Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21631507m&link_type=abstract
American Astronomical Society, AAS Meeting #216, #315.07; Bulletin of the American Astronomical Society, Vol. 41, p.895
Astronomy and Astrophysics
Astronomy
Scientific paper
The mechanism of pulsar coherent radio emission is yet unknown. Current observations and theoretical developments suggest that the radiation emerging from the pulsar magnetosphere consist of extraordinary waves polarized perpendicular to the pulsar magnetic field. However, the fundamental question whether these waves are excited by maser-type or coherent curvature radiation, remains open. Recently Mitra, Gil, Melikidze (2009) has presented high quality single pulse polarimetry to chose between these two alternatives. These subpulses are strong and show extremely high linear polarization with the position angle closely following the mean position angle traverse. This crucial observational is used to argue in favour of coherent curvature emission mechanism, excluding the maser mechanism.
While the gross picture seem to be correct, there are several more observational features that need to be understood before one can be certain about the emission mechanism. This talk will focus on various such observational aspects based on high sensitive single pulse polarimetric data, and discuss the constrain that they put on coherent curvature radiation as an excitation mechanism for the pulsar radio emission.
Gil Janusz
Melikidze George
Mitra Dipanjan
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