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arXiv 0906.4938astro-ph.CO
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用SWIRE X射线/70微米源测试星爆/活动星系核连接

Testing the starburst/AGN connection with SWIRE X-ray/70 micron sources

M. Trichas, A. Georgakakis, M. Rowan-Robinson, K. Nandra, D. Clements, M. Vaccari

摘要:

我们探索X射线源的性质与70微米对应物中选择的SWIRE领域ELAIS-N1,洛克曼洞和钱德拉深场南,其中钱德拉X射线数据可用。共选择了28个红移区间为0.5<z<1.3的X射线/70微米源。X射线光度和X射线谱的形状表明这些源是活动星系核。对光学到远红外光谱能量分布的模拟表明,其中大多数(27/28)具有强烈的星暴成分(每年超过50个太阳质量),在红外中占主导地位。结果发现,样品源的X射线和红外光度是广泛相关的,与活动星系核活动和恒星形成之间的联系一致。与活动星系核和星系共同演化的一些模型的预测相反,样品中的X射线/70微米源在X射线波长处并不比总的X射线群更模糊。它还发现,X射线/70微米的源有较低的特定的恒星形成率相比,一般的70微米人口,与活动星系核反馈调节恒星形成的宿主星系。

英文摘要:

We explore the nature of X-ray sources with 70 micron counterparts selected in the SWIRE fields ELAIS-N1, Lockman Hole and Chandra Deep Field South, for which Chandra X-ray data are available. A total of 28 X-ray/70 micron sources in the redshift interval 0.5<z<1.3 are selected. The X-ray luminosities and the shape of the X-ray spectra show that these sources are AGN. Modelling of the optical to far-infrared Spectral Energy Distribution indicates that most of them (27/28) have a strong starburst component (>50 solar masses per year) that dominates in the infrared. It is found that the X-ray and infrared luminosities of the sample sources are broadly correlated, consistent with a link between AGN activity and star-formation. Contrary to the predictions of some models for the co-evolution of AGN and galaxies, the X-ray/70 micron sources in the sample are not more obscured at X-ray wavelengths compared to the overall X-ray population. It is also found that the X-ray/70 micron sources have lower specific star-formation rates compared to the general 70 micron population, consistent with AGN feedback moderating the star-formation in the host galaxies.

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