86 and 140 GHz radiocontinuum maps of the Cassiopeia A SNR

Details 86 and 140 GHz radiocontinuum maps of the Cassiopeia A SNR 86 and 140 GHz radiocontinuum maps of the Cassiopeia A SNR

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...347..258l&link_type=abstract

Astronomy and Astrophysics, v.347, p.258-265 (1999)

Astronomy and Astrophysics

Astrophysics

20

Ism: Abundances, Ism: Molecules, Ism: Supernova Remnants, Radio Continuum: Ism

Scientific paper

MM-wave continuum emission from the Cassiopeia A SNR was mapped at 86 and 140 GHz using an on-the-fly beam-switching technique at NRAO's 12m telescope on Kitt Peak. Global nebular mm-wave fluxes follow quite well the S_ν ~ nu (-0.77) behaviour established previously at frequencies of 1-23 GHz and vary as S_ν ~ nu (-0.763+/-0.008) over the entire range 1-140 GHz. The 86 GHz excess found earlier by \citet{KenDen85} is not confirmed. As suggested by \citet{LisLuc95} and as shown by the transition from off-source emission to on-source absorption in the HCO(+) J=1-0 line, the mm-wave radiocontinuum is too feeble to permit reliable mm-wave absorption line spectroscopy using small singledish mm-wave radiotelescopes. ^12CO J=2-1 and ^13CO J=1-0 emission around the nebula was mapped more fully than was previously available. There is no striking evidence which would suggest an interaction between the SNR and ambient neutral gas.

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