Apparent Faster-than-light Pulse Propagation In Interstellar Space: A New Probe Of The Interstellar Medium

Details Apparent Faster-than-light Pulse Propagation In Interstellar Space: A New Probe Of The Interstellar Medium Apparent Faster-than-light Pulse Propagation In Interstellar Space: A New Probe Of The Interstellar Medium

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21538802j&link_type=abstract

American Astronomical Society, AAS Meeting #215, #388.02; Bulletin of the American Astronomical Society, Vol. 42, p.604

Physics

Scientific paper

Electromagnetic theory predicts that radio pulses with frequency content near the HI resonance line will undergo "anomalous dispersion." This phenomenon causes pulses to appear to travel faster-than-light. Although counter-intuitive, it does not violate the laws of causality or special relativity. We report on observations of PSR B1937+21 taken at the Arecibo Radio Observatory which show clear evidence of anomalous dispersion. Though this effect is known in laboratory physics, this is the first time it has been directly observed in an astrophysical context, and it has the potential to be a useful tool for studying the properties of neutral hydrogen in the Galaxy.

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