The massive binary system WR 11 ( \gamma ^ { 2 } -Velorum ) has been recently proposed as the counterpart of a Fermi source .
If this association is correct , this system would be the second colliding wind binary detected in GeV \gamma -rays .
However , the reported flux measurements from 1.4 to 8.64 GHz fail to establish the presence of non-thermal ( synchrotron ) emission from this source .
Moreover , WR 11 is not the only radio source within the Fermi detection box .
Other possible counterparts have been identified in archival data , some of which present strong non-thermal radio emission .

We conducted arcsec-resolution observations towards WR 11 at very low frequencies ( 150 to 1400 MHz ) where the non-thermal emission –if existent and not absorbed– is expected to dominate , and present a catalog of more than 400 radio-emitters , among which a significant part is detected at more than one frequency , including limited spectral index information .
Twenty-one of them are located within the Fermi significant emission .
A search for counterparts for this last group pointed at MOST 0808–471 , a source 2 ’ away from WR 11 , as a promising candidate for high-energy emission , with resolved structure along 325 – 1390 MHz .
For it , we reprocessed archive interferometric data up to 22.3 GHz and obtained a non-thermal radio spectral index of -0.97 \pm 0.09 .
However , multiwavelength observations of this source are required to establish its nature and to assess whether it can produce ( part of ) the observed \gamma -rays .

WR 11 spectrum follows a spectral index of 0.74 \pm 0.03 from 150 MHz to 230 GHz , consistent with thermal emission .
We interpret that any putative synchrotron radiation from the colliding-wind region of this relatively short-period system is absorbed in the photospheres of the individual components .
Notwithstanding , the new radio data allowed to derive a mass loss rate of 2.5 \times 10 ^ { -5 } M _ { \sun } ~ { } { yr } ^ { -1 } , which , according to the latest models for \gamma -ray emission in WR 11 , would suffice to provide the required kinetic power to feed non-thermal radiation processes .