arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1803.04888astro-ph.GA
收藏

通过AKARI红外全天空巡天看可能的微波尘埃发射

A look at possible microwave dust emission via AKARI infrared all-sky surveys

Aaron C. Bell, Takashi Onaka, Yasuo Doi, Frédéric Galliano, Ronin Wu, Hidehiro Kaneda, Daisuke Ishihara, Martin Giard

摘要:

异常微波发射(AME)仍然缺乏一个结论性的解释。这种过量的辐射,大约在10到50 GHz之间,在空间上与星际尘埃相关,促使人们提出一个“旋转尘埃”假说:快速旋转的小尘埃颗粒的电偶极子辐射。AME曲线的典型峰值频率范围涉及约1 nm量级的颗粒,表明多环芳烃分子(PAH)。我们比较AKARI/红外相机(IRC),其全面的PAH波段覆盖,AME强度估计从普朗克合作,在λ猎户座地区。我们还将研究来自其他中红外和远红外波段的红外尘埃辐射。这里的结果和讨论适用于大约1°的角标度。总的来说,我们的研究结果支持一个从灰尘的AME-from-dust假说。在λ Orionis中,我们发现尘埃质量与AME确实相关,并且AKARI/IRC 9 μm波段中与PAH相关的排放可能稍微更强一些。

英文摘要:

The anomalous microwave emission (AME) still lacks a conclusive explanation. This excess of emission, roughly between 10 and 50 GHz, correlates spatially with interstellar dust, prompting a "spinning dust" hypothesis: electric dipole emission by rapidly rotating, small dust grains. The typical peak frequency range of the AME profile implicates grains on the order of ~1 nm, suggesting polycyclic aromatic hydrocarbon molecules (PAHs). We compare AKARI/Infrared Camera (IRC), with its thorough PAH-band coverage, to AME intensity estimates from the Planck Collaboration, in the λ Orionis region. We look also at infrared dust emission from other mid IR and far-IR bands. The results and discussion contained here apply to an angular scale of approximately 1°. In general, our results support an AME-from-dust hypothesis. In λ Orionis, we find that certainly dust mass correlates with AME, and that PAH-related emission in the AKARI/IRC 9 μm band may correlate slightly more strongly.

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。

↑