arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1004.4897astro-ph.CO
收藏

NGC6946中旋转尘埃发射的微波观测

Microwave observations of spinning dust emission in NGC6946

Anna M. M. Scaife, Bojan Nikolic, David A. Green, Rainer Beck, Matthew L. Davies, Thomas M. O. Franzen, Keith J. B. Grainge, Michael P. Hobson, Natasha Hurley-W… 展开作者

Anna M. M. Scaife, Bojan Nikolic, David A. Green, Rainer Beck, Matthew L. Davies, Thomas M. O. Franzen, Keith J. B. Grainge, Michael P. Hobson, Natasha Hurley-Walker, Anthony N. Lasenby, Malak Olamaie, Guy G. Pooley, Carmen Rodriguez-Gonzalvez, Richard D. E. Saunders, Paul F. Scott, Timothy W. Shimwell, David J. Titterington, Elizabeth M. Waldram, Jonathan T. L. Zwart

摘要:

我们报告新的厘米波测量在15和18GHz之间的连续辐射的五个频率从附近的星系NGC6946的异常的“区域4”。我们发现,在这个频率范围内的发射是显着超过在8.5GHz的测量,但从15 - 18GHz的光谱一致的光学薄自由自由发射从一个紧凑的HII区域。结合以前发表的数据,我们适合四个发射模型,包含不同的连续组件使用贝叶斯频谱分析包radiospec。这些拟合表明,与其他频率的数据相结合,具有旋转灰尘成分的模型略优于具有更好的发射机制的模型。

英文摘要:

We report new cm-wave measurements at five frequencies between 15 and 18GHz of the continuum emission from the reportedly anomalous "region 4" of the nearby galaxy NGC6946. We find that the emission in this frequency range is significantly in excess of that measured at 8.5GHz, but has a spectrum from 15-18GHz consistent with optically thin free-free emission from a compact HII region. In combination with previously published data we fit four emission models containing different continuum components using the Bayesian spectrum analysis package radiospec. These fits show that, in combination with data at other frequencies, a model with a spinning dust component is slightly preferred to those that possess better-established emission mechanisms.

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。

↑