NGC 2024 - Excitation of the dense cores

Astronomy and Astrophysics – Astronomy

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Cosmic Dust, H Ii Regions, Hydrogen Clouds, Interstellar Matter, Molecular Clouds, Near Infrared Radiation, Brightness Temperature, Molecular Spectra, Star Formation, Stellar Spectrophotometry

Scientific paper

Measurements of CS and C(S-34) J = 7-6 toward five of the six millimeter continuum sources in NGC 2024 were used to estimate the excitation temperatures and column densities of warm dense gas associated with the cores. For estimated CS source sizes of about 20 arcsec, the calculated excitation temperatures are greater than about 24 K, consistent with previous studies. A correlation between CS column density and hydrogen column density derived from the thermal dust continuum shows that it is self-consistent to assume internally heated cores and a close relationship between the characteristic temperatures of the CS-traced gas and the dust traced by the millimeter continuum. The nature of the individual sources is also discussed.

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