Very Large Array Observations of 6 Centimeter H2CO in the Direction of Cassiopeia A

Details Very Large Array Observations of 6 Centimeter H2CO in the Direction of Cassiopeia A Very Large Array Observations of 6 Centimeter H2CO in the Direction of Cassiopeia A

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...575..871r&link_type=abstract

The Astrophysical Journal, Volume 575, Issue 2, pp. 871-885.

Astronomy and Astrophysics

Astronomy

13

Ism: Dust, Extinction, Ism: Clouds, Ism: Individual: Name: Cassiopeia A, Ism: Molecules, Ism: Supernova Remnants

Scientific paper

H2CO observations in the 110-111 transition (6 cm) obtained with the Very Large Array in the direction of the supernova remnant Cas A are presented. Absorption images are obtained with a resolution of 6" and a sensitivity of <~0.003. Molecular structures in the Perseus arm are observed between -34 and -49 km s-1. The distribution of the molecular gas is significantly clumpy. Seventy-two clumps could be identified, with sizes of 0.17+/-0.05 pc, densities between 0.3 and 14×104 cm-3, and masses below 10 Msolar. In agreement with previous studies, most of the clumps, if not all, appear to be dispersing. The high H2 column density to the west of Cas A accounts for the lack of optical emission in this region. Moreover, the optical extinction, estimated to be 8 mag toward the expansion center of Cas A, might explain why the supernova explosion was not observed in the 17th century. A major objective of the present survey is to search for signs of a possible interaction between Cas A and a western cloud. A striking correlation between the continuum emission and the H2CO absorption distribution, and slight spectral broadenings toward the west, are the only evidence that may suggest that Cas A is interacting with an external cloud. However, the evidence is not enough to draw any definitive conclusion.

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