Observations of the Rosette Nebula using the decameter wave radio telescope at Gauribidanur.

Abstract

A map of Rosette Nebula in continuum absorption, made at 34.5 MHz using the Decameter Wave Radio Telescope at Gauribidanur, India, with a resolution of 26 min x 40 min, is presented. These observations are combined with the 2700 MHz measurements of Graham et al. (1982) to derive the electron temperature distribution across the nebula. It is found that the temperatures in the southeastern parts of the nebula are around 5000 K and increase up to 8000 K towards the northwestern regions. It is suggested that the lower electron temperatures in the southeastern regions are due to the presence of more dust there compared to other regions in the nebula.