Kavli Affiliate: Renxin Xu
| First 5 Authors: Zhengli Wang, Shunshun Cao, Jiguang Lu, Yulan Liu, Xun Shi
| Summary:
We report the detection of an extreme flux decrease accompanied by clear
dispersion measure (DM) and rotation measure (RM) variations for pulsar
B1929+10 during the 110-minute radio observation with the Five-hundred-meter
Aperture Spherical radio Telescope (FAST). The radio flux decreases by 2 to 3
orders of magnitude within a rapid time scale of about 20 minutes. Meanwhile,
the variations of DM and RM are approximately 0.05 pc cm$^{-3}$ and 0.7 rad
m$^{-2}$, respectively. Frequency-dependent analysis of DM indicates an
extremely weak chromatic DM feature, which does not notably affect the
radiative behavior detected. Moreover, the pulsar timing analysis shows an
additional time delay from 100 $mu$s to 400 $mu$s in the event. These results
are speculated to be due to the eclipse and bend for the radio emission of
pulsar B1929+10 by a highly dense outflow from the pulsar. This not only
impacts the intrinsic radio emission feature but also affects the pulsar timing
behavior. Nevertheless, a plasma lens effect lasting around 20 minutes could
also be responsible for the event.
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