Constraining the Vela Pulsar's Radio Emission Region Using Nyquist-Limited Scintillation Statistics. (arXiv:1208.5485v1 [astro-ph.SR]):
Using a novel technique, we achieve ~100 picoarcsecond resolution and set an
upper bound of less than 4 km for the characteristic size of the Vela pulsar's
emission region. Specifically, we analyze flux-density statistics of the Vela
pulsar at 760 MHz. Because the pulsar exhibits strong diffractive
scintillation, these statistics convey information about the spatial extent of
the radio emission region. We measure both a characteristic size of the
emission region and the emission sizes for individual pulses. Our results imply
that the radio emission altitude for the Vela pulsar at this frequency is less
than 340 km.
No comments:
Post a Comment