天鹅座A红外辐射的模拟
Modeling the Infrared Emission from Cygnus A
摘要：
斯皮策太空望远镜提供了一个独特的宇宙红外波长的看法。与以前的飞行任务相比，灵敏度和角分辨率有所提高，从而能够以成像和分光两种方式对天体物理物体进行详细研究。斯皮策对活动星系核的观测有助于揭示这些活动星系核中心区域的物理条件。附近的射电星系天鹅座A是本星系宇宙中最明亮的射电源之一。除了高无线电功率外，它在红外线上也非常明亮。天鹅座A的新斯皮策光谱学和光度学与无线电和亚毫米波长的文献数据相结合。由此产生的并发症建模的组合：同步加速器发射喷流，恒星形成的爆发，并从活动星系核环面发射。在Cyngus A中的红外发射显示了所有三个过程的贡献，并且模型能够在几乎5 dex的频率上再现所观察到的发射。活动星系核的辐射热光度约为10^45 erg s^-1，星团的大小约为7 pc。在中红外线的同步加速器光谱中，可以看到一个断裂的证据。红外辐射的相关成分表明天鹅座A的恒星形成速率约为20 M太阳年^-1。即使没有活动星系核，它仍然是一个明亮的红外源。
英文摘要：
The Spitzer Space Telescope provides a unique view of the Universe at infrared wavelengths. Improved sensitivity and angular resolution over previous missions enable detailed studies of astrophysical objects, both in imaging and spectroscopic modes. Spitzer observations of active galactic nuclei can help shed light on the physical conditions of the central regions of these active glalaxies. The nearby radio galaxy Cygnus A is one of the most luminous radio sources in the local Universe. In addition to the high radio power, it is also very luminous in the infrared. New Spitzer spectroscopy and photometry of Cygnus A is combined with data from the literature at radio and sub-mm wavelengths. The resulting complication is modeled with a combination of: a synchrotron emitting jet, a burst of star formation, and emission from an AGN torus. The infrared emission in Cyngus A shows contributions from all three processes and the models are able to reproduce the observed emission over almost 5 dex in frequency. The bolometric AGN luminosity is found to be ~10^45 erg s^-1, with a clumpy torus size of ~7 pc. Evidence is seen for a break in the synchrotron spectrum in the mid-infrared. The relevant component of the infrared emission suggests Cygnus A has a star formation rate of ~20 M_sun yr^-1. Even in the absence of the AGN, it would still be a luminous infrared source.
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