G35.2-0.74 - A molecular cloud with interesting velocity structure

Astronomy and Astrophysics – Astronomy

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Ammonia, Astronomical Spectroscopy, Molecular Clouds, Velocity Distribution, Water Masers, Astronomical Maps, Carbon Monoxide

Scientific paper

Observations of the NH3 (1, 1) and (2, 2) inversion transitions made with a 2.3-arcmin beam reveal the molecular cloud G35.2-0.74 to possess an interesting velocity structure. To the north, near an H2O maser, the source is observed as a single component. To the south, around a red nebulosity, the NH3 spectra are split into two components with a separation 3 km/s. This splitting is of significance because it represents very clear evidence that, in this cloud at least, systematic velocity motion is an important factor in determining the observed velocity dispersion.

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