Commissioning Observations in 2022 with 100-GHz MKID Camera at Nobeyama 45-m Telescope

The observations at the 100 GHz frequency band evaluate thermal dust radiations and free-free emission characteristics of star-formation regions in the Milky Way. In our collaboration, the continuum camera with microwave kinetic inductance detector (MKIDs) is being developed for sub-millimeter astronomy. MKID is a resonator-based superconducting detector having an intrinsic potential to get over 1,000 pixels in one readout line. This large number of pixels can realize high sensitivity and wide sky coverage to observe detailed structures of astronomical objects. The camera with 109 MKID pixels for the 100-GHz frequency band was installed at the Nobeyama 45-m telescope in 2021. After the success of MKID performance evaluation with commissioning planet observations, several observations of star-formation regions (W49 and W51) and a quasar of 3C273 were performed in 2022. This report shows the overview of our instruments installed in the Nobeyama 45-m telescope with their performances and preliminary observational results in 2022.