Ionized gas, molecules, and dust in Sh2-132

J. VASQUEZ; C.E. CAPPA; S. PINEAULT; N.U. DURONEA

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Año: 2010 vol. 405 p. 1976 - 1988

0035-8711

We analyze the various interstellar components of the \hii\ region Sh2-132. The main stellar source is the double binary system that includes the Wolf-Rayet star WR153ab. We use radio continuum images at 408 and 1420 MHz, and \hi\ 21cm line data taken from the Canadian Galactic Plane Survey, molecular observations of the CO(1-0) line at 115 GHz from  the Five College  Radio Astronomy Observatory,  and available mid and far IR observations obtained with the MSX and IRAS satellites, respectively. Sh2-132 is composed of two shells showing radio continuum counterparts at both frequencies. The emission is thermal in nature. The estimated rms electron density and ionized mass of the nebula  are n_e = 20 cm-3 and M_{HII} = 1500 \msun. The distribution of the CO emission shows molecular gas bordering the ionized nebula and interacting with it. The velocities of the molecular gas is in the range --38 to --53 \kms, similar to the velocity of the ionized gas. The emission at 8.3 $\mu$m reveals a ring like feature of about 15\arcmin\ that encircles the bright optical regions. This emission is due to the PAHs and marks the location of photodissociation regions.The gas distribution in the environs of Sh2-132 can be explained in ascenario where the massive stars in the region photodissociated, ionized, and swept-up the dense molecular material from the parental cloud through their strong stellar winds and intense UV photon flux.