SCORPIO: a deep survey of radio emission from the stellar life-cycle

SCORPIO: a deep survey of radio emission from the stellar life-cycle
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天蝎座：对恒星生命周期无线电发射的深入调查

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发表时间：
2015
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通讯作者：
L. Cerrigone
L. Cerrigone
中科院分区：
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文献类型：
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作者：
G. Umana;C. Trigilio;T. Franzen;R. Norris;P. Leto;A. Ingallinera;C. Buemi;C. Agliozzo;C. Agliozzo;F. Cavallaro;F. Cavallaro;F. Cavallaro;L. Cerrigone

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在恒星演化的各个阶段，在各种各样的恒星物体中都探测到射电发射。然而，我们的大部分知识都来自于对小样本的有针对性的观察，这些观察强烈地偏向于其他波长的特殊光源。为了解决这个问题，我们使用澳大利亚望远镜紧凑型阵列（ATCA）进行了一次1.4 GHz的深度调查，遵循与澳大利亚望远镜大面积调查（ATLAS）项目相同的观测设置，这次选择了一个更适合恒星工作的区域。本文介绍了SCORPIO项目以及中试实验的结果。所获得的均方根约为30 /uJy，角分辨率约为10角秒。仅从试验田就提取了大约600个点状源。其中很小一部分被分类在SIMBAD或NASA/IPAC星系外数据库（NED）中。大约80%的被提取的源被报告在一个被检查的目录中，其中50%似乎属于一个变红的恒星/星系群。如果没有进一步的研究，对河外污染物的评价是非常困难的。对于落在天蝎座场的扩展射电源，已经获得了有趣的结果。已经发现了许多气泡状结构，其中一些被归类为其他波长。然而，对于所有这些来源，我们的项目为我们提供了前所未有的灵敏度和2.1 GHz角分辨率的图像。
Radio emission has been detected in a broad variety of stellar objects from all stages of stellar evolution. However, most of our knowledge originates from targeted observations of small samples, which are strongly biased to sources which are peculiar at other wavelengths. In order to tackle this problem we have conducted a deep 1.4 GHz survey by using the Australian Telescope Compact Array (ATCA), following the same observing setup as that used for the Australia Telescope Large Area Survey (ATLAS) project, this time choosing a region more appropriate for stellar work. In this paper, the SCORPIO project is presented as well as results from the pilot experiment. The achieved rms is about 30 /uJy and the angular resolution ~10 arcsec. About six hundred of point-like sources have been extracted just from the pilot field. A very small percentage of them are classified in SIMBAD or the NASA/IPAC Extragalactic Database (NED). About 80 % of the extracted sources are reported in one of the inspected catalogues and 50 % of them appears to belong to a reddened stellar/galactic population. The evaluation of extragalactic contaminants is very difficult without further investigations. Interesting results have been obtained for extended radio sources that fall in the SCORPIO field. Many bubble-like structures have been found, some of which are classified at other wavelengths. However, for all of these sources, our project has provided us with images of unprecedented sensitivity and angular resolution at 2.1 GHz.