SCUBA与斯皮策的联系：z<1时的冷Galvanic
The Link Between SCUBA and Spitzer: Cold Galaxies at z<1
摘要：
我们表明，远红外性能的遥远的发光和超铝的红星系（LIRGs和ULIRGs）的平均发散类似的来源在本地宇宙。我们的分析是基于斯皮策MIPS和IRAC数据的L_IR>10^10 L_solar，70 um的选择对象在0.1<z<2红移范围内，并支持与IRAS亮星系样本的比较。在我们的样本中的大多数对象所描述的光谱能量分布（SED）的峰值在较长的波长比本地源的等效总红外光度。SED峰值波长的这种变化意味着从z~0到早期宇宙的尘埃和/或恒星形成特性发生了明显的变化，倾向于降低尘埃温度，这表明冷尘埃“卷云”成分的强烈演化。我们表明，这些对象是潜在的缺失环节之间的充分研究的本地IR发光星系，斯皮策红外人口和SCUBA源-Z <1 counterparts of the cold z>1亚毫米星系（SMG）发现在空白领域的亚毫米调查。赫歇尔空间天文台处于充分研究这些天体性质的有利位置，因为它的覆盖范围覆盖了远红外/亚毫米波段SED的主要部分，具有很宽的红移范围。
英文摘要：
We show that the far-IR properties of distant Luminous and Ultraluminous InfraRed Galaxies (LIRGs and ULIRGs) are on average divergent from analogous sources in the local Universe. Our analysis is based on Spitzer MIPS and IRAC data of L_IR>10^10 L_solar, 70um-selected objects in the 0.1<z<2 redshift range and supported by a comparison with the IRAS Bright Galaxy Sample. The majority of the objects in our sample are described by Spectral Energy Distributions (SEDs) which peak at longer wavelengths than local sources of equivalent total infrared luminosity. This shift in SED peak wavelength implies a noticeable change in the dust and/or star-forming properties from z~0 to the early Universe, tending towards lower dust temperatures, indicative of strong evolution in the cold dust, `cirrus', component. We show that these objects are potentially the missing link between the well-studied local IR-luminous galaxies, Spitzer IR populations and SCUBA sources -- the z<1 counterparts of the cold z>1 SubMillimetre Galaxies (SMGs) discovered in blank-field submillimetre surveys. The Herschel Space Observatory is well placed to fully characterise the nature of these objects, as its coverage extends over a major part of the far-IR/submm SED for a wide redshift range.
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