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arXiv 0707.2640astro-ph
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B335在毫米波连续谱和226 GHz H2CO谱线上的观测

Observations of B335 in the Millimeter Continuum and the 226 GHz H2CO Line

Minho Choi

摘要:

原恒星B335是在1.3毫米的连续谱线和H2 CO 312 - 211谱线上观测到的,角分辨率约为8角秒。由尘埃连续辐射探测到的内包层质量约为0.02 Msun。原恒星位置的H2 CO光谱显示出蓝色倾斜的双峰轮廓,这表明内包层的运动学特征主要是下沉运动。然而,当蓝移峰和红移峰分别成像时,最大位置之间有一个小的东西位移。这种位移表明,H2 CO排放的一部分可能来自流出的气体。本文讨论了降落包层和出流对辐射转移的联合作用。这种效应可以使线轮廓不对称性比从仅入轨模型中预期的更精确。

英文摘要:

The protostar B335 was observed in the 1.3 mm continuum and in the H2CO 312 - 211 line with an angular resolution of about 8 arcsec. The mass of the inner envelope detected by the dust continuum emission is about 0.02 Msun. The H2CO spectrum at the protostellar position shows a blue-skewed double peak profile, suggesting that the kinematics of the inner envelope is dominated by infall motion. When the blueshifted and the redshifted peaks were imaged separately, however, there is a small east-west displacement between the maximum positions. This displacement suggests that some part of the H2CO emission might come from the outflowing gas. A combined effect of the infalling envelope and the outflow on the radiative transfer is discussed. This effect can make the line profile asymmetry severer than what is expected from infall-only models.

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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