No detectable radio emission from the magnetar-like pulsar in Kes 75

May, 2008
15 pages
Published in:
  • Astrophys.J. 688 (2008) 550
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2009201320172021202401234567
Abstract: (arXiv)
The rotation-powered pulsar PSR J1846-0258 in the supernova remnant Kes 75 was recently shown to have exhibited magnetar-like X-ray bursts in mid-2006. Radio emission has not yet been observed from this source, but other magnetar-like sources have exhibited transient radio emission following X-ray bursts. We report on a deep 1.9GHz1.9 \text{GHz} radio observation of PSR J1846-0258 with the 100-m Green Bank Telescope in late 2007 designed to search for radio pulsations or bursts from this target. We have also analyzed three shorter serendipitous 1.4GHz1.4 \text{GHz} radio observations of the source taken with the 64-m Parkes telescope during the 2006 bursting period. We detected no radio emission from PSR J1846-0258 in either the Green Bank or Parkes datasets. We place an upper limit of 4.9μJy4.9 \mu\text{Jy} on coherent pulsed emission from PSR J1846-0258 based on the 2007 November 2 observation, and an upper limit of 27μJy27 \mu\text{Jy} around the time of the X-ray bursts. Serendipitously, we observed radio pulses from the nearby RRAT J1846-02, and place a 90% confidence level upper limit on its period derivative of 7.3×10147.3\times 10^{-14}, implying its surface dipole magnetic field is less than 1.7×1013G1.7\times 10^{13} \text{G}.
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