A first glimpse at the Galactic plane with the ASKAP: the SCORPIO field

A first glimpse at the Galactic plane with the ASKAP: the SCORPIO field
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使用 ASKAP 第一次看到银河平面:天蝎座场

DOI:
10.1093/mnras/stab1279
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发表时间:
2021
影响因子:
4.8
通讯作者:
Umana G
Umana G
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Umana G

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在澳大利亚平方公里阵列探路者(ASKAP)的早期科学阶段和相关调查的准备工作的广泛背景下,我们报告了对银河系平面的第一次无线电观测。选择的目标区域涵盖了整个SCORPIO调查,这是ASKAP计划的宇宙进化图调查的几个探路者项目之一。这些观测于2018年1月进行,中心频率为912 MHz,有15个运行天线,在三个不同的点覆盖总面积约40平方度。最终图像的分辨率为24.1 × 21.1 arcsec2,中位数均方根为。我们能够提取3545个候选源,其中75%是点源。为了初步验证,与843兆赫的莫龙洛银河平面调查的比较。虽然目前的观测结果是在ASKAP仅部分部署的情况下获得的,但它在绘制复杂源(例如居住在银河平面上的源)的独特能力在不同的角度尺度上得到了强调。在天蝎座的视野中,所有以前被归类为射电源的Hiiregions、行星状星云(PNe)和超新星遗迹(SNRs)都被探测到。我们还报告了新的无线电检测从几个Hiiregions以前被分类为“候选人”或“无线电安静”,并从一半的所有PNE在天蝎座字段与强大的分类。最值得注意的是,我们发现了许多未分类的,扩展的来源,构成了一个有前途的候选人Hiregions和信噪比的样本。
In the broad context of the Australian Square Kilometer Array Pathfinder (ASKAP) early-science phase and preparation for the related surveys, we report the first radio observations towards the Galactic plane. The targeted field was chosen to encompass the entire SCORPIO survey, one of the several pathfinder projects for the Evolutionary Map of the Universe survey planned with the ASKAP. The observations were carried out in 2018 January at a central frequency of 912 MHz, with 15 operational antennas, and covered a total area of about 40 square degrees in three different pointings. The final image has a resolution of 24.1 × 21.1 arcsec2and a median rms of. We were able to extract 3545 candidate sources, 75 per cent of them point sources. For a preliminary validation, a comparison with the 843 MHz Molonglo Galactic Plane Survey is presented. Although the present observations were obtained with the ASKAP only partially deployed, its unique capability to map complex sources, such as those inhabiting the Galactic plane, at different angular scales, is highlighted. Within the SCORPIO field all the previously classified Hiiregions, Planetary Nebulae (PNe), and supernovae remnants (SNRs), previously known to be radio sources, were detected. We also report new radio detections from several Hiiregions previously classified as ‘candidates’ or ‘radio quiet’ and from half of all the PNe in the SCORPIO field with robust classification. Most notably, we find numerous unclassified, extended sources which constitute a promising sample of candidates Hiiregions and SNRs.
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