SUBMILLIMETER-WAVE C Ⅰ SPECTRAL LINES FROM THE NGC 1333 REGION

摘要

We present large (30′ x 40′) maps in the C~0 ~3P_1-~3P_0) ([C Ⅰ]; 492 GHz) and CO J = 3-2 (346 GHz) spectral lines of the NGC 1333 star-forming complex. We also report detections of the C~0 ~3P_2-~3P_1 (809 GHz) spectral line from 3 x 3 positions centered on HH 12. The overall extents of [C Ⅰ] and CO J = 3-2 emission are similar to those of ~(13)CO and C~(18)O J = 1-0 emission. The CO J = 3-2 intensity peak is adjacent to the illuminating star SVS 3, while the [C Ⅰ] intensity peaks at 5′ southwest of the reflection nebula, filling a hollow surrounded by a C-shaped dense molecular shell. We suggest that the observed [C Ⅰ] distributions might be the result of nonequilibrium chemistry on the basis of the time-dependent chemical simulation. A huge expanding H Ⅰ shell associated with the NGC 1333 cloud lends further support to this notion.