High Resolution Observations of the Orion Nebula at 408 MHz

Abstract

The Orion Nebula has been observed at 408 MHz with the 1 mile Cross radio telescope at the Molonglo Radio Observatory. NGC 1976 and NGC 1982 were observed separately and the former was well resolved.. Comparison with high frequency results shows that the central region is opti('ally thick; the electron temperature was measured directly at 7 6000K ± 800 degK. Both nebulae are strongly concentrated towards their exciting stars..