Are the infrared-faint radio sources pulsars?
  Infrared-Faint Radio Sources (IFRS) are objects which are strong at radio
wavelengths but undetected in sensitive Spitzer observations at infrared
wavelengths. Their nature is uncertain and most have not yet been associated
with any known astrophysical object. One possibility is that they are radio
pulsars. To test this hypothesis we undertook observations of 16 of these
sources with the Parkes Radio Telescope. Our results limit the radio emission
to a pulsed flux density of less than 0.21 mJy (assuming a 50% duty cycle).
This is well below the flux density of the IFRS. We therefore conclude that
these IFRS are not radio pulsars.
