Multi-scale radio-infrared correlations in M 31 and M 33: The role of magnetic fields and star formation

Multi-scale radio-infrared correlations in M 31 and M 33: The role of magnetic fields and star formation
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M 31 和 M 33 的多尺度射电红外关联:磁场和恒星形成的作用

DOI:
10.1051/0004-6361/201218909
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发表时间:
2013
影响因子:
6.5
通讯作者:
Tabatabaei
Tabatabaei
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Tabatabaei

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星际磁场和宇宙线电子的传播对星系的红外辐射关联有重要影响。当研究星系内不同的空间尺度时,这一点变得很明显。本文研究了两个本星系团星系M31和M33在0.4 ~ 10 kpc空间尺度上20 cm处的红外辐射和自由-自由/同步辐射射电连续辐射之间的相关性。多尺度无线电-红外相关已经进行了使用小波分析。自由和IR发射在所有尺度上都是相关的,但在某些尺度上,同步辐射仅与IR发射轻微相关。在小尺度(<1 kpc)上,M 33的同步辐射-红外相关比M 31强,但在大尺度上,它比M 31弱。以同步辐射-红外关联存在的最小尺度作为宇宙线电子的传播长度,我们证明了小尺度上的差异可以用M 33中比M 31中更小的传播长度来解释。在大尺度上,这种差异是由于M33中的厚盘/晕,而M31中没有。将我们的数据与NGC 6946、LMC和M 51的数据进行比较表明,传播长度由有序磁场与湍流磁场强度之比决定,这与CR电子在ISM中的扩散一致。由于CR电子的扩散长度影响射电-红外关联,这种依赖性是磁场对星系内射电-红外关联重要性的直接观测证据。单位表面积的恒星形成率只间接影响扩散长度,因为它增加了湍流磁场的强度。
Interstellar magnetic fields and the propagation of cosmic ray electrons have an important impact on the radio-infrared (IR) correlation in galaxies. This becomes evident when studying different spatial scales within galaxies. We investigate the correlation between the IR and free-free/synchrotron radio continuum emission at 20 cm from the two local group galaxies M 31 and M 33 on spatial scales between 0.4 and 10 kpc. The multi-scale radio-IR correlations have been carried out using a wavelet analysis. The free-free and IR emission are correlated on all scales, but on some scales the synchrotron emission is only marginally correlated with the IR emission. The synchrotron-IR correlation is stronger in M 33 than in M 31 on small scales (<1 kpc), but it is weaker than in M 31 on larger scales. Taking the smallest scale on which the synchrotron-IR correlation exists as the propagation length of cosmic ray electrons, we show that the difference on small scales can be explained by the smaller propagation length in M 33 than in M 31. On large scales, the difference is due to the thick disk/halo in M 33, which is absent in M 31. A comparison of our data with data on NGC 6946, the LMC and M 51 suggests that the propagation length is determined by the ratio of ordered-to-turbulent magnetic field strength, which is consistent with diffusion of CR electrons in the ISM. As the diffusion length of CR electrons influences the radio-IR correlation, this dependence is a direct observational evidence of the importance of magnetic fields for the radio-IR correlation within galaxies. The star-formation rate per surface area only indirectly influences the diffusion length as it increases the strength of the turbulent magnetic field.
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