标题： 银河系成像卷轴画（MWISP）：项目细节及银经25.8度至49.7度的初步结果 显示英文标题

标题： The Milky Way Imaging Scroll Painting (MWISP): Project Details and Initial Results from the Galactic Longitude of 25.8deg to 49.7deg

摘要： 银河系成像卷轴画（MWISP）项目是一个无偏的银河系平面一氧化碳（CO）巡天，使用紫金山天文台的13.7米望远镜对l=-10度至+250度和|b|<5.2度的区域进行映射。 该遗留巡天旨在使用九波束超导光谱阵列接收器（SSAR）系统同时观测12CO、13CO和C18O（J=1-0）线，并使用全采样，瞬时带宽为1 GHz。 在本文中，展示了从l=+25.8度到+49.7度的完成的250平方度数据，网格间距为30"，12CO在通道宽度为0.16 km/s时的典型均方根噪声水平约为0.5 K，而13CO和C18O在0.17 km/s时的典型均方根噪声水平约为0.3 K。 高质量的数据具有中等分辨率（50"）、均匀的灵敏度和高空间动态范围，使我们能够研究由三条CO同位素线追踪的分子云（MCs）的细节。 三个有趣的例子被简要研究，包括由CO发射追踪的VLSR<0 km/s的遥远银河系旋臂，靠近HII区域W40的气泡状致密气体结构，以及垂直于银河系平面的MCs分布。 显示英文摘要

摘要： The Milky Way Imaging Scroll Painting (MWISP) project is an unbiased Galactic plane CO survey for mapping regions of l=-10deg to +250deg and |b|<5.2deg with the 13.7 m telescope of the Purple Mountain Observatory. The legacy survey aims to observe the 12CO, 13CO, and C18O (J=1-0) lines simultaneously with full sampling using the nine-beam Superconducting SpectroScopic Array Receiver (SSAR) system with an instantaneous bandwidth of 1 GHz. In this paper, the completed 250 deg^2 data from l=+25.8deg to +49.7deg are presented with a grid spacing of 30" and a typical rms noise level of ~0.5 K for 12CO at the channel width of 0.16 km/s and ~0.3 K for 13CO and C18O at 0.17 km/s. The high quality data with moderate resolution (50"), uniform sensitivity, and high spatial dynamic range, allow us to investigate the details of molecular clouds (MCs) traced by the three CO isotope lines. Three interesting examples are briefly investigated, including distant Galactic spiral arms traced by CO emission with VLSR<0 km/s, the bubble-like dense gas structure near the HII region W40, and the MCs distribution perpendicular to the Galactic plane.