Detections of Long Carbon Chains CH 3 CCCCH, C 6 H, linear -C 6 H 2 and C 7 H in the Low-Mass Star Forming Region L1527

Abstract

the two states. In the present observations, the Ka = 0 line of para species of l-C6H2 was detected, although the detection was limited for the Ka = 1 line of ortho species so far except for IRC+10216. The column densities of the ortho and para species of l-C6H2 were independently obtained to be 1.3 × 10 11 and 0.6 × 10 11 cm −2 , respectively. C7H was detected for the first time except for IRC+10216. The column density of C7H was estimated to be 6.2 × 10 10 cm −2 from the J = 24.5‒23.5 and 25.5‒24.5 lines. These results of detections would