High-Resolution Observations of the CO Gas Surrounding the Core of CRL 618

Details High-Resolution Observations of the CO Gas Surrounding the Core of CRL 618 High-Resolution Observations of the CO Gas Surrounding the Core of CRL 618

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...467..341h&link_type=abstract

Astrophysical Journal v.467, p.341

Astronomy and Astrophysics

Astronomy

16

Ism: Individual Alphanumeric: Crl 618, Ism: Jets And Outflows, Radio Lines: Ism, Stars: Agb And Post-Agb

Scientific paper

Recently acquired CO(1-0) observations at 115 GHz with the Owens Valley Radio Observatory have revealed the presence of previously undetected material surrounding CRL 618. The observations have a beam size of 2".0 x 1".6 and are more sensitive than any interferometric observations of the source thus far. Our maps reveal the presence of a circular emission region with a radius of ≍15" surrounding the core of CRL 618. It is probable that this halo structure is a shell of ejecta from the progenitor of CRL 618, which underwent a period of significant mass loss while ascending the asymptotic giant branch. The CO halo is clumpy and surrounds the bright molecular core of CRL 618, possibly shaping the core's weak bipolar appearance. As in the case of the CS line we have previously observed, the spectral profile of the CO line is similar to a P Cygni feature. The morphology of the absorption feature is that of a point source centered close to, but not coincident with the H II position. In addition, we have imaged the high-velocity outflow from the core, and we find that the redshifted and blueshifted emission comes from point sources that are distinctly separated, with the redshifted lobe west of the blueshifted lobe.

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