Abstract
Abstract We present large-scale molecular line maps of the Central Molecular Zone (CMZ) in our Galaxy obtained with the Nobeyama Radio Observatory 45 m telescope. The observations cover a 3 . ° 5 × 0 . ° 5 region with 20″ resolution in eight molecular lines including SiO J = 2–1, CS J = 2–1, H 13 CN J = 1–0, and HCN J = 1–0. We release the calibrated data cubes and a catalog of SiO-emitting clouds identified by the SCIMES algorithm. For each cloud, we provide cloud-integrated intensities of the observed lines and derive an H 13 CN-based molecular gas mass and a cloud-averaged H 2 number density. We compare SiO intensity ratios with the density, dynamical time, and their product n ¯ H 2 t dyn . We find that SiO intensity ratios relative to six other molecular lines all decrease systematically with increasing n ¯ H 2 t dyn . The tightest correlations are found for SiO/H 13 CN ( r s = −0.82) and SiO/CS ( r s = −0.70). The released data cubes and cloud catalog enable systematic studies of SiO enhancement, shock chemistry, and gas dynamical evolution across the CMZ.