标题： 远红外和射电辐射在尘埃星暴星系中的发射 显示英文标题

标题： Far infrared and Radio emission in dusty starburst galaxies

摘要： 我们通过最近的恒星形成星系模型重新审视了远红外/无线电相关性的本质。我们使用群体综合代码GRASIL（Silva等人，1998年）来模拟红外辐射。至于无线电辐射，我们重新审视了Condon和Yin（1990年）的简单模型。我们发现当同步加速机制主导逆康普顿效应，且电子冷却时间短于超新星率衰减时间时，紧密的远红外/无线电相关性是自然的。观测表明这两种条件在恒星形成星系中都得到了满足。然而，由于无线电非热辐射有延迟，预期在恒星爆发早期阶段（此时无线电热成分占主导）和后恒星爆发阶段（此时大部分非热成分源自质量较小的恒星）都会出现偏差。这种延迟允许以几十兆年的分辨率分析被遮蔽的恒星爆发，这是其他恒星形成指标无法达到的时间分辨率。我们建议结合从远红外/无线电相关性偏差的分析与无线电斜率的分析来获得爆发的特征参数。对一组紧凑型ULIRG样本的分析显示它们是强烈但短暂的恒星爆发，对于这些样本不应应用为恒定恒星形成率设计的常用恒星形成指标。我们还讨论了使用q-无线电斜率图来评估隐藏AGN存在的可能性。模型的一个明确预测是在后恒星爆发阶段会出现明显的无线电过剩，这似乎是富星团核心一类恒星形成星系的典型特征。我们讨论了由于恒星爆发的演化状态导致的相关性偏差如何影响广泛用于高红移源的光度测定红移技术。 显示英文摘要

摘要： We revisit the nature of the FIR/Radio correlation by means of the most recent models for star forming galaxies. We model the IR emission with our population synthesis code, GRASIL (Silva et al. 1998). As for the radio emission, we revisit the simple model of Condon & Yin (1990). We find that a tightFIR/Radio correlation is natural when the synchrotron mechanism dominates over the inverse Compton, and the electrons cooling time is shorter than the fading time of the supernova rate. Observations indicate that both these conditions are met in star forming galaxies. However since the radio non thermal emission is delayed, deviations are expected both in the early phases of a starburst, when the radio thermal component dominates, and in the post-starburst phase, when the bulk of the NT component originates from less massive stars. This delay allows the analysis of obscured starbursts with a time resolution of a few tens of Myrs, unreachable with other star formation indicators. We suggest to complement the analysis of the deviations from the FIR/Radio correlation with the radio slope to obtain characteristic parameters of the burst. The analysis of a sample of compact ULIRGs shows that they are intense but transient starbursts, to which one should not apply usual SF indicators devised for constant SF rates. We also discuss the possibility of using the q- radio slope diagram to asses the presence of obscured AGN. A firm prediction of the models is an apparent radio excess during the post-starburst phase, which seems to be typical of a class of star forming galaxies in rich cluster cores. We discuss how deviations from the correlation, due to the evolutionary status of the starburst, affect the technique of photometric redshift determination widely used for high-z sources.