标题： 加拿大-英国深亚毫米波巡天：第一幅亚毫米波图像、源计数和背景的分辨率 显示英文标题

标题： The Canada-UK Deep Submillimetre Survey: First Submillimetre Images, the Source Counts, and Resolution of the Background

摘要： 我们展示了在450和850微米波长进行的深度无偏亚毫米波巡天的初步结果。 我们在850微米波长检测到12个源，给出的源表面密度为850微米通量密度大于2.8mJy的源每平方弧分0.49±0.16。 这些源构成了850微米背景辐射的20-30%，因此是整个由恒星产生的背景辐射的重要组成部分。 这意味着，通过金属丰度与背景辐射之间的联系，可以推断出所有形成过的恒星中相当大一部分是在类似这里检测到的天体中形成的。 它们对背景辐射的巨大贡献以及极端的总辐射光度使这些天体成为原椭圆星系的优秀候选者。 光学天文学家最近表明，宇宙的紫外光度密度在z=0到z=1之间增加了约10倍，然后在更高红移时又减少。 利用对本地宇宙的平行亚毫米波巡天结果，我们表明如果亚毫米波光度密度以类似于紫外光度密度的方式演化，那么亚毫米波源密度和背景都可以得到解释。 因此，如果这些源是正在形成的椭圆星系，它们可能在相对适中的红移下形成。 显示英文摘要

摘要： We present the first results of a deep unbiased submillimetre survey carried out at 450 and 850 microns. We detected 12 sources at 850 microns, giving a surface density of sources with 850-micron flux densities > 2.8mJy of of 0.49+-0.16 per square arcmin. The sources constitute 20-30% of the background radiation at 850 microns and thus a significant fraction of the entire background radiation produced by stars. This implies, through the connection between metallicity and background radiation, that a significant fraction of all the stars that have ever been formed were formed in objects like those detected here. The combination of their large contribution to the background radiation and their extreme bolometric luminosities make these objects excellent candidates for being proto-ellipticals. Optical astronomers have recently shown that the UV-luminosity density of the universe increases by a factor of about 10 between z=0 and z=1 and then decreases again at higher redshifts. Using the results of a parallel submillimetre survey of the local universe, we show that both the submillimetre source density and background can be explained if the submillimetre luminosity density evolves in a similar way to the UV-luminosity density. Thus, if these sources are ellipticals in the process of formation, they may be forming at relatively modest redshifts.