Kavli Affiliate: Kejia Lee
| First 5 Authors: Zhengli Wang, Zhengli Wang, , ,
| Summary:
In this work, we observe the nearby pulsar, PSR B1929$+$10, using the
Five-hundred-meter Aperture Spherical radio Telescope (FAST). We find, for the
first time, two new emission components with an extremely weak observed flux
density of about $10^-4$ of the magnitude of the peak radio emission of PSR
B1929$+$10. Our results show that the intrinsic radio emission of PSR
B1929$+$10 covers the $360^circ$ of longitude, demonstrating that this
pulsar is a whole $360^circ$ of longitude emission pulsar. We find at least
15 components of pulse emission in the average pulse profile. Additionally, we
identify 5 modes of subpulse modulation in different emission regions, which
differ from the pulse components. Moreover, the narrowband emission feature and
the frequent jumps in the observed linear polarization position angle (PPA) are
also detected in the single pulse of this pulsar. To understand the
magnetosphere of this pulsar, we analyze the observed PPA variations across the
whole $360^circ$ of longitude and fit them using the classical rotating
vector model (RVM). For the best-fit model, the inclination angle,$alpha$, and
the impact angle, $beta$, of this pulsar are $55^circ.56$ and
$53^circ.47$, respectively. Using the rotating magnetosphere approximation
of the magnetic dipole field, we investigate the three-dimensional pulsar
magnetosphere and the sparking pattern on the polar cap surface. Our analysis
indicates that the extremely narrow zone of the polar cap, which is associated
with a high-altitude magnetospheric region, is responsible for the weak
emission window. This pulsar has extremely high-altitude magnetospheric radio
emissions.
| Search Query: ArXiv Query: search_query=au:”Kejia Lee”&id_list=&start=0&max_results=3