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arXiv 1111.6252astro-ph.COastro-ph.GA
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用Herschel和Spitzer解算近星系射电- FIR相关

The Resolved Radio--FIR Correlation in Nearby Galaxies with Herschel and Spitzer

Fatemeh S. Tabatabaei, Eva Schinnerer, Eric Murphy, Rainer Beck, Annie Hughes, Brent Groves, the KINGFISH Team

摘要:

我们调查的远红外(FIR)和无线电连续辐射从NGC 6946之间的空间尺度0.9和17千秒差距的相关性。我们使用来自KINGFISH项目的Herschel PACS(70,100,160 $μ$ m)和SPIRE(250 $μ$ m)数据。通过分离射电连续辐射的自由-自由和同步辐射分量,我们发现远红外辐射与自由-自由辐射的相关性比同步辐射的好。与M33和M31的相似研究相比,我们发现NGC 6946的同步辐射-FIR关联的尺度依赖性更接近于M31而不是M33。同步辐射-远红外相关的尺度依赖性可以用有序磁场比来解释,也可以用宇宙线电子在这些星系中的扩散长度来解释。

英文摘要:

We investigate the correlation between the far-infrared (FIR) and radio continuum emission from NGC6946 on spatial scales between 0.9 and 17 kpc. We use the Herschel PACS (70, 100, 160$μ$m) and SPIRE (250$μ$m) data from the KINGFISH project. Separating the free-free and synchrotron components of the radio continuum emission, we find that FIR is better correlated with the free-free than the synchrotron emission. Compared to a similar study in M33 and M31, we find that the scale dependence of the synchrotron--FIR correlation in NGC6946 is more similar to M31 than M33. The scale dependence of the synchrotron--FIR correlation can be explained by the turbulent-to-ordered magnetic field ratio or, equivalently, the diffusion length of the cosmic ray electrons in these galaxies.

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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