Zobrazeno 1 - 10
of 188
pro vyhledávání: '"van Kerkwijk, Marten"'
Pulsar scintillation can be used to measure small scale structure in the Galaxy, but little is known about the specific interstellar medium features that cause scintillation. We searched for interstellar medium counterparts to all scintillation scree
Externí odkaz:
http://arxiv.org/abs/2407.16876
Autor:
Nadeau, Thierry Serafin, van Kerkwijk, Marten H., Bassa, Cees G., Stappers, Ben W., Mickaliger, Mitchell B., Lyne, Andrew G.
Using archival data from the 42 foot telescope at the Jodrell Bank Observatory, we produce daily stacks of aligned giant pulses for the Crab pulsar, to study changes to the daily profiles between April 2012 to December 2016. From these, we identify e
Externí odkaz:
http://arxiv.org/abs/2310.07007
At 327 MHz, the observed emission of PSR B1937+21 is greatly affected by scattering in the interstellar medium, on a timescale of order the pulse period. We use the bright impulsive giant pulses emitted by the pulsar to measure the impulse response o
Externí odkaz:
http://arxiv.org/abs/2309.16525
Autor:
Lin, Rebecca, van Kerkwijk, Marten H.
We analyzed four epochs of beamformed EVN data of the Crab Pulsar at 1658.49 MHz. With the high sensitivity resulting from resolving out the Crab Nebula, we are able to detect even the faint high-frequency components in the folded profile. We also de
Externí odkaz:
http://arxiv.org/abs/2307.16362
We use four observations with the European VLBI network to measure the first precise radio parallax of the Crab Pulsar. We found two in-beam extragalactic sources just outside the Crab Nebula, with one bright enough to use as a background reference s
Externí odkaz:
http://arxiv.org/abs/2306.01617
Giant pulses emitted by PSR B1937+21 are bright, intrinsically impulsive bursts. Thus, the observed signal from a giant pulse is a noisy but direct measurement of the impulse response from the ionized interstellar medium. We use this fact to detect 1
Externí odkaz:
http://arxiv.org/abs/2305.13274
The recent development of $\theta\mhyphen\theta$ techniques in pulsar scintillometry has opened the door for new high resolution imaging techniques of the scattering medium. By solving the phase retrieval problem and recovering the wavefield from a p
Externí odkaz:
http://arxiv.org/abs/2212.01417
Autor:
Lin, Rebecca, van Kerkwijk, Marten H., Main, Robert, Mahajan, Nikhil, Pen, Ue-Li, Kirsten, Franz
The Crab Pulsar is the prime example of an emitter of giant pulses. These short, very bright pulses are thought to originate near the light cylinder, at $\sim\!1600{\rm\;km}$ from the pulsar. The pulsar's location inside the Crab Nebula offers an unu
Externí odkaz:
http://arxiv.org/abs/2211.05209
Recently, several eclipsing millisecond pulsars have been shown to experience strong and apparent weak lensing from the outflow of their ionized companions. Lensing can be a powerful probe of the ionized plasma, with the strongest lenses potentially
Externí odkaz:
http://arxiv.org/abs/2208.13868
In extreme scattering events, the brightness of a compact radio source drops significantly, as light is refracted out of the line of sight by foreground plasma lenses. Despite recent efforts, the nature of these lenses has remained a puzzle, because
Externí odkaz:
http://arxiv.org/abs/2208.06884