Supernova Remnant W-44: Observations at 8350 Megacycles per Second

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Science  30 Sep 1966:
Vol. 153, Issue 3744, pp. 1633-1634
DOI: 10.1126/science.153.3744.1633


The region of W-44 was mapped at 8350 megacycles per second. The degree of linear polarization of the most intense portion of W-44 integrated over the 10.8-minute-of-arc beam was 11±2 percent at position angle 45°±5°. This high degree of polarization is further evidence that W-44 is a supernova remnant. The integrated flux density of (95±25) x 10-26 watt per square meter per cycle per second for this source is consistent with measurements at lower frequencies extrapolated with the use of a spectral index of-0.44, obtained by other observers. In addition, the compact source 3 minutes of right ascension west of W-44 was unpolarized, within the error of measurement. The flux density of (23±6)x 10-26 watt per square meter per cycle per second determined for it along with the results of other observers indicate that this source has a thermal spectrum.