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| Paper: |
Modal Sequencing in an 8-hour GMRT Observation of Pulsar B1822–09 |
| Volume: |
466, Electromagnetic Radiation from Pulsars and Magnetars |
| Page: |
103 |
| Authors: |
Latham, C.; Mitra, D.; Rankin, J. |
| Abstract: |
The research presented here examines an 8-hour observation of pulsar B1822–09,
acquired with the Giant Metrewave Radio Telescope. B1822–09 is known to
exhibit two stable emission modes, the B mode, where the precursor (PC) “turns on”,
and the Q mode, which is defined by interpulse (IP) emission. These emission modes
are like pulsar “personalities.” Our analyses have shown that the pulsar's two modes
are not as “pure” as previously thought, in that PC emission is sometimes seen in the
B mode, IP emission in Q-mode intervals and near transitions PS and IP emission can
occur simultaneously. Further, in this long observation, the Q mode shows periodic
modulation near 46.6±1.0 rotation periods that modulates both the main pulse
IP. We find indications that this represents a P3 associated with a subbeam
carousel, and that its circulation time is thrice this value. Moreover, we detected a
B-mode modulation at 70±3 that appears to have an odd-even character—thus
both cycles are commensurate at around 140 rotation periods. |
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