Kavli Affiliate: Kejia Lee
| First 5 Authors: , , , ,
| Summary:
We use the Five-hundred-meter Aperture Spherical radio Telescope to observe
the bright millisecond pulsar PSR B1937+21 (J1939+2134) and record the data in
the band from 1.0 to 1.5 GHz. We measure the neutral hydrogen (HI) emission and
absorption lines near 1420 MHz ($lambda simeq 21$ cm). We derive the
kinematic distance of the pulsar with the HI observation. By comparing this
with the archival absorption spectra observed decades ago, we notice possible
variations in the absorption spectra toward this pulsar, which correspond to a
possible tiny-scale atomic structure of a few astronomical units in size. We
also verify the apparent faster-than-light anomalous dispersion at the HI
absorption line of this pulsar previously reported.
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