The significance of low frequency interferometric observations for the GPS pulsar flux estimation: the case of J1740+1000

TL;DR

This paper demonstrates that low frequency interferometric observations with LOFAR provide more accurate flux estimates for pulsar J1740+1000, revealing a spectral turnover at 260 MHz and highlighting the potential of imaging techniques for studying the interstellar medium.

Contribution

It introduces the use of interferometric imaging at low frequencies for precise pulsar flux measurement, especially for sources with unusual spectral features.

Findings

Confirmed spectral turnover at 260 MHz for J1740+1000

Interferometric imaging yields more accurate flux estimates than traditional methods

Supports future studies of the interstellar medium using low-frequency imaging techniques

Abstract

In this paper we present recent Low Frequency Array (LOFAR) observations of the pulsar J1740+1000. We confirm that its spectrum has a turnover at 260 MHz, which is unusual for a typical pulsar. We argue that in this case interferometric imaging provides more accurate pulsar flux estimates than other, more traditional, means such as beamformed observations. We conclude that existing calibration and imaging techniques can be used for a more comprehensive study of the influence of the interstellar medium on the point-like sources at very low frequencies in the near future.