High Spatial Resolution Observations of CO in CRL 618

Details High Spatial Resolution Observations of CO in CRL 618 High Spatial Resolution Observations of CO in CRL 618

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...415..708s&link_type=abstract

Astrophysical Journal v.415, p.708

Astronomy and Astrophysics

Astronomy

13

Ism: Kinematics Andy Dynamics -- Planetary Nebulae: Individual (Crl 618) -- Radio Lines: Ism

Scientific paper

We have made aperture synthesis observations of the very young planetary nebula CRL 618 by 12CO J = 1-0 line and continuum at 115.271 GHz with the Nobeyama Millimeter Array. The maps with the angular resolution of 3"6 x 3"5 show strong concentration of CO toward the ionized core with no clear evidence of a toroidal structure around the star nor along the axis of visible bipolar lobes. Velocity-channel maps show complex structures characterized by a spheroidal component weakly elongated to the east-west direction and a horn-like feature which looks to be spread from the center in a narrow opening angle. It seems difficult to interpret the maps by the simple model with a smooth outflow. The disk structure does not show up in our observation because of the smallness of the disk or obscuring by the surrounding thick spherical CO gas. We detected the red wing component of a high-velocity outflow but not the blue wing component. The red wing arises from the compact region, within 2" from the ionized core, and suggests that the high-velocity outflow occurs in a compact region centered on the ionized core. The 115 GHz continuum emission has been detected with the total flux density of 1.48 Jy and it is a point source centered on the ionized core.

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