Computer Science
Scientific paper
Feb 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..983..112r&link_type=abstract
40 YEARS OF PULSARS: Millisecond Pulsars, Magnetars and More. AIP Conference Proceedings, Volume 983, pp. 112-114 (2008).
Computer Science
1
Pulsars, Neutron Stars, Radio Telescopes And Instrumentation, Heterodyne Receivers
Scientific paper
Pulsar B0943+10 is well known for its `B' (burst) mode, characterized by accurately drifting subpulses, in contrast to its chaotic `Q' (quiet) mode. Six new Arecibo observations at 327 MHz, with durations of 2+hours each, shed considerable light on the modal dynamics of this pulsar. Of these, three were found to be exclusively `B' mode, and three were discovered to exhibit transitions from the `Q' to the `B' mode. One of these observations permitted determination of the subbeam-carousel circulation time in the `Q' mode for the first time, at some 36.4+/-0.9 stellar-rotation periods. The onset of the `B' mode was observed to commence similarly in all three observations. The initial circulation time of about 36 periods relaxed to nearly 38 periods in a roughly exponential fashion with a characteristic time of an hour-the longest characteristic time known in a mode-switching pulsar. Moreover, at `B'-mode onset the pulsar exhibits a symmetrical resolved-double profile form with a stronger trailing component; but this component slowly dies away leaving the usual single `B'-mode profile with the longitude of the magnetic axis falling at about its trailing half power point. None of this, however, elucidates how `B'- and `Q'-mode intervals alternate within an overall cycle. We report the first observations of this full modal cycle using the Westerbork telescope.
Rankin Joanna M.
Stappers Ben
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