Decameter wavelength observations of the Rosette Nebula and the Monoceros loop supernova remnant

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Maps, Astronomical Spectroscopy, Decametric Waves, Nebulae, Radio Astronomy, Supernova Remnants, Absorption Spectra, Data Reduction, Electron Energy, Gas Temperature, H Ii Regions

Scientific paper

Observations are presented at 20.6, 25.6, and 30.9 MHz of a field containing the Rosette Nebula and the Monoceros Loop supernova remnant. From the maps presented here, it appears that radiation from the supernova remnant (SNR) is being absorbed by the Rosette Nebula, suggesting that the SNR is located behind the H II region but still within the Mon OB2 association, at a distance of ≡1.6 kpc. An electron temperature on the order of 8000K is obtained for the diffuse ionized gas in the Monoceros Loop, and it is suggested that this gas is photoionized by members of the Mon OB2 association. A mean electron temperature of 8700±1300K is derived for the Rosette Nebula.

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