. McKee</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mickaliger_M/0/1/0/all/0/1">M. B. Mickaliger</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Perrodin_D/0/1/0/all/0/1">D. Perrodin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stappers_B/0/1/0/all/0/1">B. W. Stappers</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tiburzi_C/0/1/0/all/0/1">C. Tiburzi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wucknitz_O/0/1/0/all/0/1">O. Wucknitz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wang_L/0/1/0/all/0/1">L. Wang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhu_W/0/1/0/all/0/1">W. W. Zhu</a>

Using data from the Large European Array for Pulsars (LEAP), and the
Effelsberg telescope, we study the scintillation parameters of the millisecond
pulsar J0613-0200 over a 7 year timespan. The “secondary spectrum” — the 2D
power spectrum of scintillation — presents the scattered power as a function
of time delay, and contains the relative velocities of the pulsar, observer,
and scattering material. We detect a persistent parabolic scintillation arc,
suggesting scattering is dominated by a thin, anisotropic region. The
scattering is poorly described by a simple exponential tail, with excess power
at high delays; we measure significant, detectable scattered power at times out
to $sim 5 mu s$, and measure the bulk scattering delay to be between 50 to
200,ns with particularly strong scattering throughout 2013. These delays are
too small to detect a change of the pulse profile shape, yet they would change
the times-of-arrival as measured through pulsar timing. The arc curvature
varies annually, and is well fit by a one-dimensional scattering screen $sim
40%$ of the way towards the pulsar, with a changing orientation during the
increased scattering in 2013. Effects of uncorrected scattering will introduce
time delays correlated over time in individual pulsars, and may need to be
considered in gravitational wave analyses. Pulsar timing programs would benefit
from simultaneously recording in a way that scintillation can be resolved, in
order to monitor the variable time delays caused by multipath propagation.

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