Submillimeter Array Observation of the Proto-Planetary Nebula CRL 618 in the CO J=6-5 Line

Abstract

We report on the results of a Submillimeter Array interferometric observation of the proto-planetary nebula CRL 618 in the 12CO J=6-5 line. With the new capability of SMA enabling us to use two receivers at a time, we also observed simultaneously in the 12CO J=2-1 and 13CO J=2-1 lines. The 12CO J=6-5 and 13CO J=2-1 lines were first interferometrically observed toward CRL 618. The flux of the high velocity component of the 12CO J=6-5 line is almost fully recovered, while roughly 80% of the flux of the low velocity component is resolved out. The low recovery rate suggests that the emission region of the low velocity component of the 12CO J=6-5 line is largely extended. Continuum emission is detected both at 230 and 690 GHz. The flux of the 690 GHz continuum emission seems to be partially resolved out, suggesting dust emission partly contaminates the 690 GHz continuum flux. The cavity structure, which has been confirmed in a previous observation in the 12CO J=2-1 line, is not clearly detected in the 12CO J=6-5 line, and only the south wall of the cavity is detected. This result suggests that the physical condition of the molecular envelope of CRL 618 is not exactly axial symmetric.

arXiv comment24 pages, 9 figures, 1 table, accepted for publication in AJ. Full resolution version available at http://www.asiaa.sinica.edu.tw/~junichi/paper/

References in corpus (14)

• The Submillimeter Array
• An evolutionary catalogue of Galactic post-AGB and related objects
• Magnetic-Driven Winds from Post-AGB Stars: Solutions for High Speed Winds and Extreme Collimation
• Shaping Proto-Planetary and Young Planetary Nebulae with Collimated Fast Winds
• Chemical Evolution of the Circumstellar Envelopes of Carbon-rich Post-AGB objects
• Physical conditions in the Protoplanetary Nebula CRL 618 derived from observations of vibrationally excited HCCCN
• The slowly expanding envelope of CRL618 probed with HC3N rotational ladders
• Multiple Collimated Outflows in the Proto-planetary Nebula GL 618
• FLIERs as stagnation knots from post-AGB winds with polar momentum deficiency
• Detections of SiO and H${}_2$O Masers in the Bipolar Nebula IRAS 19312+1950
• The Dying Wind Around HD 56126, A Post-AGB Carbon Star
• BIMA Array Observations of the Highly Unusual SiO Maser Source with a Bipolar Nebulosity, IRAS 19312+1950
• Detection of Bipolar Flow toward an Unusual SiO Maser Source IRAS 19312+1950
• Near-infrared polarimetric study of the bipolar nebula IRAS 19312+1950

Cited by in corpus (16)

• Outflows from Evolved Stars: The Rapidly Changing Fingers of CRL618
• Morphological Structures of Planetary Nebulae
• Herschel/HIFI observations of molecular emission in protoplanetary nebulae and young planetary nebulae
• Collimated Fast Wind in the Pre-Planetary Nebula CRL 618
• A pilot search for mm-wavelength recombination lines from emerging ionized winds in pre-planetary nebulae candidates
• Herschel/HIFI observations of high-J CO transitions in the protoplanetary nebula CRL618
• Submillimeter polarisation and magnetic field properties in the envelopes of proto-planetary nebulae CRL 618 and OH 231.8+4.2
• Multiple Fast Molecular Outflows in the PPN CRL 618
• An asymmetric jet launching model for the protoplanetary nebula CRL 618
• The Shaping of the Multipolar Pre-Planetary Nebula CRL 618 by Multi-directional Bullets
• Morpho-Kinematic Properties of the 21-Micron Source IRAS 07134+1005
• Planck intermediate results. XVIII The millimetre and sub-millimetre emission from planetary nebulae
• Steady Twin-Jets Orientation: Implications For Their Formation Mechanism
• The molecular envelope of CRL 618: A new model based on Herschel/HIFI observations
• SMA Observations of the Extended CO(6-5) Emission in the Starburst Galaxy NGC253
• A Fast bipolar H2 outflow from IRAS 16342-3814: an old star reliving its youth