论文标题
Mustang-2银河飞机调查（MGPS90）飞行员
The MUSTANG-2 Galactic Plane Survey (MGPS90) pilot
论文作者
论文摘要
我们报告了绿色银行望远镜（GBT）野马银河飞机调查（90 GHz），MGPS90的野马银河飞机调查的结果。该调查获得了典型的$1σ$深度，$ 1-2 $ mjy beam $^{ - 1} $，带有9英寸的光束。我们描述了调查参数，质量评估过程，分类以及与其他数据集的比较。我们已经确定了709个在七个观察到的$ $ 0. $ 0. $ 0. $ 0 $ <0. $ 0. <<<0. $ <0. $ <<<<0.5 $ < / 7.5°^$）在其他波长下，这些来源在这些来源上都可以恢复到其他波长与新调查中的候选者相比，与原始群体W51和W49相比，这是新的HCHII区域的强大候选者。 16-46％的UCHII区域寿命。
We report the results of a pilot program for a Green Bank Telescope (GBT) MUSTANG Galactic Plane survey at 3 mm (90 GHz), MGPS90. The survey achieves a typical $1σ$ depth of $1-2$ mJy beam$^{-1}$ with a 9" beam. We describe the survey parameters, quality assessment process, cataloging, and comparison with other data sets. We have identified 709 sources over seven observed fields selecting some of the most prominent millimeter-bright regions between $0°< \ell < 50°$ (total area $\approx 7.5 °^2$). The majority of these sources have counterparts at other wavelengths. By applying flux selection criteria to these sources, we successfully recovered several known hypercompact HII (HCHII) regions, but did not confirm any new ones. We identify 126 sources that have mm-wavelength counterparts but do not have cm-wavelength counterparts and are therefore candidate HCHII regions; of these, 10 are morphologically compact and are strong candidates for new HCHII regions. Given the limited number of candidates in the extended area in this survey compared to the relatively large numbers seen in protoclusters W51 and W49, it appears that most HCHII regions exist within dense protoclusters. Comparing the counts of HCHII to ultracompact HII (UCHII) regions, we infer the HCHII region lifetime is 16-46% that of the UCHII region lifetime. We additionally separated the 3 mm emission into dust and free-free emission by comparing with archival 870 $μ$m and 20 cm data. In the selected pilot fields, most ($\gtrsim80$%) of the 3 mm emission comes from plasma, either through free-free or synchrotron emission.
