Detection of Echoes in PSR B1508+55 at Frequencies below 100 MHz Using the LWA1

PSR B1508+55 is known to have a single component profile above 300 MHz. However, when we study it at frequencies below 100 MHz using the first station of the Long Wavelength Array, it shows multiple components. These include the main pulse, a precursor, a postcursor, and a trailing component. The se...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 892; no. 1; pp. 26 - 31
Main Authors Bansal, K., Taylor, G. B., Stovall, Kevin, Dowell, Jayce
Format Journal Article
LanguageEnglish
Published Philadelphia The American Astronomical Society 20.03.2020
IOP Publishing
Subjects
Astrophysics
Echoes
Electron density
Interstellar matter
Interstellar Medium
Pulsars
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Summary:PSR B1508+55 is known to have a single component profile above 300 MHz. However, when we study it at frequencies below 100 MHz using the first station of the Long Wavelength Array, it shows multiple components. These include the main pulse, a precursor, a postcursor, and a trailing component. The separation of the trailing component from the main peak evolves over the course of a three year study. This evolution is likely an effect of the pulse signal getting refracted off an ionized gas cloud (acting as a lens) leading to what appears to be a trailing component in the profile as the pulsar signal traverses the interstellar medium. Using this interpretation, we identify the location and electron density of the lens affecting the pulse profile.
Bibliography:High-Energy Phenomena and Fundamental Physics
AAS16590
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab76bc