SCUBA-2“全天空”巡天的初步研究
A Pilot Study for the SCUBA-2 'All-Sky' Survey
摘要：
我们已经为SCUBA-2“全天空”调查进行了试点研究，SASSy是一个850微米的宽而浅的测绘项目，旨在寻找银河系和河外的稀有物体。进行了两组不同的探索性观察，并用于测试SASSy方法和数据简化管道。第一张是围绕附近星系NGC 2559的0.5乘0.5度的地图。该星系在156 mJy时很容易被发现，但在地图上没有其他令人信服的来源。与其他具有类似波长覆盖范围的星系相比，NGC 2559具有相对温暖的尘埃。第二次观测覆盖W5-E HII区域周围的1平方度。以及地图中的扩散结构，滤波方法能够提取27个信噪比大于6的紧凑源。通过与其他波长的数据匹配，我们可以看到SCUBA-2数据可以用来区分较冷的核心。这些观测结果表明，SASSy项目将能够实现其最初的目标，即探测新的亮源，这将是与其他设施进行后续观测的理想选择。
英文摘要：
We have carried out a pilot study for the SCUBA-2 'All-Sky' Survey, SASSy, a wide and shallow mapping project at 850 microns, designed to find rare objects, both Galactic and extragalactic. Two distinct sets of exploratory observations were undertaken, and used to test the SASSy approach and data reduction pipeline. The first was a 0.5 by 0.5 degrees map around the nearby galaxy NGC 2559. The galaxy was easily detected at 156 mJy, but no other convincing sources are present in the map. Comparison with other galaxies with similar wavelength coverage indicates that NGC 2559 has relatively warm dust. The second observations cover 1 square degree around the W5-E HII region. As well as diffuse structure in the map, a filtering approach was able to extract 27 compact sources with signal-to-noise greater than 6. By matching with data at other wavelengths we can see that the SCUBA-2 data can be used to discriminate the colder cores. Together these observations show that the SASSy project will be able to meet its original goals of detecting new bright sources which will be ideal for follow-up observations with other facilities.
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