A radio source in the nebula L673

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Dust, Interstellar Matter, Nebulae, Radio Sources (Astronomy), Optical Thickness, Radio Astronomy, Radio Emission

Scientific paper

Results are reported for radio scans of the nebula L673 in Aquila performed at wavelengths of 3.5 and 4 mm. A radio source with an angular size of 2.3 arcmin in declination and a flux density of approximately 30 to 40 Jy is found to be located at right ascension 19 h 18 m 33 s + or - 2 s and declination 11 deg 7 min 30 sec (1950.0). A dense dust cloud is taken as the most likely source model, attempts are made to estimate the source parameters, and it is suggested that the cloud should be gravitationally unstable. A molecular hydrogen number density of about 3 million per cu cm and a cloud mass of approximately 1000 solar masses are obtained for an adopted distance of 300 pc.

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