Periodic and Phase-locked Modulation in PSR B1929+10 Observed with FAST

Abstract

We present a detailed single-pulse analysis for PSR B1929+10 based on observations with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The main pulse and interpulse are found to be modulated with a periodicity of $\sim 12$ times the pulsar's rotational period ($P$). The $\sim 12P$ modulation is confirmed as a periodic amplitude modulation instead of systematic drifting. The periodic amplitude modulation in the IP is found to be anti-correlated with that in the weak preceding component of the MP (MP_I), but correlated with that in the first two components of the MP (MP_II), which implies that the modulation patterns in the IP and the MP are phase-locked. What is more interesting is that the modulation in MP_II is delayed that in the IP by about 1P. Furthermore, high sensitivity observations by FAST reveal that weak emission exists between the MP and the IP. In addition, we confirm that the separation between the IP and the MP is independent of radio frequency. The above results are a conundrum for pulsar theories and cannot be satisfactorily explained by the current pulsar models. Therefore, our results observed with FAST provide an opportunity to probe the structure of pulsar emission and the neutron star's magnetosphere.

13 pages 12 figures

References in corpus (12)

• PSRCHIVE and PSRFITS An Open Approach to Radio Pulsar Data Storage and Analysis
• The Five-Hundred-Meter Aperture Spherical Radio Telescope (FAST) Project
• The Fundamental Performance of FAST with 19-beam Receiver at L Band
• Meterwavelength Single-pulse Polarimetric Emission Survey II: The phenomenon of Drifting Subpulses
• Meterwavelength Single-pulse Polarimetric Emission Survey III: The Phenomenon of Nulling in Pulsars
• Periodic Modulation : Newly emergent emission behaviour in Pulsars
• On the pulse--width statistics in radio pulsars. I. Importance of the interpulse emission
• The main- interpulse interaction of PSR B1702-19
• Periodic mode changing in PSR J1048-5832
• Periodic Q-mode modulation in PSR J1825$-$0935 (PSR B1822$-$09)
• Radio emission features in different modes of PSR J0826+2637 (B0823+26)
• Toward an Empirical Theory of Pulsar Emission. X. On the Precursor and Postcursor Emission

Cited by in corpus (8)

• FAST observations of an extremely active episode of FRB 20201124A: IV. Spin Period Search
• The Thousand-Pulsar-Array programme on MeerKAT -- VIII. The subpulse modulation of 1198 pulsars
• A single pulse study of a millisecond pulsar PSR J0621+1002
• Spectral variation across Pulsar Profile due to Coherent Curvature Radiation
• High-altitude Magnetospheric Emissions from Two Pulsars
• Radio emission across the entire rotation phases of pulsars
• Cosmology from Strong Interactions
• Main and interpulse interaction in PSRs J1842+0358 and J1926+0737: evidence for interpole communication