Implications of a VLBA parallax for PSR B0656+14

A. Golden, W. F. Brisken, S. E. Thorsett, R. A. Benjamin, W. M. Goss

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Using the VLBA we have determined the parallax of the radio pulsar PSR B0656+14 to be π = 3.47±0.36 mas, yielding a distance of 288 -27+33 pc. This constrains existing models of thermal X-ray emission from the neutron star's photosphere yielding R ∼7-8.5 km for simple blackbody models, and radii between ∼13 and ∼20 km with more realistic fits to a magnetized hydrogen atmosphere. Astrometric and age constrains argue in favor of a definite association with the Monogem Ring SNR. The latter's distance and age are consistent with the predictions of a model for the primary cosmic ray energy spectrum in which the 'knee' feature is produced by a single dominant source.

Original languageEnglish (US)
Pages (from-to)436-439
Number of pages4
JournalBaltic Astronomy
Issue number3
StatePublished - Dec 1 2005


  • Cosmic rays
  • ISM: supernova remnants, individual: Monogem Ring
  • Pulsars: individual: PSR b0656+14


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