Detection of Echoes in PSR B1508+55 at frequencies below 100 MHz using the LWA1
arXiv:2003.03606 · doi:10.3847/1538-4357/ab76bc
Abstract
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.
arXiv comment6 Figures, Accepted for publication
References in corpus (23)
- Switched magnetospheric regulation of pulsar spin-down
- The Parkes Pulsar Timing Array Project
- The North American Nanohertz Observatory for Gravitational Waves
- An analysis of the timing irregularities for 366 pulsars
- Pulsar Nulling and Mode Changing
- Measurement and correction of variations in interstellar dispersion in high-precision pulsar timing
- Precision Astrometry with the Very Long Baseline Array: Parallaxes and Proper Motions for 14 Pulsars
- Getting Its Kicks: A VLBA Parallax for the Hyperfast Pulsar B1508+55
- Rocking the Lighthouse: Circumpulsar Asteroids and Radio Intermittency
- A LOFAR census of non-recycled pulsars: average profiles, dispersion measures, flux densities, and spectra
- The LWA1 Radio Telescope
- Deflection of Pulsar Signal Reveals Compact Structures in the Galaxy
- Wide-Band, Low-Frequency Pulse Profiles of 100 Radio Pulsars with LOFAR
- Pulsar Observations Using the First Station of the Long Wavelength Array and the LWA Pulsar Data Archive
- Profile shape stability and phase jitter analyses of millisecond pulsars
- A Plasma Prism Model for an Anomalous Dispersion Event in the Crab Pulsar
- Two long-term intermittent pulsars discovered in the PALFA Survey
- Geodetic Precession in PSR J1141-6545
- Evidence of an asteroid encountering a pulsar
- A transient component in the pulse profile of PSR J0738-4042
- Scattering study of Pulsars below 100 MHz using LWA1
- Low-frequency pulse profile variation in PSR B2217+47: evidence for echoes from the interstellar medium
- Simultaneous multi-frequency single pulse observations of pulsars
Cited by in corpus (6)
- The CHIME Pulsar Project: System Overview
- A Scintillation Arc Survey of 22 Pulsars with Low to Moderate Dispersion Measures
- Double-lens Scintillometry: The variable scintillation of pulsar B1508+55
- Pulsar Observations at Low Frequencies: Applications to Pulsar Timing and Solar Wind Models
- Scintillation of PSR B1508+55 -- the view from a 10,000-km baseline
- A Multifrequency Census of 100 Pulsars below 100 MHz with LWA: A Systematic Study of Flux Density, Spectra, Timing, Dispersion, Polarization, and Its Variation from a Decade of Observations