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- W2014902159 abstract "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 M☉. 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." @default.
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- W2014902159 date "2002-08-20" @default.
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- W2014902159 title "Very Large Array Observations of 6 Centimeter H<sub>2</sub>CO in the Direction of Cassiopeia A" @default.
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- W2014902159 doi "https://doi.org/10.1086/341480" @default.
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