Canes Venação地区的盲态HI调查
A blind HI survey in the Canes Venatici region
摘要：
我们利用韦斯特博克综合射电望远镜进行了一次盲态HI巡天，对HI质量较小（在10^6 ~ 10^8 Msol之间）的天体进行了清点，并限制了HI质量函数的低质量端。该调查已进行了一部分的体积包含附近的犬Venaeros集团的星系。所调查的区域在天空上覆盖约86平方度的面积，并且速度范围从约-450到约1330 km/s。我们通过应用自动搜索算法在调查中找到70个来源。其中两个探测以前没有编目，但可以根据对第二代数字巡天图像的目视检查，为它们分配一个光学对应物。只有一个HI检测没有光学对应物。这个物体在NGC 4822附近被探测到，并且在以前的HI研究中已经被探测到。在这次调查中，首次在21厘米发射线上探测到19个物体。我们探测到的HI特性的分布证实了我们发现低质量物体的能力。86%的观测到的轮廓宽度小于130 km/s，可以被认为是矮星系候选者。HI通量的测量意味着，这次调查比以往任何盲HI调查深入约10倍。HI质量函数和探测源的光学性质将在以后的论文中讨论。
英文摘要：
We have carried out a blind HI survey using the Westerbork Synthesis Radio Telescope to make an inventory of objects with small HI masses (between 10^6 and 10^8 Msol) and to constrain the low-mass end of the HI mass function. The survey has been conducted in a part of the volume containing the nearby Canes Venatici groups of galaxies. The surveyed region covers an area on the sky of about 86 square degrees and a range in velocity from about -450 to about 1330 km/s. We find 70 sources in the survey by applying an automated searching algorithm. Two of the detections have not been catalogued previously, but they can be assigned an optical counterpart, based on visual inspection of the second generation Digital Sky Survey images. Only one of the HI detections is without an optical counterpart. This object is detected in the vicinity of NGC4822 and it has been already detected in previous HI studies. Nineteen of the objects have been detected for the first time in the 21-cm emission line in this survey. The distribution of the HI properties of our detections confirms our ability to find low mass objects. 86% of the detections have profile widths less than 130 km/s and can be considered dwarf galaxy candidates. The HI fluxes measured imply that this survey goes about 10 times deeper than any previous blind HI survey. The HI mass function and the optical properties of the detected sources will be discussed in future papers.
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