南山26米射电望远镜Planck早期冷核H₂CO 6 cm吸收线观测数据集

The observations were conducted between October 2022 and December 2024 and include single-pointing observations of all 73 targets, together with mapping observations of four high signal-to-noise core regions.The dataset includes source names, equatorial and Galactic coordinates, H₂CO spectra, central velocities, integrated intensities, peak brightness temperatures, line widths, rms noise levels, and spectral fitting parameters.

For sources with resolved hyperfine structure, excitation temperatures, optical depths, and H₂CO column densities are also provided. Thermal and non-thermal velocity dispersions, sound speeds, and Mach numbers derived using complementary NH₃ kinetic-temperature measurements are included where available.H₂CO absorption was detected in 51 of the 73 sources, corresponding to a detection rate of 69.9%, and 24 sources exhibit resolved hyperfine-structure components.