DHIGLS：DRAO H I中间银河系纬度巡天
DHIGLS: DRAO H I Intermediate Galactic Latitude Survey
摘要：
利用DRAO综合望远镜（ST）和绿岸望远镜（GBT）的观测数据，在1'角分辨率下对银河系中纬度七个目标区域的氢电离层气体进行了观测。DHIGLS的数据是最广泛的角分分辨率测量弥漫原子星际介质以外的银河系平面。DRAO ST数据的采集、缩减、校准和镶嵌以及GBT短间距信息的交叉校准和合并。由此产生的DHIGLS产品的高质量使得在低银河柱密度的方向上进行各种新的研究成为可能。我们分析的角度功率谱的地图的综合H I发射（柱密度）从数据立方体几个不同的速度范围。基于幂律拟合功率谱模型，但包括合成光束和噪声在高空间频率的影响，我们发现指数范围从-2.5到-3.0。功率谱图的质心速度为这些组件给出了类似的结果。这些指数被解释为分别代表原子气体的3D密度和3D速度场。我们发现的证据，即使是很小的变化速度在通道地图中的H I结构的戏剧性变化。这种窄线发射在明亮背景射电源的吸收光谱中具有对应物，量化了气体的冷而致密，可以被识别为冷中性介质相。完全缩小的DHIGLS H I数据立方体和其他数据产品可在www.cita.utoronto.ca/DHIGLS上获得。
英文摘要：
Observations of Galactic H I gas for seven targeted regions at intermediate Galactic latitude are presented at 1' angular resolution using data from the DRAO Synthesis Telescope (ST) and the Green Bank Telescope (GBT). The DHIGLS data are the most extensive arcminute resolution measurements of the diffuse atomic interstellar medium beyond those in the Galactic plane. The acquisition, reduction, calibration, and mosaicking of the DRAO ST data and the cross calibration and incorporation of the short-spacing information from the GBT are described. The high quality of the resulting DHIGLS products enables a variety of new studies in directions of low Galactic column density. We analyze the angular power spectra of maps of the integrated H I emission (column density) from the data cubes for several distinct velocity ranges. Fitting power spectrum models based on a power law, but including the effects of the synthesized beam and noise at high spatial frequencies, we find exponents ranging from -2.5 to -3.0.. Power spectra of maps of the centroid velocity for these components give similar results. These exponents are interpreted as being representative of the 3D density and 3D velocity fields of the atomic gas, respectively. We find evidence for dramatic changes in the H I structures in channel maps over even small changes in velocity. This narrow line emission has counterparts in absorption spectra against bright background radio sources, quantifying that the gas is cold and dense and can be identified as the cold neutral medium phase. Fully reduced DHIGLS H I data cubes and other data products are available at www.cita.utoronto.ca/DHIGLS.
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