The Milky Way Imaging Scroll Painting (MWISP): Project Details and Initial Results from the Galactic Longitude of 25.8deg to 49.7deg
Yang Su, Ji Yang, Shaobo Zhang, Yan Gong, Hongchi Wang, Xin Zhou, Min, Wang, Zhiwei Chen, Yan Sun, Xuepeng Chen, Ye Xu, and Zhibo Jiang

TL;DR
The MWISP project provides high-quality, large-scale CO survey data of the Galactic plane, revealing detailed molecular cloud structures and Galactic features in the specified longitude range.
Contribution
This paper presents the initial results and data from a comprehensive CO survey of the Galactic plane, offering new insights into molecular cloud structures and Galactic features.
Findings
Detection of distant Galactic spiral arms via CO emission
Identification of bubble-like dense gas near HII region W40
Mapping of molecular cloud distribution perpendicular to the Galactic plane
Abstract
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…
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