A ¹³ CO Survey of Molecular Clouds in Gemini and Auriga

A large-scale survey for molecular clouds in 13CO(J \ 10) was performed toward the Gemini and Auriga regions (170 \ l 196 and [10 b \ 10) with velocity coverages of km [30 \ V LSR \ ]30 s~1 and km s~1 for 170 \ l 188 and 188 \ l 196, respectively, by using the [20 \ V LSR \ ]40 two 4 m millimeter-wave telescopes at Nagoya University. An area of 520 deg2 was covered at an 8@ grid spacing with a beam, and 29,250 positions were observed. Signicant 13CO emission (1.2 K km 2@ .7 s~1 \ 3 p) is detected at 1032 positions, and 139 distinct 13CO clouds are identied. Physical properties such as molecular column density, size, and mass are derived for each cloud. Comparison with known H II regions and other associated visible objects indicates that 98 of the 139 clouds are located at D2 kpc, while the rest lie at kpc. The candidates for protostars are selected from IRAS point sources [ 1 and 141 sources are identied as protostellar candidates associated with the 13CO clouds.