STAR FORMATION IN THE MOLECULAR CLOUD ASSOCIATED WITH THE MONKEY HEAD NEBULA: SEQUENTIAL OR SPONTANEOUS?

摘要: We mapped the (1,1), (2,2), and (3,3) lines of NH3 toward molecular cloud associated with Monkey Head Nebula (MHN) a 1. � 6 angular resolution using Kashima 34 m telescope operated by National Institute Information Communications Technology (NICT). The kinetic temperature gas is 15–30 K in eastern part 30–50 western part. warmer confined to small region close compact Hii S252A. cooler extended over even near region, MHN. made radio continuum observations at 8.4 GHz Yamaguchi 32 telescope. resultant map shows no significant extension from Hα image. This means that less affected MHN, suggesting did not form expanding shock Although spatial distribution Wide-field Infrared Survey Explorer Two Micron All Sky point sources suggests triggered low- intermediate-mass star formation took place locally around S252A, but exciting it should be formed spontaneously cloud.