IR dust bubbles: molecular gas linked to S21, S22 and S23

C.E. CAPPA; J. VASQUEZ; G.A. ROMERO; M. RUBIO

Mar del Plata

Congreso; Reunión 55 de la Asociación Argentina de Astronomía; 2012

Asociación Argentina de Astronomía

Abstract. Based on 12CO(2-1) and 13CO(2-1) line observations ob-tained with the APEX telescope, we investigate the molecular gas dis-tribution in the environs of the infrared dust bubbles S 21, S 22, andS 23 identified by Churchwell et al. (2006). This study allowed us to find molecular shells linked to the bubbles, and to estimate their distances, excitation conditions, masses, and ambient densities. A search for young stellar objets in IR point source catalogs applying specific criteria, revealed active areas of star formation coincident with the molecular envelope.