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arXiv 0812.2609astro-ph
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红外和亚毫米计数的新模型

A new model for infrared and submillimetre counts

Michael Rowan-Robinson

摘要:

本文提出了一个适用于8-1100 $μ$ m源计数的新模型,它与源计数数据和观测到的背景谱符合得很好。该模型类似于Rowan-Robinson(2001)的模型,但对于四种假设的红外模板类型中的每一种都有不同的演变。这种演化有两种方式:(i)指数因子被修改,使其在后期趋于恒定值;(ii)幂律因子被修改,使其在红移z_f处趋于零,而不是Rowan-Robinson(2001)假设的0。我从850和1100 μ m的计数以及红外背景中找到了强有力的证据,z_f = 4-5,在这个范围的低端有一些偏好,这意味着z > 5的恒星形成星系不是重要的红外发射体,大概是由于这些早期时期尘埃的不透明度较低。在低红移(<0.2)的情况下,该模型涉及到星暴和活动星系核的零甚至负演化,这表明大合并和强星系-星系相互作用的时代已经结束。

英文摘要:

A new model for source counts from 8-1100 $μ$m is presented, which agrees well with source-count data and the observed background spectrum. The model is similar to that of Rowan-Robinson (2001), but with different evolution for each of the four assumed infrared template types. The evolution is modified in two ways; (i) the exponential factor is modified so that it tends to a constant value at late times, (ii) the power-law factor is modified so that it tends to zero at redshift z_f, rather than 0 as assumed by Rowan-Robinson (2001). I find strong evidence from the 850 and 1100 mum counts, and from the infrared background, that z_f = 4-5, with some preference for a value at the low end of the range, implying that star-forming galaxies at z > 5 are not significant infrared emitters, presumably due to a low opacity in dust at these early epochs. The model involves zero or even negative evolution for starbursts and AGN at low redshifts (<0.2), suggesting that the era of major mergers and strong galaxy-galaxy interactions is over.

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