论文标题
快速凝视银河系：ii。快速GPP调查的PiggyBack线观测显示，内银盘中的离子气体中的离子气体
Peering into the Milky Way by FAST: II. Ionized gas in the inner Galactic disk revealed by the piggyback line observations of the FAST GPPS survey
论文作者
论文摘要
作为星际介质的主要组成部分之一，在我们的银河系中，尤其是低密度弥散成分的电离气体在无线电带中尚未广泛观察到。银河平面PULSAR快照（GPP）调查涵盖了银河纬度内的天空区域$ \ pm10^\ Circ $周围的银河平面周围的五型仪表孔球形射电望远镜（快速）可见，并且在Pulsar调查观察期间同时记录了光谱线数据。 GPP调查项目的集成时间为5分钟，为1000 $-nα$ 1000 $ -1500 MHz的频带提供了数十台无线电重组线（RRLS）的最敏感的Piggyback Spectra，HE $Nα$，C $Nα$，以及H $nβ$和H $Nβ$和H $Nγ$。我们处理了RRLS的光谱数据，并获得了一个敏感的平均H $Nα$ rrl地图，该地图在33 $^\ circ $ $ $ \ leqslant l \ leqslant l \ leqslant l \ leqslant $ 55 $ 55 $ 55 $ 55 $ 55 $ 55 $ circ $和$ | b | \ leqslant $ 2.0 $^\ circ $。 H $Nα$ RRL的最终频谱数据的空间分辨率为$ \ sim $ 3 $^\ prime $，光谱分辨率为2.2 km s $^{ - 1} $，典型的光谱RMS噪声为0.25 mjy Beam $^{ - 1} $或6.3 Mk的Main-Beam Brightess Prairness Prairtanse温度。新的H $Nα$ RRL图显示了许多HII区域和大型扩展离子化气体区域的复杂结构特征。我们检测到约94％的HII区域，并在观察到的天空区域确认43个明智的HII区域。遥远的外星系中的几个大型HII区域或恒星形成复合物在H $Nα$ RRL的地图中解析。检测到扩散离子气体的扩展RRL特征。 GPPS调查的RRL数据产品将在http://zmtt.bao.ac.cn/milkywaywayfast/上发布和更新
As one of the major components of the interstellar medium, the ionized gas in our Milky Way, especially the low-density diffuse component, has not been extensively observed in the radio band. The Galactic Plane Pulsar Snapshot (GPPS) survey covers the sky area within the Galactic latitude of $\pm10^\circ$ around the Galactic plane visible by the Five-hundred-meter Aperture Spherical radio Telescope (FAST), and the spectral line data are simultaneously recorded during the pulsar survey observations. With an integration time of 5 minutes for each beam, the GPPS survey project provides the most sensitive piggyback spectra for tens of radio recombination lines (RRLs) in the band of 1000$-$1500 MHz for H$nα$, He$nα$, C$nα$, as well as H$nβ$ and H$nγ$. We processed the spectral data of RRLs, and obtained a sensitive averaged H$nα$ RRL map of a sky area of 88 square degrees in the inner Galaxy of 33$^\circ$ $\leqslant l \leqslant$ 55$^\circ$ and $|b| \leqslant$ 2.0$^\circ$. The final spectral data of the H$nα$ RRLs have a spatial resolution of $\sim$3$^\prime$, a spectral resolution of 2.2 km s$^{-1}$, and a typical spectral rms noise of 0.25 mJy beam$^{-1}$ or 6.3 mK in main-beam brightness temperature. The new H$nα$ RRL map shows complex structural features dominated by a number of HII regions and large extended diffuse ionized gas regions. We detect about 94% of the known HII regions and confirm 43 WISE HII regions in the observed sky area. Several large HII regions or star-forming complexes in the distant outer Galaxy are resolved in the map of H$nα$ RRLs. Extended RRL features of the diffuse ionized gas are detected. The RRL data products of the GPPS survey will be published and updated at http://zmtt.bao.ac.cn/MilkyWayFAST/
