arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0902.3945astro-ph.GAastro-ph.SR
收藏

用OCRA-p观测30 GHz行星状星云

Survey of Planetary Nebulae at 30 GHz with OCRA-p

B. M. Pazderska, M. P. Gawronski, R. Feiler, M. Birkinshaw, I. W. A. Browne, R. Davis, A. J. Kus, K. Lancaster, S. R. Lowe, E. Pazderski, M. Peel, P. N. Wilkinson

摘要:

我们报告的调查结果的442行星状星云在30千兆赫。这次调查的目的是编制一份行星状星云的清单,作为今后可用于高频校准的校准源。对于41 PNe有足够的数据,我们测试的发射机制,以评估是否旋转灰尘在30 GHz的光谱中起着重要的作用。30千兆赫的数据是用托伦32米望远镜上运行的双光束差分辐射计OCRA-p获得的。在赤经和赤纬两个方向上扫描源。我们估计在30 GHz的磁通密度使用自由-自由发射模型,并与我们的数据进行比较。主要结果是一个目录,其中包含93个行星状星云在30 GHz的通量密度。源有足够的数据进行了比较的光谱模型的自由-自由的排放。该模型表明,自由-自由发射一般可以解释在30 GHz的观测到的通量密度,因此不需要其他的发射机制来解释高频光谱。

英文摘要:

We report the results of a survey of 442 planetary nebulae at 30 GHz. The purpose of the survey is to develop a list of planetary nebulae as calibration sources which could be used for high frequency calibration in future. For 41 PNe with sufficient data, we test the emission mechanisms in order to evaluate whether or not spinning dust plays an important role in their spectra at 30 GHz. The 30-GHz data were obtained with a twin-beam differencing radiometer, OCRA-p, which is in operation on the Torun 32-m telescope. Sources were scanned both in right ascension and declination. We estimated flux densities at 30 GHz using a free-free emission model and compared it with our data. The primary result is a catalogue containing the flux densities of 93 planetary nebulae at 30 GHz. Sources with sufficient data were compared with a spectral model of free-free emission. The model shows that free-free emission can generally explain the observed flux densities at 30 GHz thus no other emission mechanism is needed to account for the high frequency spectra.

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。

↑