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arXiv 0707.4035astro-ph
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CO J=6-5线原行星状星云CRL 618的亚毫米阵列观测

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

Jun-ichi Nakashima, David Fong, Tatsuhiko Hasegawa, Naomi Hirano, Nico Koning, Sun Kwok, Jeremy Lim, Dinh-Van-Trung, Ken Young

摘要:

本文报道了用亚毫米波射电阵列对原行星状星云CRL 618进行的12 CO J=6-5谱线干涉观测的结果。由于SMA的新功能使我们能够同时使用两个接收器,我们还同时在12 CO J=2-1和13 CO J=2-1谱线上进行了观测。12 CO J=6-5和13 CO J=2-1的谱线首先在CRL 618方向上被干涉观测到。~(12)CO J=6-5谱线的高速分量通量几乎完全恢复,而低速分量的通量约有80%被分辨出来。低回收率表明~(12)CO J=6-5线低速分量的发射区被大大扩展。在230和690 GHz处都检测到连续发射。690 GHz连续辐射的通量似乎被部分解析出来,这表明尘埃辐射部分污染了690 GHz连续辐射通量。在12 CO J=2-1谱线的观测中已经证实的空洞结构在12 CO J=6-5谱线中没有被清楚地探测到,并且只探测到空洞的南壁。这一结果表明,CRL 618的分子包膜的物理条件并不是完全轴对称的。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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