We present initial results from the CO survey toward high redshift galaxies using the Nobeyama 45m telescope .
Using the new wide bandwidth spectrometer equipped with a two-beam SIS receiver , we have robust new detections of three high redshift ( z = 1.6 - 3.4 ) submillimeter galaxies ( SXDF 1100.001 , SDP9 , and SDP17 ) , one tentative detection ( SDSS J160705+533558 ) , and one non-detection ( COSMOS-AzTEC1 ) .
The galaxies observed during the commissioning phase are sources with known spectroscopic redshifts from previous optical or from wide-band submm spectroscopy .
The derived molecular gas mass and line widths from Gaussian fits are \sim 10 ^ { 11 } M _ { \odot } and 430 – 530 km s ^ { -1 } , which are consistent with previous CO observations of distant submm galaxies and quasars .
The spectrometer that allows a maximum of 32 GHz instantaneous bandwidth will provide new science capabilities at the Nobeyama 45m telescope , allowing us to determine redshifts of bright submm selected galaxies without any prior redshift information .