Westerbork 6-cm observations of H2CO - Absorption in the direction of W49A

Details Westerbork 6-cm observations of H2CO - Absorption in the direction of W49A Westerbork 6-cm observations of H2CO - Absorption in the direction of W49A

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.215..197g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 215, July 15, 1985, p. 197-209.

Astronomy and Astrophysics

Astronomy

5

Absorption Spectra, Astronomical Maps, Formaldehyde, Hydrogen Clouds, Molecular Clouds, Radio Sources (Astronomy), Abundance, Centimeter Waves, Continuous Spectra, Interstellar Masers, Opacity, Radial Velocity

Scientific paper

Using the Westerbork Synthesis Radio Telescope (WSRT), the 6-cm (110-111) H2CO absorption against the continuum source W49A (G43.2+0.0) has been mapped with an angular resolution of 3.9×24.6 arcsec2 and a velocity resolution of 0.73 km s-1. The profiles show a striking variation in shape over the 15 continuum sources; this has been interpreted as clumping of the molecular material. Evidence for two major clouds at 4 and 12 km s-1 was found; the former is only detected in absorption towards three of the continuum sources. Typical clump parameters are a size of ≡0.8 pc and a density of molecular hydrogen of 5×104cm-3, resulting in a mass of ≡103M_sun;.

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