Meterwavelength Single-Pulse Polarimetric Emission Survey

Abstract

We have conducted the Meterwavelength Single-pulse Polarimetric Emission Survey to study the radio emission properties of normal pulsars. A total of 123 pulsars with periods between 0.1 seconds and 8.5 seconds were observed in the survey at two different frequencies, 105 profiles at 333 MHz, 118 profiles at 618 MHz and 100 pulsars at both. In this work we concentrate primarily on the time-averaged properties of the pulsar emission. The measured widths of the pulsar profiles in our sample usually exhibit the radius to frequency mapping. We validate the existence of lower bounds for the distribution of profile widths with pulsar period (P ), which is seen for multiple definitions of the width, viz. a lower boundary line (LBL) at 2.7 • P −0.5 with width measured at 50% level of profile peak, a LBL at 5.7 • P −0.5 for 10% level of peak and LBL at 6.3 • P −0.5 for width defined as 5σ above the baseline level. In addition we have measured the degree of linear polarization in the average profile of pulsars and confirmed their dependence on pulsar spindown energy loss (Ė). The single pulse polarization data show interesting trends with the polarization position angle (PPA) distribution exhibiting the simple rotating vector model for highĖ pulsars while the PPA becomes more complex for medium and lowĖ pulsars. The single pulse total intensity data is useful for studying a number of emission properties from pulsars like subpulse drifting, nulling and mode changing which is being explored in separate works.

Subpulse drifting, nulling, and mode changing in PSR J2006 − 0807 with core emission

“…The pulsar J2006−0807 (B2003−08) has a prominent core component with clearly resolved inner and outer cones, and belongs to profile class M. The pulsar was observed as part of the Meterwavelength Single-pulse Polarimetric Emission Survey (MSPES, Mitra et al 2016). The pulsar exhibited subpulse drifting whose average behaviour was reported in Basu et al (2016).…”

Characterizing the nature of subpulse drifting in pulsars

“…The Meterwavelength Single-pulse Polarimetric Emission Survey (MSPES, Mitra et al 2016) was carried out to study the radio emission properties of 123 pulsars. Basu et al (2016) conducted fluctuation spectral studies to characterise the periodic subpulse behaviour in these pulsars.…”

5.0 GHz TMRT Observations of 71 Pulsars

“…At low frequencies, this well-known pulsar has a mutiple-component profile with a strong central or core component. Five components are distinguished clearly in the profile at frequencies around 300 MHz (Mitra et al 2016a). The second and central components started merging with each other at 410 MHz and 610 MHz (Gould & Lyne 1998;Mitra et al 2016a).…”

“…Five components are distinguished clearly in the profile at frequencies around 300 MHz (Mitra et al 2016a). The second and central components started merging with each other at 410 MHz and 610 MHz (Gould & Lyne 1998;Mitra et al 2016a). At frequencies above 1 GHz, all components are merged and have about the same amplitude, giving the profile a flat-topped appearance (e.g., Johnston & Kerr 2018).…”