arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.0052astro-ph.GA
收藏

小麦哲伦云中FIR/RADIO连续谱相关的分析

An analysis of the FIR/RADIO Continuum Correlation in the Small Magellanic Cloud

Howard Leverenz, Miroslav D. Filipović

摘要:

研究了小麦哲伦云(SMC)远红外(FIR)辐射和射电连续谱(RC)辐射在3 kpc到0.01 kpc尺度上的局地相关。在这里,我们报告良好的FIR/RC相关性下降到~15 pc。SMC中的FIR/RC发射相关性(RC/FIR)的倒数斜率在最活跃的恒星形成区域中最大,幂律斜率为~1.14,表明RC发射比FIR发射增加得更快。其他区域和SMC的斜率要平坦得多,在0.63 - 0.85的范围内。斜率倾向于遵循范围从0.5到0.95的区域的热分数。单独的RC发射的热分数可以提供预期的FIR/RC相关性。结果与紫外线(UV)光子加热尘埃和宇宙射线电子(CRe-s)扩散远离恒星形成区域的共同来源一致。由于CRe-s似乎很容易逸出SMC,因此此处的结果可能不支持局部气体密度和磁场强度之间的耦合。

英文摘要:

The local correlation between far-infrared (FIR) emission and radio-continuum (RC) emission for the Small Magellanic Cloud (SMC) is investigated over scales from 3 kpc to 0.01 kpc. Here, we report good FIR/RC correlation down to ~15 pc. The reciprocal slope of the FIR/RC emission correlation (RC/FIR) in the SMC is shown to be greatest in the most active star forming regions with a power law slope of ~1.14 indicating that the RC emission increases faster than the FIR emission. The slope of the other regions and the SMC are much flatter and in the range of 0.63-0.85. The slopes tend to follow the thermal fractions of the regions which range from 0.5 to 0.95. The thermal fraction of the RC emission alone can provide the expected FIR/RC correlation. The results are consistent with a common source for ultraviolet (UV) photons heating dust and Cosmic Ray electrons (CRe-s) diffusing away from the star forming regions. Since the CRe-s appear to escape the SMC so readily, the results here may not provide support for coupling between the local gas density and the magnetic field intensity.

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。

↑