WSRT and VLA Observations of the 6 cm and 2 cm lines of H_2CO in the direction of W 58 C1 (ON3) and W 58 C2

Details WSRT and VLA Observations of the 6 cm and 2 cm lines of H_2CO in the direction of W 58 C1 (ON3) and W 58 C2 WSRT and VLA Observations of the 6 cm and 2 cm lines of H_2CO in the direction of W 58 C1 (ON3) and W 58 C2

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000adil...hd...01d&link_type=abstract

NCSA Astronomy Digital Image Library

Astronomy and Astrophysics

Astronomy

Scientific paper

Absorption in the J_{K_-,K_+} = 211-212 transition of formaldehyde at 2 cm towards the ultracompact HII regions C1 and C2 of W 58 has been observed with the Very Large Array with an angular resolution of 0.2'' and a velocity resolution of 1 km/s. The high resolution continuum image of C1 (also known as ON 3) shows a partial shell which opens to the NE. Strong H_2CO absorption is observed against W 58 C1. The highest optical depth, tau > 2, occurs in the SW portion of C1 near the edge of the shell, close to the continuum peak. The absorption is weaker towards the nearby, more diffuse compact HII region C2, tau < 0.3. The H_2CO velocity (-21.2 km/s) towards C1 is constant and agrees with the velocity of CO emission, mainline OH masers, and the H76 alpha recombination line, but differs from the velocity of the 1720 MHz OH maser emission ( -$13 km/s). [The WSRT 6 cm H_2CO data is not included - only the mean profile from an earlier publication-figure was used in conjunction with the mean VLA 2 cm H_2CO profile to derive mean H_2 densities and H_2CO column densities.]

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