WSRT and VLA Observations of the 6 Centimeter and 2 Centimeter Lines of H2CO in the Direction of W3

Details WSRT and VLA Observations of the 6 Centimeter and 2 Centimeter Lines of H2CO in the Direction of W3 WSRT and VLA Observations of the 6 Centimeter and 2 Centimeter Lines of H2CO in the Direction of W3

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adil...hd...01d&link_type=abstract

NCSA Astronomy Digital Image Library

Astronomy and Astrophysics

Astronomy

Ism: Abundances, Ism: H Ii Regions, Ism: Individual Alphanumeric: W3, Ism: Molecules, Radio Lines: Ism

Scientific paper

Formaldehyde absorption toward the H II regions in W3 has been imaged at 6 cm with the Westerbork Synthesis Radio Telescope and at 2 cm with the Very Large array with an angular resolution of ~5 arcseconds and a velocity resolution of ~0.6 km/s. The opacities in both transitions are low, ranging between 0.05 and 0.3. The LSR velocities around -39 km/s toward the eastern component of the molecular core which includes the H II regions W3 A and W3 B and between -45 and -42 km/s toward the western component with includes W3 C and W3 D. The typical line widths are 1-3 km/s except toward the H II region W3 (FWHM ~ 5 km/s). For this source, a "champagne flow" at the edge of the molecular cloud may explain both the wide formaldehyde lines and the gradient in the recombination lines. Typical molecular hydrogen densities are ~10^5 cm^(-3), in agreement with earlier estimates from observations of other molecules. The abundance of formaldehyde relative to molecular hydrogen is (1-2) x 10^(-9) except toward W3 D where it is greater than or equal 5 x 10^(-9). The formaldehyde absorption toward the shell-like H II region W3 A is strongest toward the south/southwest edge of the coninuum source and appears to arise from a thin, compressed layer. This layer may have been compressed by the expansion of the ionized gas into part of the eastern molecular core.

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