Westerbork observations of 6 CM H2CO in the direction of CAS A

Details Westerbork observations of 6 CM H2CO in the direction of CAS A Westerbork observations of 6 CM H2CO in the direction of CAS A

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139..317g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 2, Oct. 1984, p. 317-329.

Astronomy and Astrophysics

Astronomy

34

Cassiopeia A, Formaldehyde, Molecular Clouds, Radio Astronomy, Absorption Spectra, Carbon Monoxide, Centimeter Waves, Continuous Spectra, Optical Thickness

Scientific paper

The 6 cm 110 - 111 H2CO absorption in the Perseus arm feature in the direction of Cas A has been mapped with the Westerbork Synthesis Radio Telescope (WSRT). Only a small part of Cas A is absorbed. In agreement with the 2 cm 211-212 results of Batrla et al. (1983), there is no H2CO absorption in the northern half of Cas A. The low optical depths measured with single dish telescopes (≤0.06) are due to small filling factors in a clumpy medium. With higher angular resolution optical depths of ≡1 are observed. These clumps have H2 densities of ≡104cm-3, sizes in the range 0.1 - 0.4 pc and total masses in the range 0.2 - 66 M_sun;. A comparison with CO and H I absorption observations has been carried out. Twelve of the H2CO clumps have possible H I counterparts.

Affiliated with

Also associated with

No associations

Rating

Westerbork observations of 6 CM H2CO in the direction of CAS A does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Westerbork observations of 6 CM H2CO in the direction of CAS A, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Westerbork observations of 6 CM H2CO in the direction of CAS A will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1226404