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arXiv 1401.7286astro-ph.GA
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从GALEX看麦哲伦云的紫外线:对LMC源星表的初步观察

The Ultraviolet View of the Magellanic Clouds from GALEX: A First Look at the LMC Source Catalog

Raymond Simons, David Thilker, Luciana Bianchi, Ted Wyder

摘要:

银河演化探测器(GALEX)对麦哲伦云(MC)及其周围地区进行了前所未有的成像调查,包括麦哲伦桥(MB)的近紫外(NUV,1771- 2831 nm)和远紫外(FUV,1344- 1786 nm)波段,分辨率为5”。由于GALEX FUV探测器故障,NUV覆盖的区域比FUV覆盖的区域大得多,特别是在明亮的中心区域。NUV成像的5 $σ$深度在20.8和22.7(ABmag)之间变化。这种成像提供了麦哲伦星系中热星全部内容的第一个敏感视图,揭示了年轻人口的存在,即使在像MB这样恒星形成率表面密度极低的地点,由于紫外线数据对热星的高灵敏度和这些波长的黑暗天空。紫外线源的密度在LMC和SMC的许多区域都相当高。拥挤限制了标准飞行任务管道处理的源探测和光度测定的质量。我们在MC调查区域(来自LMC的$<15^{\circ}$,来自SMC的$<10^{\circ}$)对GALEX数据进行了定制测光。在合并重叠图像中的多个源检测之后,我们为LMC产生的最终目录包含15 $^{\circ}$内的近600万个独特的NUV点源,并在此简要介绍。本文首先介绍了GALEX MC调查,并强调了整个目录和成像数据集将使一些科学调查成为可能。

英文摘要:

The Galaxy Evolution Exporer (GALEX) has performed unprecedented imaging surveys of the Magellanic Clouds (MC) and their surrounding areas including the Magellanic Bridge (MB) in near-UV (NUV, 1771-2831Å) and far-UV (FUV, 1344-1786Å) bands at 5" resolution. Substantially more area was covered in the NUV than FUV, particularly in the bright central regions, because of the GALEX FUV detector failure. The 5$σ$ depth of the NUV imaging varies between 20.8 and 22.7 (ABmag). Such imaging provides the first sensitive view of the entire content of hot stars in the Magellanic System, revealing the presence of young populations even in sites with extremely low star-formation rate surface density like the MB, owing to high sensitivity of the UV data to hot stars and the dark sky at these wavelengths. The density of UV sources is quite high in many areas of the LMC and SMC. Crowding limits the quality of source detection and photometry from the standard mission pipeline processing. We performed custom-photometry of the GALEX data in the MC survey region ($<15^{\circ}$ from the LMC, $<10^{\circ}$ from the SMC). After merging multiple detections of sources in overlapping images, the resulting catalog we have produced for the LMC contains nearly 6 million unique NUV point sources within 15$^{\circ}$ and is briefly presented herein. This paper provides a first look at the GALEX MC survey and highlights some of the science investigations that the entire catalog and imaging dataset will make possible.

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