Westerbork 6-cm observations of H2CO: absorption in the direction of W49A
Open Access
- 1 July 1985
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 215 (2) , 197-209
- https://doi.org/10.1093/mnras/215.2.197
Abstract
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 5×104 cm−3, resulting in a mass of ∼103M⊙ (based on a formaldehyde to molecular hydrogen ratio of 2×10−9).Keywords
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