Spitzer and ISO galaxy counts in the mid-infrared
Spitzer and ISO galaxy counts in the mid-infrared
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斯皮策星系和 ISO 星系在中红外区域计数
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
C. Pearson
中科院分区：
文献类型：
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作者：
C. Pearson
星系源计数，同时适合深中红外调查在24微米和15微米的斯皮策太空望远镜和红外空间天文台（ISO），分别提出了两个唯象模型。该模型是基于星暴和发光红外星系占主导地位的人口。这两种模型都能很好地拟合两个波段的计数，并解释了在斯皮策24微米波段看到的高红移人口，支持了它们是z = 2-3的发光超亮红外星系的假设，即亚毫米星系人口的中红外对应物。源计数的特点是强烈的演化到红移单位，其次是不太激烈的演化到更高的红移。这两个波段的数-红移分布可以很好地用许多中红外特征通过观测窗口的效应来解释。在15 μm的计数中，在一个millijansky附近的急剧上升特别取决于在假设的光谱能量分布中，12 μm附近的中红外特征的分布。
Galaxy source counts that simultaneously fit the deep mid-infrared surveys at 24 microns and 15 microns made by the Spitzer Space Telescope and the Infrared Space Observatory (ISO), respectively, are presented for two phenomenological models. The models are based on starburst and luminous infrared galaxy dominated populations. Both models produce excellent fits to the counts in both wavebands and provide an explanation for the high-redshift population seen in the longer Spitzer 24-micron band supporting the hypothesis that they are luminous-ultraluminous infrared galaxies at z = 2-3, being the mid-infrared counterparts to the submillimetre galaxy population. The source counts are characterized by strong evolution to redshift unity, followed by less drastic evolution to higher redshift. The number-redshift distributions in both wavebands are well explained by the effect of the many mid-infrared features passing through the observation windows. The sharp upturn at around a millijansky in the 15-μm counts in particular depends critically on the distribution of mid-infrared features around 12 μm, in the assumed spectral energy distribution.