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The Steep Spectrum Pulsar Population

  • D. L. Kaplan (a1), .J. M. Cordes (a1) and J. J. Condon (a2)

Abstract

We have sampled the population of compact (θ ≤ 25") radio sources with spectral indices 1.5 ≤ α ≤ 3.2 (where Sv v —α) using two large scale radio surveys. This yields a statistically useful sample of 74 radio sources with S 1.4GHz ≥ 2.5 mJy and S 365MHZ ≥ 200 mJy. The majority of the sources appear to be extragalactic, resembling either high redshift radio galaxies or relic radio galaxies. However, six known pulsars were detected, as well as 16 sources of unknown nature that appear too small and have spectra too steep to be extragalactic. We are using VLBA, pulsar searching, optical/IR spectroscopy, and other techniques to definitively classify these sources. If any are new pulsars, they are potentially very interesting as they were missed by previous surveys.

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References

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