"Faster-than-Light" Pulse Propagation in the Interstellar Medium and Evidence for Birefringence

Details "Faster-than-Light" Pulse Propagation in the Interstellar Medium and Evidence for Birefringence "Faster-than-Light" Pulse Propagation in the Interstellar Medium and Evidence for Birefringence

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21923710a&link_type=abstract

American Astronomical Society, AAS Meeting #219, #237.10

Astronomy and Astrophysics

Astronomy

Scientific paper

Radiation from radio pulses are known to experience dispersion due to free electrons in the ISM: low frequencies are delayed relative to high frequencies. A very different kind of dispersion is theoretically predicted from the 1420.4 MHz resonance of the ISM's neutral hydrogen. This "anomalous dispersion” makes the group velocity of the pulses larger than the vacuum speed of light. Furthermore, in the presence of a magnetic field this effect will be different for the left and right polarization modes of the pulses. Evidence for superluminal pulses was first found in observations of PSR B1937+21 two years ago. Here, we present followup observations of this pulsar that confirm the detection, show evidence of birefringence, and allow an estimate of the average magnetic field strength.

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