PSR J1841―0500: A RADIO PULSAR THAT MOSTLY IS NOT THERE

In a search for radio pulsations from the magnetar 1E 1841-045, we have discovered the unrelated pulsar J1841-0500, with rotation period P = 0.9 s and characteristic age 0.4 Myr. One year after discovery with the Parkes telescope at 3 GHz, radio emission ceased from this bright pulsar. After 580 day...

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Bibliographic Details
Published in:The Astrophysical journal 2012-02, Vol.746 (1), p.1-7
Main Authors: CAMILO, F, RANSOM, S. M, CHATTERJEE, S, JOHNSTON, S, DEMOREST, P
Format: Article
Language:English
Subjects:
Astronomy
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Dispersions
Earth, ocean, space
Exact sciences and technology
Interstellar matter
Line of sight
MAGNETIC FIELDS
PULSARS
Pulsation
PULSATIONS
Radio
Radio emission
ROTATION
TELESCOPES
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Summary:In a search for radio pulsations from the magnetar 1E 1841-045, we have discovered the unrelated pulsar J1841-0500, with rotation period P = 0.9 s and characteristic age 0.4 Myr. One year after discovery with the Parkes telescope at 3 GHz, radio emission ceased from this bright pulsar. After 580 days, emission resumed as before. The P during both on states is 250% of the average in the off state. PSR J1841-0500 is a second example of an extremely intermittent pulsar, although with a much longer off period and larger ratio of spin-down rates than PSR B1931+24. The new pulsar is hugely scattered by the interstellar medium, with a fitted timescale referenced to 1 GHz of [tau] sub(1) = 2 s. Based on polarimetric observations at 5 GHz with the Green Bank Telescope, the intrinsic pulse profile has not obviously changed between the two on states observed so far, although relatively small variations cannot be excluded. The magnitude of its rotation measure is the largest known, RM = -3000 rad m super(-2), and with a dispersion measure DM = 532 pc cm super(-3) implies a large electron-weighted average magnetic field strength along the line of sight, 7 mu G.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/746/1/63