With the Expanded Long Wavelength Array ( ELWA ) and pulsar binning techniques , we searched for off-pulse emission from PSR B0950+08 at 76 MHz .
Previous studies suggest that off-pulse emission can be due to pulsar wind nebulae ( PWNe ) in younger pulsars .
Other studies , such as that done by Basu et al .
( 2012 ) , propose that in older pulsars this emission extends to some radius that is on the order of the light cylinder radius , and is magnetospheric in origin .
Through imaging analysis we conclude that this older pulsar with a spin-down age of 17 Myr has a surrounding PWN , which is unexpected since as a pulsar ages its PWN spectrum is thought to shift from being synchrotron to inverse-Compton-scattering dominated .
At 76 MHz , the average flux density of the off-pulse emission is 0.59 \pm 0.16 Jy .
The off-pulse emission from B0950+08 is \sim 110 \pm 17 arcseconds ( 0.14 \pm 0.02 pc ) in size , extending well-beyond the light cylinder diameter and ruling out a magnetospheric origin .
Using data from our observation and the surveys VLSSr , TGSS , NVSS , FIRST , and VLASS , we have found that the spectral index for B0950+08 is about -1.36 \pm 0.20 , while the PWN ’ s spectral index is steeper than -1.85 \pm 0.45 .